Plant List

Indexed Alphabetically by Common Name

R-S

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  National Common Name Scientific Name with Author Symbol Family
Rabbit Valley gilia Aliciella caespitosa (Gray) J.M. Porter ALCA23 Polemoniaceae
rabbitbells Crotalaria rotundifolia Walt. ex J.F. Gmel. CRRO5 Fabaceae
rabbitbrush Chrysothamnus Nutt. CHRYS9 Asteraceae
rabbitear rockcress Arabis pendulina Greene ARPE Brassicaceae
rabbitear rockcress Arabis pendulina Greene var. pendulina ARPEP Brassicaceae
rabbithead balsamroot Balsamorhiza hookeri (Hook.) Nutt. var. lagocephala (Sharp) Cronq. BAHOL Asteraceae
rabo de gato Arundinella hispida (Humb. & Bonpl. ex Willd.) Kuntze ARHI10 Poaceae
rabo de gato Arundinella Raddi ARUND3 Poaceae
rabo de ranton Casearia aculeata Jacq. CAAC3 Flacourtiaceae
raceme pussytoes Antennaria racemosa Hook. ANRA Asteraceae
Radford's sedge Carex radfordii Gaddy CARA20 Cyperaceae
radiate fingergrass Chloris radiata (L.) Sw. CHRA Poaceae
ragged rockflower Crossosoma bigelovii S. Wats. CRBI2 Crossosomataceae
ragged rockflower Crossosoma bigelovii S. Wats. var. bigelovii CRBIB Crossosomataceae
ragged rockflower Crossosoma bigelovii S. Wats. var. glaucum (Small) Kearney & Peebles CRBIG Crossosomataceae
ragleaf Crassocephalum Moench CRASS2 Asteraceae
ragleaf bahia Bahia dissecta (Gray) Britt. BADI Asteraceae
ragweed Ambrosia L. AMBRO Asteraceae
ragweed sagebrush Artemisia franserioides Greene ARFR3 Asteraceae
Raiche's clarkia Clarkia concinna (Fisch. & C.A. Mey.) Greene ssp. raichei G. Allen, V. Ford & L. Gottlieb CLCOR Onagraceae
Raiche's manzanita Arctostaphylos stanfordiana Parry ssp. raichei W. Knight ARSTR Ericaceae
railhead milkvetch Astragalus terminalis S. Wats. ASTE9 Fabaceae
railroadfence Bauhinia pauletia Pers. BAPA3 Fabaceae
Rainbow manzanita Arctostaphylos rainbowensis J.E. Keeley & A. Massihi ARRA7 Ericaceae
rainforest spleenwort Asplenium normale D. Don ASNO4 Aspleniaceae
rainlily Cooperia Herbert COOPE Liliaceae
raintree Brunfelsia L. BRUNF2 Solanaceae
rakkyo Allium chinense G. Don ALCH5 Liliaceae
rambai Baccaurea motleyana (Muell. Arg.) Muell. Arg. BAMO4 Euphorbiaceae
Ramensk's sedge Carex ramenskii Komarov CARA4 Cyperaceae
ramon Brosimum alicastrum Sw. ssp. alicastrum BRALA2 Moraceae
Ramona clarkia Clarkia similis Lewis & Ernst CLSI Onagraceae
Ramona spineflower Chorizanthe leptotheca Goodman CHLE6 Polygonaceae
rampion Campanula rapunculus L. CARA19 Campanulaceae
rampion bellflower Campanula rapunculoides L. CARA Campanulaceae
ram's head lady's slipper Cypripedium arietinum Ait. f. CYAR5 Orchidaceae
Ramshaw Meadows sand verbena Abronia alpina Brandeg. ABAL Nyctaginaceae
rape Brassica napus L. BRNA Brassicaceae
rape Brassica napus L. var. napus BRNAN2 Brassicaceae
rape mustard Brassica rapa L. ssp. rapa BRRAR2 Brassicaceae
Rapp's biatorella lichen Biatorella rappii Zahlbr. BIRA3 Biatorellaceae
Rapp's cup lichen Cladonia rappii A. Evans CLRA5 Cladoniaceae
Rapp's shell lichen Arthopyrenia rappii Zahlbr. ARRA6 Arthopyreniaceae
rare loco milkvetch Astragalus leptocarpus Torr. & Gray ASLE10 Fabaceae
rat's ear Commelina forskaolii Vahl COFO3 Commelinaceae
rat-tail cholla Cylindropuntia ×viridiflora (Britt. & Rose) F.M. Knuth (pro sp.) [imbricata × whipplei] CYVI16 Cactaceae
rat-tail orchid Bulbophyllum pachyrrachis (A. Rich.) Griseb. BUPA2 Orchidaceae
rattan Calamus rotang L. CARO32 Arecaceae
Rattan's cryptantha Cryptantha rattanii Greene CRRA3 Boraginaceae
Rattan's milkvetch Astragalus rattanii Gray ASRA4 Fabaceae
Rattan's milkvetch Astragalus rattanii Gray var. rattanii ASRAR3 Fabaceae
Rattan's sandmat Chamaesyce ocellata (Dur. & Hilg.) Millsp. ssp. rattanii (S. Wats.) Koutnik CHOCR Euphorbiaceae
rattlebox Crotalaria alata Buch.-Ham. ex D. Don CRAL12 Fabaceae
rattlebox Crotalaria L. CROTA Fabaceae
rattlebox Crotalaria mysorensis Roth CRMY Fabaceae
rattlebox Crotalaria paulina Schrank CRPA22 Fabaceae
rattlebox Crotalaria vitellina Ker Gawler CRVI13 Fabaceae
rattlesnake brome Bromus briziformis Fisch. & C.A. Mey. BRBR5 Poaceae
rattlesnake fern Botrychium virginianum (L.) Sw. BOVI Ophioglossaceae
rattlesnake flower Brazoria truncata (Benth.) Engelm. & Gray BRTR Lamiaceae
rattlesnake flower Brazoria truncata (Benth.) Engelm. & Gray var. truncata BRTRT2 Lamiaceae
rattlesnake plant Calathea crotalifera S. Wats. CACR19 Marantaceae
rattleweed Crotalaria retusa L. CRRE4 Fabaceae
Raup's Indian paintbrush Castilleja raupii Pennell CARA7 Scrophulariaceae
Ravenel's bruchia moss Bruchia ravenelii Wils in Sull. BRRA5 Bruchiaceae
Ravenel's cryphaea moss Cryphaea ravenelii Aust. CRRA7 Cryphaeaceae
Ravenel's cup lichen Cladonia ravenelii Tuck. CLRA3 Cladoniaceae
Ravenel's dot lichen Arthonia ravenelii Tuck. ARRA5 Arthoniaceae
Ravenel's dotted lichen Bacidia ravenelii (Tuck.) Zahlbr. BARA2 Bacidiaceae
ravenfoot sedge Carex crus-corvi Shuttlw. ex Kunze CACR8 Cyperaceae
Raven's milkvetch Astragalus ravenii Barneby ASRA5 Fabaceae
ravine cyanea Cyanea dunbariae Rock CYDU3 Campanulaceae
ravine midsorus fern Blechnum divergens (Kunze) Mett. BLDI Blechnaceae
ravine sedge Carex impressinervia Bryson, Kral & Manhart CAIM2 Cyperaceae
Rawhide HIll onion Allium tuolumnense (Ownbey & Aase) S. Denison & McNeal ALTU Liliaceae
ray fern Actinostachys pennula (Sw.) Hook. ACPE2 Schizaeaceae
rayless arnica Arnica ×diversifolia Greene (pro sp.) [amplexicaulis or mollis × cordifolia or latifolia] ARDI7 Asteraceae
rayless arnica Arnica discoidea Benth. ARDI6 Asteraceae
rayless goldenhead Acamptopappus sphaerocephalus (Harvey & Gray ex Gray) Gray ACSP Asteraceae
rayless goldenhead Acamptopappus sphaerocephalus (Harvey & Gray ex Gray) Gray var. hirtellus Blake ACSPH Asteraceae
rayless goldenhead Acamptopappus sphaerocephalus (Harvey & Gray ex Gray) Gray var. sphaerocephalus ACSPS2 Asteraceae
rayless goldenrod Bigelowia DC. BIGEL Asteraceae
Raymond's sedge Carex raymondii Calder CARA9 Cyperaceae
Raynolds' sedge Carex raynoldsii Dewey CARA6 Cyperaceae
recurved brotherella moss Brotherella recurvans (Michx.) Fleisch. BRRE3 Sematophyllaceae
recurved bryoerythrophyllum moss Bryoerythrophyllum recurvum (Griff.) Saito BRRE4 Pottiaceae
recurved milkvetch Astragalus recurvus Greene ASRE2 Fabaceae
red alder Alnus rubra Bong. ALRU2 Betulaceae
red amaranth Amaranthus cruentus L. AMCR4 Amaranthaceae
red baneberry Actaea rubra (Ait.) Willd. ACRU2 Ranunculaceae
red baneberry Actaea rubra (Ait.) Willd. ssp. arguta (Nutt.) Hultén ACRUA8 Ranunculaceae
red baneberry Actaea rubra (Ait.) Willd. ssp. rubra ACRUR2 Ranunculaceae
red beadtree Adenanthera pavonina L. ADPA Fabaceae
red besseya Besseya rubra (Dougl. ex Hook.) Rydb. BERU Scrophulariaceae
red bloodwood Corymbia gummifera (Soland. ex Gaertn.) K.D. Hill & L.A. Johnson COGU4 Myrtaceae
red brome Bromus rubens L. BRRU2 Poaceae
red buckeye Aesculus pavia L. AEPA Hippocastanaceae
red buckeye Aesculus pavia L. var. flavescens (Sarg.) Correll AEPAF Hippocastanaceae
red buckeye Aesculus pavia L. var. pavia AEPAP Hippocastanaceae
red bulrush Blysmus rufus (Huds.) Link BLRU Cyperaceae
red columbine Aquilegia canadensis L. AQCA Ranunculaceae
red cryptocarya Cryptocarya rubra (Molina) Skeels CRRU12 Lauraceae
red cyphomeris Cyphomeris gypsophiloides (Mart. & Gal.) Standl. CYGY Nyctaginaceae
red false beardgrass Chrysopogon fulvus (Spreng.) Chiov. CHFU Poaceae
red floripontio Brugmansia sanguinea (Ruiz & Pavon) D. Don BRSA3 Solanaceae
red fruit bearberry Arctostaphylos rubra (Rehd. & Wilson) Fern. ARRU Ericaceae
red ginger Alpinia purpurata (Vieill.) K. Schum. ALPU4 Zingiberaceae
red goosefoot Chenopodium rubrum L. CHRU Chenopodiaceae
red grama Bouteloua trifida Thurb. BOTR2 Poaceae
red grama Bouteloua trifida Thurb. var. burkii (Scribn. ex S. Wats.) Vasey ex L.H. Dewey BOTRB Poaceae
red grama Bouteloua trifida Thurb. var. trifida BOTRT Poaceae
red hawksbeard Crepis rubra L. CRRU9 Asteraceae
red hawthorn Crataegus erythrocarpa Ashe CRER3 Rosaceae
red hickory Carya ovalis (Wangenh.) Sarg. CAOV3 Juglandaceae
red hills soap plant Chlorogalum grandiflorum Hoover CHGR3 Liliaceae
red horse-chestnut Aesculus ×carnea Hayne [hippocastanum × pavia] AECA2 Hippocastanaceae
red manjack Cordia collococca L. COCO5 Boraginaceae
red maple Acer rubrum L. ACRU Aceraceae
red maple Acer rubrum L. var. rubrum ACRUR Aceraceae
red maple Acer rubrum L. var. trilobum Torr. & Gray ex K. Koch ACRUT Aceraceae
red milkweed Asclepias rubra L. ASRU Asclepiadaceae
red moneywort Alysicarpus rugosus (Willd.) DC. ALRU4 Fabaceae
red powderpuff Calliandra haematomma (Bertero ex DC.) Benth. CAHA10 Fabaceae
red pricklypoppy Argemone sanguinea Greene ARSA4 Papaveraceae
red ribbons Clarkia concinna (Fisch. & C.A. Mey.) Greene CLCO Onagraceae
red ribbons Clarkia concinna (Fisch. & C.A. Mey.) Greene ssp. automixa R.N. Bowman CLCOA Onagraceae
red ribbons Clarkia concinna (Fisch. & C.A. Mey.) Greene ssp. concinna CLCOC Onagraceae
red sand verbena Abronia maritima Nutt. ex S. Wats. ABMA2 Nyctaginaceae
red Sierra onion Allium obtusum J.G. Lemmon ALOB Liliaceae
red Sierra onion Allium obtusum J.G. Lemmon var. conspicuum Mortola & McNeal ALOBC Liliaceae
red Sierra onion Allium obtusum J.G. Lemmon var. obtusum ALOBO Liliaceae
red silk cottontree Bombax ceiba L. BOCE2 Bombacaceae
red spiderling Boerhavia diffusa L. BODI3 Nyctaginaceae
red star-thistle Centaurea calcitrapa L. CECA2 Asteraceae
red triangles Centrostegia thurberi Gray ex Benth. CETH3 Polygonaceae
red turtlehead Chelone obliqua L. CHOB3 Scrophulariaceae
red turtlehead Chelone obliqua L. var. obliqua CHOBO Scrophulariaceae
red turtlehead Chelone obliqua L. var. speciosa Pennell & Wherry CHOBS Scrophulariaceae
red valerian Centranthus ruber (L.) DC. CERU2 Valerianaceae
red wattle Acacia silvestris Tindale ACSI5 Fabaceae
red windflower Anemone multifida Poir. var. saxicola Boivin ANMUS Ranunculaceae
redbud Cercis L. CERCI2 Fabaceae
redclay hawthorn Crataegus impar Beadle CRIM6 Rosaceae
redclay suncup Camissonia parryi (S. Wats.) Raven CAPA38 Onagraceae
redflower gum Corymbia ficifolia (F. Muell.) K.D. Hill & L.A. Johnson COFI7 Myrtaceae
redflower ragleaf Crassocephalum crepidioides (Benth.) S. Moore CRCR9 Asteraceae
red-gland spurge Chamaesyce melanadenia (Torr.) Millsp. CHME5 Euphorbiaceae
redgum Corymbia calophylla (Lindl.) K.D. Hill & L.A. Johnson COCA48 Myrtaceae
red-hair cyrtandra Cyrtandra ferripilosa St. John CYFE9 Gesneriaceae
redheart Ceanothus spinosus Nutt. CESP Rhamnaceae
red-hot cat's tail Acalypha hispida Burm. f. ACHI2 Euphorbiaceae
red-leaf wattle Acacia rubida A. Cunn. ACRU11 Fabaceae
redmaids Calandrinia Kunth CALAN Portulacaceae
redosier dogwood Cornus sericea L. COSE16 Cornaceae
redosier dogwood Cornus sericea L. ssp. sericea COSES Cornaceae
redring milkweed Asclepias variegata L. ASVA Asclepiadaceae
redroot amaranth Amaranthus retroflexus L. AMRE Amaranthaceae
redroot cryptantha Cryptantha micrantha (Torr.) I.M. Johnston CRMI Boraginaceae
redroot cryptantha Cryptantha micrantha (Torr.) I.M. Johnston var. lepida (Gray) I.M. Johnston CRMIL2 Boraginaceae
redroot cryptantha Cryptantha micrantha (Torr.) I.M. Johnston var. micrantha CRMIM Boraginaceae
redroot flatsedge Cyperus erythrorhizos Muhl. CYER2 Cyperaceae
redshank Adenostoma sparsifolium Torr. ADSP Rosaceae
redskin onion Allium haematochiton S. Wats. ALHA Liliaceae
redspot clarkia Clarkia speciosa H.F. & M.E. Lewis CLSP Onagraceae
redspot clarkia Clarkia speciosa H.F. & M.E. Lewis ssp. nitens (H.F. & M.E. Lewis) Lewis & Raven CLSPN Onagraceae
redspot clarkia Clarkia speciosa H.F. & M.E. Lewis ssp. polyantha H.F. & M.E. Lewis CLSPP Onagraceae
redspot clarkia Clarkia speciosa H.F. & M.E. Lewis ssp. speciosa CLSPS Onagraceae
redstem Ammannia L. AMMAN Lythraceae
redstem ceanothus Ceanothus sanguineus Pursh CESA Rhamnaceae
redstem springbeauty Claytonia rubra (T.J. Howell) Tidestrom CLRU2 Portulacaceae
redstem springbeauty Claytonia rubra (T.J. Howell) Tidestrom ssp. depressa (Gray) J.M. Miller & K. Chambers CLRUD Portulacaceae
redstem springbeauty Claytonia rubra (T.J. Howell) Tidestrom ssp. rubra CLRUR Portulacaceae
redstem wormwood Artemisia scoparia Waldst. & Kit. ARSC4 Asteraceae
redtop Agrostis gigantea Roth AGGI2 Poaceae
reedgrass Calamagrostis Adans. CALAM Poaceae
Reed's bryum moss Bryum reedii Robins. BRRE5 Bryaceae
reflected grapefern Botrychium echo W.H. Wagner BOEC Ophioglossaceae
reflexed flatsedge Cyperus refractus Engelm. ex Boeckl. CYRE3 Cyperaceae
reflexed sedge Carex retroflexa Muhl. ex Willd. CARE9 Cyperaceae
Refugio manzanita Arctostaphylos refugioensis Gankin ARRE5 Ericaceae
Regel's chickweed Cerastium regelii Ostenf. CERE4 Caryophyllaceae
reindeer lichen Cladina (Nyl.) Nyl. CLADI3 Cladoniaceae
reindeer lichen Cladina arbuscula (Wallr.) Hale & Culb. CLAR60 Cladoniaceae
reindeer lichen Cladina mitis (Sandst.) Hustich CLMI60 Cladoniaceae
reindeer lichen Cladina portentosa (Dufour) Follmann CLPO4 Cladoniaceae
reindeer lichen Cladina stygia (Fr.) Ahti CLST5 Cladoniaceae
reindeer lichen Cladina submitis (A. Evans) Hale & Culb. CLSU6 Cladoniaceae
reindeer lichen Cladina subtenuis (Abbayes) Hale & Culb. CLSU7 Cladoniaceae
reindeer lichen Cladina terrae-novae (Ahti) Hale & Culb. CLTE9 Cladoniaceae
relaxgrass Aegopogon cenchroides Humb. & Bonpl. AECE Poaceae
relaxgrass Aegopogon Humb. & Bonpl. ex Willd. AEGOP2 Poaceae
Remy's cyanea Cyanea remyi Rock CYRE10 Campanulaceae
Remy's sandmat Chamaesyce remyi (Gray ex Boiss.) Croizat & Deg. CHRE3 Euphorbiaceae
Remy's sandmat Chamaesyce remyi (Gray ex Boiss.) Croizat & Deg. var. hanaleiensis (Sherff) O.& I. Deg. CHREH Euphorbiaceae
Remy's sandmat Chamaesyce remyi (Gray ex Boiss.) Croizat & Deg. var. kauaiensis (O. Deg. & Sherff) O.& I. Deg. CHREK Euphorbiaceae
Remy's sandmat Chamaesyce remyi (Gray ex Boiss.) Croizat & Deg. var. remyi CHRER Euphorbiaceae
Rendle's meadow foxtail Alopecurus rendlei Eig ALRE3 Poaceae
rescuegrass Bromus catharticus Vahl BRCA6 Poaceae
resin birch Betula glandulosa Michx. BEGL Betulaceae
resin birch Betula neoalaskana Sarg. BENE4 Betulaceae
resinleaf brickellbush Brickellia baccharidea Gray BRBA2 Asteraceae
resinous snakeroot Ageratina resiniflua (Urban) King & H.E. Robins. AGRE3 Asteraceae
reticulate cetraria lichen Cetraria ericetorum Opiz ssp. reticulata (Rasanen) Karnefelt CEERR Parmeliaceae
Reverchon's hawthorn Crataegus reverchonii Sarg. CRRE3 Rosaceae
rhinoceros cactus Coryphantha echinus (Engelm.) Britt. & Rose COEC Cactaceae
rhizoma peanut Arachis glabrata Benth. [excluded] ARGL18 Fabaceae
rhizoma peanut Arachis hagenbeckii Harms ARHA10 Fabaceae
Rhodes grass Chloris gayana Kunth CHGA2 Poaceae
ribbed cryptantha Cryptantha costata Brandeg. CRCO15 Boraginaceae
ribbed sedge Carex virescens Muhl. ex Willd. CAVI4 Cyperaceae
ribseed sandmat Chamaesyce glyptosperma (Engelm.) Small CHGL13 Euphorbiaceae
ricefield flatsedge Cyperus iria L. CYIR Cyperaceae
ricegrass ×Achnella Barkworth ACHNE Poaceae
Richardson's bittercress Cardamine digitata Richards. CADI9 Brassicaceae
Richardson's brookfoam Boykinia richardsonii (Hook.) Rothrock BORI2 Saxifragaceae
Richardson's calliergon moss Calliergon richardsonii (Mitt.) Kindb. in Warnst. CARI70 Amblystegiaceae
Richardson's needlegrass Achnatherum richardsonii (Link) Barkworth ACRI8 Poaceae
Richardson's sedge Carex richardsonii R. Br. CARI Cyperaceae
richweed Collinsonia canadensis L. COCA4 Lamiaceae
richwoods sedge Carex oligocarpa Schkuhr ex Willd. CAOL2 Cyperaceae
Riddell's dozedaisy Aphanostephus riddellii Torr. & Gray APRI Asteraceae
ridge beggartick Bidens gardneri Baker BIGA Asteraceae
ridge rollandia Cyanea longiflora (Wawra) Lammers, Givnish & Systma CYLO12 Campanulaceae
ridged goosefoot Chenopodium carnosulum Moq. CHCA12 Chenopodiaceae
ridged goosefoot Chenopodium carnosulum Moq. var. patagonicum (Phil.) H.A. Wahl CHCAP Chenopodiaceae
ridgestem false foxglove Agalinis oligophylla Pennell AGOL Scrophulariaceae
rigid aloina moss Aloina rigida (Hedw.) Limpr. ALRI2 Pottiaceae
rigid Indian paintbrush Castilleja rigida Eastw. CARI12 Scrophulariaceae
rigid sedge Carex tetanica Schkuhr CATE6 Cyperaceae
rimmed lichen Aspicilia A. Massal. ASPIC2 Hymeneliaceae
rimmed lichen Aspicilia albopruinosa (Looman) ASAL14 Hymeneliaceae
rimmed lichen Aspicilia alboradiata (H. Magn.) Oksner ASAL15 Hymeneliaceae
rimmed lichen Aspicilia annulata (Lynge) J. W. Thomson ASAN14 Hymeneliaceae
rimmed lichen Aspicilia anseris (Lynge) J. W. Thomson ASAN15 Hymeneliaceae
rimmed lichen Aspicilia caesiocinerea (Nyl. ex Malbr.) Arnold ASCA36 Hymeneliaceae
rimmed lichen Aspicilia caesiopruinosa (H. Magn.) J. W. Thomson ASCA37 Hymeneliaceae
rimmed lichen Aspicilia candida (Anzi) Hue ASCA39 Hymeneliaceae
rimmed lichen Aspicilia cinerea (L.) Korber ASCI9 Hymeneliaceae
rimmed lichen Aspicilia cingulata (Zahlbr.) Oksner ASCI10 Hymeneliaceae
rimmed lichen Aspicilia concinna (J. W. Thomson) ASCO44 Hymeneliaceae
rimmed lichen Aspicilia contigua (Lynge) J. W. Thomson ASCO45 Hymeneliaceae
rimmed lichen Aspicilia disserpens (Zahlbr.) Rasanen ASDI11 Hymeneliaceae
rimmed lichen Aspicilia elevata (Lynge) J. W. Thomson ASEL10 Hymeneliaceae
rimmed lichen Aspicilia fimbriata (H. Magn.) Clauzade & Rondon ASFI6 Hymeneliaceae
rimmed lichen Aspicilia gibbosa (Ach.) Korber ASGI7 Hymeneliaceae
rimmed lichen Aspicilia heteroplaca (Zahlbr.) Oksner ASHE9 Hymeneliaceae
rimmed lichen Aspicilia karelica (H. Magn.) Oksner ASKA4 Hymeneliaceae
rimmed lichen Aspicilia laevata (Ach.) Arnold ASLA18 Hymeneliaceae
rimmed lichen Aspicilia laxula (H. Magn.) Brodo ASLA19 Hymeneliaceae
rimmed lichen Aspicilia leprosescens (Sandst.) Hav. ASLE23 Hymeneliaceae
rimmed lichen Aspicilia limitata (H. Magn.) J. W. Thomson ASLI12 Hymeneliaceae
rimmed lichen Aspicilia mashiginensis (Zahlbr.) Oksner ASMA18 Hymeneliaceae
rimmed lichen Aspicilia mastoidea (Lynge) J. W. Thomson ASMA19 Hymeneliaceae
rimmed lichen Aspicilia narssaquensis (Lynge) J. W. Thomson ASNA6 Hymeneliaceae
rimmed lichen Aspicilia nikrapensis Darbish. ASNI6 Hymeneliaceae
rimmed lichen Aspicilia novae-semliae (Zahlbr.) Oksner ASNO7 Hymeneliaceae
rimmed lichen Aspicilia pergibbosa (H. Magn.) Rasanen ASPE14 Hymeneliaceae
rimmed lichen Aspicilia perradiata (Nyl.) Hue ASPE15 Hymeneliaceae
rimmed lichen Aspicilia pertusa (Lynge) J. W. Thomson ASPE16 Hymeneliaceae
rimmed lichen Aspicilia plicigera (Zahlbr.) Rasanen ASPL60 Hymeneliaceae
rimmed lichen Aspicilia reptans (Looman) Wetmore ASRE12 Hymeneliaceae
rimmed lichen Aspicilia rosulata Korber ASRO7 Hymeneliaceae
rimmed lichen Aspicilia ryrkaipiae (H. Magn.) Oksner ASRY Hymeneliaceae
rimmed lichen Aspicilia sorediza (Lynge) J. W. Thomson ASSO8 Hymeneliaceae
rimmed lichen Aspicilia sublapponica (Zahlbr.) Oksner ASSU19 Hymeneliaceae
rimmed lichen Aspicilia subplicigera (H. Magn.) Oksner ASSU21 Hymeneliaceae
rimmed lichen Aspicilia subradians (Nyl.) Hue ASSU22 Hymeneliaceae
rimmed lichen Aspicilia supertegens Arnold ASSU23 Hymeneliaceae
rimmed lichen Aspicilia tenuis (H. Magn.) ASTE19 Hymeneliaceae
rimmed lichen Aspicilia verrucigera Hue ASVE12 Hymeneliaceae
rimrock milkvetch Astragalus desperatus M.E. Jones ASDE3 Fabaceae
rimrock milkvetch Astragalus desperatus M.E. Jones var. conspectus Barneby ASDEC Fabaceae
rimrock milkvetch Astragalus desperatus M.E. Jones var. desperatus ASDED Fabaceae
rimrock milkvetch Astragalus desperatus M.E. Jones var. petrophilus M.E. Jones ASDEP Fabaceae
Rincon manzanita Arctostaphylos stanfordiana Parry ssp. decumbens (P.V. Wells) P.V. Wells ARSTD4 Ericaceae
Rincon Mountain Indian paintbrush Castilleja austromontana Standl. & Blumer CAAU5 Scrophulariaceae
Rincon Mountain rockcress Arabis tricornuta Rollins ARTR6 Brassicaceae
Rincon Ridge ceanothus Ceanothus confusus J.T. Howell CECO6 Rhamnaceae
ringstem Anulocaulis Standl. ANULO Nyctaginaceae
Rio Abajo spleenwort Asplenium corderoanum Proctor ASCO35 Aspleniaceae
Rio Grande ayenia Ayenia limitaris Cristobal AYLI Sterculiaceae
Rio Grande beebrush Aloysia macrostachya (Torr.) Moldenke ALMA9 Verbenaceae
Rio Grande butterflybush Buddleja sessiliflora Kunth BUSE Buddlejaceae
Rio Grande ragweed Ambrosia cheiranthifolia Gray AMCH2 Asteraceae
Rio Grande sedge Cyperus floribundus (Kük.) Carter & Jones CYFL10 Cyperaceae
Rio Grande stickpea Calliandra conferta Benth. CACO Fabaceae
Rio Grande tickseed Coreopsis nuecensoides E.B. Sm. CONU6 Asteraceae
Rio Loc stickpea Calliandra locoensis R. Garcia & D. Kolterman CALO15 Fabaceae
ripgut brome Bromus diandrus Roth BRDI3 Poaceae
ripgut brome Bromus diandrus Roth ssp. diandrus BRDID2 Poaceae
ripgut brome Bromus diandrus Roth ssp. rigidus (Roth) Lainz BRDIR Poaceae
Ripley's gilia Aliciella ripleyi (Barneby) J.M. Porter ALRI3 Polemoniaceae
Ripley's milkvetch Astragalus ripleyi Barneby ASRI2 Fabaceae
Ripley's springparsley Cymopterus ripleyi Barneby CYRI2 Apiaceae
Ritter's coraldrops Besseya ritteriana (Eastw.) Rydb. BERI Scrophulariaceae
rival lipfern Cheilanthes aemula Maxon CHAE Pteridaceae
river birch Betula nigra L. BENI Betulaceae
river bottlebrush Callistemon sieberi DC. CASI17 Myrtaceae
river hawthorn Crataegus rivularis Nutt. CRRI Rosaceae
river junction hawthorn Crataegus condigna Beadle CRCO32 Rosaceae
river sheoak Casuarina cunninghamiana Miq. CACU8 Casuarinaceae
riverbank sedge Carex stenoptila F.J. Herm. CAST4 Cyperaceae
riverflat hawthorn Crataegus opaca Hook. & Arn. CROP Rosaceae
Riverside spineflower Chorizanthe xanti S. Wats. CHXA2 Polygonaceae
Riverside spineflower Chorizanthe xanti S. Wats. var. leucotheca Goodman CHXAL Polygonaceae
Riverside spineflower Chorizanthe xanti S. Wats. var. xanti CHXAX Polygonaceae
roadside agrimony Agrimonia striata Michx. AGST Rosaceae
roadside bittercress Cardamine debilis D. Don CADE14 Brassicaceae
roadside brome Bromus stamineus Desv. BRST3 Poaceae
roadside croton Croton trinitatis Millsp. CRTR8 Euphorbiaceae
roadside false madwort Berteroa mutabilis (Vent.) DC. BEMU Brassicaceae
roadside flatsedge Cyperus sphacelatus Rottb. CYSP3 Cyperaceae
roadside sandmat Chamaesyce lasiocarpa (Klotzsch) Arthur CHLA9 Euphorbiaceae
roadside windmill grass Chloris sagraeana A. Rich. CHSA3 Poaceae
Roan Mountain false goat's beard Astilbe crenatiloba (Britt.) Small ASCR7 Saxifragaceae
Roan Mountain sedge Carex roanensis F.J. Herm. CARO10 Cyperaceae
Robbins' cup lichen Cladonia robbinsii A. Evans CLRO7 Cladoniaceae
Robbins' milkvetch Astragalus robbinsii (Oakes) Gray ASRO Fabaceae
Robbins' milkvetch Astragalus robbinsii (Oakes) Gray var. alpiniformis (Rydb.) Barneby ex C.L. Hitchc. ASROA Fabaceae
Robbins' milkvetch Astragalus robbinsii (Oakes) Gray var. minor (Hook.) Barneby ASROM Fabaceae
Robbins' milkvetch Astragalus robbinsii (Oakes) Gray var. robbinsii ASROR Fabaceae
Robins' bellflower Campanula robinsiae Small CARO15 Campanulaceae
Robinson's onion Allium robinsonii Henderson ALRO Liliaceae
roble de guayo Bourreria virgata (Sw.) G. Don BOVI2 Boraginaceae
robust saltbush Atriplex robusta H. & M. Stutz & S. Sanderson ATRO4 Chenopodiaceae
robust spineflower Chorizanthe robusta Parry CHRO Polygonaceae
robust spineflower Chorizanthe robusta Parry var. hartwegii (Benth.) Reveal & R. Morgan CHROH Polygonaceae
robust spineflower Chorizanthe robusta Parry var. robusta CHROR Polygonaceae
robust suncup Camissonia robusta Raven CARO13 Onagraceae
robusta coffee Coffea canephora Pierre ex Froehner COCA39 Rubiaceae
Rochester hawthorn Crataegus opulens Sarg. CROP3 Rosaceae
rock clematis Clematis columbiana (Nutt.) Torr. & Gray CLCO2 Ranunculaceae
rock clematis Clematis columbiana (Nutt.) Torr. & Gray var. columbiana CLCOC2 Ranunculaceae
rock clematis Clematis columbiana (Nutt.) Torr. & Gray var. tenuiloba (Gray) J. Pringle CLCOT Ranunculaceae
rock disc lichen Buellia geophila (Florke ex Sommerf.) Lynge BUGE Physciaceae
rock harlequin Corydalis sempervirens (L.) Pers. COSE5 Fumariaceae
rock lily Arthropodium R. Br. ARTHR8 Liliaceae
rock onion Allium macrum S. Wats. ALMA5 Liliaceae
rock sedge Carex saxatilis L. CASA10 Cyperaceae
rock tickseed Coreopsis wrightii (Gray) H.M. Parker COWR3 Asteraceae
rockbank midsorus fern Blechnum lineatum (Sw.) C. Christens. BLLI Blechnaceae
rockbrake Cryptogramma R. Br. CRYPT3 Pteridaceae
rockcress Arabidopsis Heynh. ARABI Brassicaceae
rockcress Arabis L. ARABI2 Brassicaceae
rockdwelling sedge Carex petricosa Dewey CAPE8 Cyperaceae
rockflower Crossosoma Nutt. CROSS2 Crossosomataceae
rockjasmine Androsace L. ANDRO3 Primulaceae
rockledge spleenwort Asplenium ocoense C. Christens. ASOC2 Aspleniaceae
rock-lily Arthropodium cirrhatum (G. Forst.) R. Br. ARCI11 Liliaceae
Rockmart hawthorn Crataegus valida Beadle CRVA3 Rosaceae
rockroot Agdestis clematidea Moc. & Sessé ex DC. AGCL3 Phytolaccaceae
rockrose Cistus L. CISTU Cistaceae
rockspray cotoneaster Cotoneaster horizontalis Dcne. COHO80 Rosaceae
Rocky Mountain beeplant Cleome serrulata Pursh CLSE Capparaceae
Rocky Mountain beggarticks Bidens heterosperma Gray BIHE Asteraceae
Rocky Mountain blue columbine Aquilegia saximontana Rydb. AQSA Ranunculaceae
Rocky Mountain goosefoot Chenopodium salinum Standl. CHSA2 Chenopodiaceae
Rocky Mountain hemlockparsley Conioselinum scopulorum (Gray) Coult. & Rose COSC2 Apiaceae
Rocky Mountain Indian parsley Aletes anisatus (Gray) Theobald & Tseng ALAN3 Apiaceae
Rocky Mountain maple Acer glabrum Torr. ACGL Aceraceae
Rocky Mountain maple Acer glabrum Torr. var. diffusum (Greene) Smiley ACGLD3 Aceraceae
Rocky Mountain maple Acer glabrum Torr. var. glabrum ACGLG2 Aceraceae
Rocky Mountain milkvetch Astragalus scopulorum Porter ASSC7 Fabaceae
Rocky Mountain pussytoes Antennaria media Greene ANME2 Asteraceae
Rocky Mountain sedge Carex saximontana Mackenzie CASA9 Cyperaceae
Rocky Mountain snowlover Chionophila jamesii Benth. CHJA Scrophulariaceae
Rocky Mountain springparsley Cymopterus planosus (Osterhout) Mathias CYPL Apiaceae
Rocky Mountain stickweed Cleomella palmeriana M.E. Jones CLPA3 Capparaceae
Rocky Mountain thistle Cirsium perplexans (Rydb.) Petrak CIPE5 Asteraceae
rocoto Capsicum pubescens Ruiz & Pavón CAPU38 Solanaceae
Roell's brotherella moss Brotherella roellii (Ren. & Card. in Röll) Fleisch. BRRO6 Sematophyllaceae
Roemer's false indigo Amorpha roemeriana Scheele AMRO2 Fabaceae
Rogue River milkvetch Astragalus accidens S. Wats. ASAC Fabaceae
Rogue River milkvetch Astragalus accidens S. Wats. var. accidens ASACA2 Fabaceae
Rolfs' milkweed Asclepias tuberosa L. ssp. rolfsii (Britt. ex Vail) Woods. ASTUR Asclepiadaceae
Rollins' cryptantha Cryptantha rollinsii I.M. Johnston CRRO6 Boraginaceae
Roman chamomile Chamaemelum nobile (L.) All. CHNO3 Asteraceae
Roman wormwood Artemisia pontica L. ARPO4 Asteraceae
Roman-cassie Acacia caven (Molina) Molina ACCA35 Fabaceae
Rome hawthorn Crataegus aemula Beadle CRAE2 Rosaceae
romerillo Bidens alba (L.) DC. BIAL Asteraceae
romerillo Bidens alba (L.) DC. var. radiata (Schultz-Bip.) Ballard ex T.E. Melchert BIALR Asteraceae
Roof's manzanita Arctostaphylos manzanita Parry ssp. roofii (Gankin) P.V. Wells ARMAR Ericaceae
rooibos Aspalathus linearis (Burman f.) R. Dahlgren ASLI14 Fabaceae
Rooseveltweed Baccharis neglecta Britt. BANE2 Asteraceae
roostertree Calotropis procera (Ait.) Ait. f. CAPR Asclepiadaceae
rope dodder Cuscuta glomerata Choisy CUGL3 Cuscutaceae
ropevine clematis Clematis pauciflora Nutt. CLPA2 Ranunculaceae
rosary babybonnets Coursetia glandulosa Gray COGL8 Fabaceae
rosarypea Abrus precatorius L. ABPR3 Fabaceae
rose angelica Angelica roseana Henderson ANRO Apiaceae
Rose crossidium moss Crossidium rosei Williams CRRO13 Pottiaceae
rose glorybower Clerodendrum bungei Steud. CLBU Verbenaceae
rose heath Chaetopappa ericoides (Torr.) Nesom CHER2 Asteraceae
rose rockcress Arabis blepharophylla Hook. & Arn. ARBL Brassicaceae
rose thistle Cirsium andersonii (Gray) Petrak CIAN Asteraceae
rosea Colletia spinosissima J.F. Gmel. COSP14 Rhamnaceae
rosebud orchid Cleistes divaricata (L.) Ames CLDI Orchidaceae
rosebud orchid Cleistes L.C. Rich. ex Lindl. CLEIS Orchidaceae
roseling Callisia Loefl. CALLI4 Commelinaceae
Rose's orange lichen Caloplaca rosei Hasse CARO29 Teloschistaceae
Rose's springparsley Cymopterus rosei (M.E. Jones ex Coult. & Rose) M.E. Jones CYRO3 Apiaceae
rosha grass Cymbopogon martinii (Roxb.) J. F. Watson CYMA15 Poaceae
Ross' bentgrass Agrostis rossiae Vasey AGRO4 Poaceae
Ross' sedge Carex rossii Boott CARO5 Cyperaceae
rosy balsamroot Balsamorhiza rosea A. Nels. & J.F. Macbr. BARO2 Asteraceae
rosy manzanita Arctostaphylos tomentosa (Pursh) Lindl. ssp. rosei (Eastw.) P.V. Wells ARTOR Ericaceae
rosy pussypaws Cistanthe rosea (S. Wats.) Hershkovitz CIRO2 Portulacaceae
rosy pussytoes Antennaria rosea Greene ANRO2 Asteraceae
rosy pussytoes Antennaria rosea Greene ssp. arida (E. Nels.) Bayer ANROA Asteraceae
rosy pussytoes Antennaria rosea Greene ssp. confinis (Greene) Bayer ANROC Asteraceae
rosy pussytoes Antennaria rosea Greene ssp. rosea ANROR Asteraceae
rosy sedge Carex rosea Schkuhr ex Willd. CARO22 Cyperaceae
Rothrock's grama Bouteloua rothrockii Vasey BORO2 Poaceae
Rothrock's knapweed Centaurea rothrockii Greenm. CERO Asteraceae
Rothrock's snakeroot Ageratina rothrockii (Gray) King & H.E. Robins. AGRO5 Asteraceae
Rothrock's thistle Cirsium rothrockii (Gray) Petrak CIRO Asteraceae
Roth's andreaea moss Andreaea rothii Web. & Mohr ANRO7 Andreaeaceae
Roth's andreaea moss Andreaea rothii Web. & Mohr var. papillosa C. Müll. ANROP2 Andreaeaceae
Roth's andreaea moss Andreaea rothii Web. & Mohr var. rothii ANROR2 Andreaeaceae
rotund boesenbergia Boesenbergia rotunda (L.) Mansf. BORO4 Zingiberaceae
Rouge Canyon rockcress Arabis modesta Rollins ARMO Brassicaceae
rough bellflower Campanula scabrella Engelm. CASC6 Campanulaceae
rough bentgrass Agrostis scabra Willd. AGSC5 Poaceae
rough brickellbush Brickellia microphylla (Nutt.) Gray var. scabra Gray BRMIS Asteraceae
rough century plant Agave asperrima Jacobi AGAS3 Agavaceae
rough chervil Chaerophyllum temulum L. CHTE5 Apiaceae
rough cryptantha Cryptantha oblata (M.E. Jones) Payson CROB Boraginaceae
rough eyelashweed Blepharipappus scaber Hook. BLSC Asteraceae
rough eyelashweed Blepharipappus scaber Hook. ssp. laevis (Gray) Keck BLSCL Asteraceae
rough eyelashweed Blepharipappus scaber Hook. ssp. scaber BLSCS Asteraceae
rough flatsedge Cyperus retrofractus (L.) Torr. CYRE4 Cyperaceae
rough hairsedge Bulbostylis hirta (Thunb.) Svens. BUHI Cyperaceae
rough hawksbeard Crepis biennis L. CRBI3 Asteraceae
rough hawthorn Crataegus scabrida Sarg. CRSC80 Rosaceae
rough Indian paintbrush Castilleja scabrida Eastw. CASC19 Scrophulariaceae
rough lemon Citrus jambhiri Lush. CIJA Rutaceae
rough lipfern Cheilanthes horridula Maxon CHHO Pteridaceae
rough maidenhair Adiantum hispidulum Sw. ADHI Pteridaceae
rough pricklypoppy Argemone hispida Gray ARHI4 Papaveraceae
rough sedge Carex muricata L. CAMU7 Cyperaceae
rough star-thistle Centaurea aspera L. CEAS2 Asteraceae
rough strongbark Bourreria radula (Poir.) G. Don BORA2 Boraginaceae
rough thistle Cirsium scabrum (Poir.) Bonnet & Barratte CISC4 Asteraceae
rough tree fern Cyathea australis (R.Br.) Domin CYAU5 Cyatheaceae
roughfruit amaranth Amaranthus tuberculatus (Moq.) Sauer AMTU Amaranthaceae
roughglume bushy bluestem Andropogon glomeratus (Walt.) B.S.P. var. scabriglumis C. Campbell ANGLS Poaceae
roughleaf dogwood Cornus drummondii C.A. Mey. CODR Cornaceae
roughseed cryptantha Cryptantha flavoculata (A. Nels.) Payson CRFL6 Boraginaceae
round cardamom Amomum compactum Sol. ex Maton AMCO12 Zingiberaceae
round copperleaf Acalypha monostachya Cav. ACMO Euphorbiaceae
round sedge Carex rotundata Wahlenb. CARO7 Cyperaceae
roundflower catclaw Acacia roemeriana Scheele ACRO Fabaceae
roundfruit blyxa Blyxa aubertii L.C. Rich. BLAU Hydrocharitaceae
roundfruit sedge Carex globosa Boott CAGL7 Cyperaceae
roundhead Chinese houses Collinsia corymbosa Herder COCO2 Scrophulariaceae
roundleaf brookfoam Boykinia rotundifolia Parry BORO3 Saxifragaceae
roundleaf ceratodon moss Ceratodon purpureus (Hedw.) Brid. var. rotundifolius Berggr. CEPUR Ditrichaceae
roundleaf dogwood Cornus rugosa Lam. CORU Cornaceae
roundleaf hawthorn Crataegus lumaria Ashe CRLU3 Rosaceae
roundleaf orchid Amerorchis rotundifolia (Banks ex Pursh) Hultén AMRO Orchidaceae
roundleaf sensitive pea Chamaecrista rotundifolia (Pers.) Greene CHRO3 Fabaceae
roundleaf serviceberry Amelanchier sanguinea (Pursh) DC. AMSA Rosaceae
roundleaf serviceberry Amelanchier sanguinea (Pursh) DC. var. sanguinea AMSAS Rosaceae
roundspike cryptantha Cryptantha humilis (Gray) Payson CRHU2 Boraginaceae
roundstem false foxglove Agalinis gattingeri (Small) Small AGGA Scrophulariaceae
Roxburgh's cassia Cassia roxburghii DC. CARO33 Fabaceae
royal flatsedge Cyperus elegans L. CYEL Cyperaceae
royal kihifern Adenophorus tripinnatifidus Gaud. ADTR2 Grammitidaceae
royal knight's-spur Consolida regalis S.F. Gray CORE2 Ranunculaceae
royal lipfern Cheilanthes notholaenoides (Desv.) Maxon ex Weatherby CHNO2 Pteridaceae
royal sandmat Chamaesyce dioica (Kunth) Millsp. CHDI5 Euphorbiaceae
royal spleenwort Asplenium insiticium Brack. ASIN11 Aspleniaceae
rubbervine Cryptostegia R. Br. CRYPT6 Asclepiadaceae
ruby chalice clarkia Clarkia rubicunda (Lindl.) H.F. & M.E. Lewis CLRU Onagraceae
rue spleenwort Asplenium rutaceum (Willd.) Mett. ASRU5 Aspleniaceae
ruffled spleenwort Asplenium plenum E. St. John ex Small ASPL10 Aspleniaceae
Rugel's anomodon moss Anomodon rugelii (C. Müll.) Keissl. ANRU5 Anomodontaceae
running rockcress Arabis ?procurrens Waldst. & Kit. ARPR3 Brassicaceae
running serviceberry Amelanchier stolonifera Wieg. AMST80 Rosaceae
Runyon's beehive cactus Coryphantha macromeris (Engelm.) Lem. var. runyonii (Britt. & Rose) L. Benson COMAR2 Cactaceae
Runyon's dodder Cuscuta runyonii Yuncker CURU Cuscutaceae
Runyon's onion Allium runyonii Ownbey ALRU Liliaceae
Rusby's flatsedge Cyperus sphaerolepis Boeckl. CYSP7 Cyperaceae
Rusby's milkvetch Astragalus rusbyi Greene ASRU4 Fabaceae
Rusby's milkweed Asclepias rusbyi (Vail) Woods. ASRU6 Asclepiadaceae
Rusby's sedge Carex vallicola Dewey var. rusbyi (Mackenzie) F.J. Herm. CAVAR Cyperaceae
Rusby's thistle Cirsium rusbyi (Greene) Petrak CIRU2 Asteraceae
rush hairsedge Bulbostylis juncoides (Vahl) Kükenth. BUJU Cyperaceae
rush milkweed Asclepias subulata Dcne. ASSU Asclepiadaceae
rush pussytoes Antennaria luzuloides Torr. & Gray ANLU2 Asteraceae
rush pussytoes Antennaria luzuloides Torr. & Gray ssp. aberrans (E. Nels.) Bayer & Stebbins ANLUA2 Asteraceae
rush pussytoes Antennaria luzuloides Torr. & Gray ssp. luzuloides ANLUL Asteraceae
rush skeletonweed Chondrilla juncea L. CHJU Asteraceae
rushy milkvetch Astragalus lonchocarpus Torr. ASLO3 Fabaceae
russeola rockcress Arabis pendulina Greene var. russeola (Rollins) Rollins ARPER Brassicaceae
russet bushwillow Combretum hereroense Schinz COHE15 Combretaceae
Russian bugseed Corispermum ochotense Ignatov COOC9 Chenopodiaceae
Russian bugseed Corispermum ochotense Ignatov var. ochotense Ignatov [excluded] COOCO Chenopodiaceae
Russian milkvetch Astragalus falcatus Lam. ASFA3 Fabaceae
Russian peashrub Caragana frutex (L.) K. Koch CAFR80 Fabaceae
Russian pigweed Axyris amaranthoides L. AXAM Chenopodiaceae
Russian pigweed Axyris L. AXYRI Chenopodiaceae
rusty hawthorn Crataegus rufula Sarg. CRRU5 Rosaceae
rustyleaf cyanea Cyanea hirtella (Mann) Hbd. CYHI5 Campanulaceae
Ruth's milkweed Asclepias uncialis Greene ssp. ruthiae (Maguire) Kartesz & Gandhi ASUNR Asclepiadaceae
Ruth's sedge Carex ruthii Mackenzie CARU6 Cyperaceae
ruvo kale Brassica ruvo L. H. Bailey BRRU4 Brassicaceae
Rydberg's arnica Arnica rydbergii Greene ARRY Asteraceae
Rydberg's golden columbine Aquilegia chrysantha Gray var. rydbergii Munz AQCHR Ranunculaceae
Rydberg's milkvetch Astragalus perianus Barneby ASPE6 Fabaceae
Rydberg's thistle Cirsium rydbergii Petrak CIRY Asteraceae
rye brome Bromus secalinus L. BRSE Poaceae
rye brome Bromus secalinus L. var. secalinus BRSES Poaceae
ryegrass sedge Carex loliacea L. CALO4 Cyperaceae
sabinon Croton poecilanthus Urban CRPO4 Euphorbiaceae
sacapellote Acourtia microcephala DC. ACMI3 Asteraceae
sacatrapo Caperonia palustris (L.) St.-Hil. CAPA11 Euphorbiaceae
sack saltbush Atriplex saccaria S. Wats. ATSA Chenopodiaceae
Sacramento cryptantha Cryptantha crinita Greene CRCR4 Boraginaceae
Sacramento Mountain Indian paintbrush Castilleja wootonii Standl. CAWO4 Scrophulariaceae
Sacramento Mountain thistle Cirsium vinaceum Woot. & Standl. CIVI4 Asteraceae
Sacramento saltbush Atriplex persistens Stutz & Chu ATPE3 Chenopodiaceae
Sacramento waxydogbane Cycladenia humilis Benth. CYHU Apocynaceae
Sacramento waxydogbane Cycladenia humilis Benth. var. humilis CYHUH Apocynaceae
Sacramento waxydogbane Cycladenia humilis Benth. var. venusta (Eastw.) Woods. ex Munz CYHUV Apocynaceae
sacred garlic pear Crateva religiosa Forster f. CRRE12 Capparaceae
Saddle Mountain bittercress Cardamine pattersonii Henderson CAPA13 Brassicaceae
safflower Carthamus tinctorius L. CATI Asteraceae
sagebrush Artemisia L. ARTEM Asteraceae
sagebrush Indian paintbrush Castilleja lineariiloba (Benth.) Chuang & Heckard CALI20 Scrophulariaceae
sagebrush mariposa lily Calochortus macrocarpus Dougl. CAMA5 Liliaceae
sagebrush mariposa lily Calochortus macrocarpus Dougl. var. macrocarpus CAMAM9 Liliaceae
sagebrush rockcress Arabis cobrensis M.E. Jones ARCO Brassicaceae
sago palm Cycas revoluta Thunb. CYRE11 Cycadaceae
saguaro Carnegiea Britt. & Rose CARNE2 Cactaceae
saguaro Carnegiea gigantea (Engelm.) Britt. & Rose CAGI10 Cactaceae
sakaki Cleyera japonica Thunb. CLJA6 Theaceae
Salinas milkvetch Astragalus macrodon (Hook. & Arn.) Gray ASMA3 Fabaceae
saline saltbush Atriplex subspicata (Nutt.) Rydb. ATSU2 Chenopodiaceae
salmon barberry Berberis aggregata C. K. Schneid. BEAG2 Berberidaceae
Salmon Creek Indian paintbrush Castilleja praeterita Heckard & Bacig. CAPR11 Scrophulariaceae
Salmon River cryptantha Cryptantha salmonensis (A. Nels. & J.F. Macbr.) Payson CRSA6 Boraginaceae
salt sedge Carex hassei Bailey CAHA5 Cyperaceae
saltbush Atriplex halimus L. ATHA3 Chenopodiaceae
saltbush Atriplex L. ATRIP Chenopodiaceae
saltloving goosefoot Chenopodium macrospermum Hook. f. var. halophilum (Phil.) Standl. CHMAH Chenopodiaceae
saltmarsh baccharis Baccharis douglasii DC. BADO Asteraceae
saltmarsh bird's-beak Cordylanthus maritimus Nutt. ex Benth. COMA5 Scrophulariaceae
saltmarsh bird's-beak Cordylanthus maritimus Nutt. ex Benth. ssp. canescens (Gray) Chuang & Heckard COMAC Scrophulariaceae
saltmarsh bird's-beak Cordylanthus maritimus Nutt. ex Benth. ssp. maritimus COMAM3 Scrophulariaceae
saltmarsh dodder Cuscuta salina Engelm. CUSA Cuscutaceae
saltmarsh dodder Cuscuta salina Engelm. var. salina CUSAS Cuscutaceae
saltmarsh false foxglove Agalinis maritima (Raf.) Raf. AGMA3 Scrophulariaceae
saltmarsh false foxglove Agalinis maritima (Raf.) Raf. var. grandiflora (Benth.) Shinners AGMAG Scrophulariaceae
saltmarsh false foxglove Agalinis maritima (Raf.) Raf. var. maritima AGMAM Scrophulariaceae
Salton milkvetch Astragalus crotalariae (Benth.) Gray ASCR5 Fabaceae
saltwater false willow Baccharis angustifolia Michx. BAAN Asteraceae
salty loco milkvetch Astragalus lentiginosus Dougl. ex Hook. var. salinus (T.J. Howell) Barneby ASLES Fabaceae
salvia cistus Cistus salviifolius L. CISA Cistaceae
San Antonio bluestar Amsonia fugatei S.P. McLaughlin AMFU Apocynaceae
San Antonio false foxglove Agalinis homalantha Pennell AGHO4 Scrophulariaceae
San Bartolome Cordia rickseckeri Millsp. CORI Boraginaceae
San Benito onion Allium howellii Eastw. var. sanbenitense (Traub) Ownbey & Aase ALHOS Liliaceae
San Benito spineflower Chorizanthe douglasii Benth. CHDO2 Polygonaceae
San Benito suncup Camissonia benitensis Raven CABE7 Onagraceae
San Benito thorn-mint Acanthomintha obovata Jepson ACOB Lamiaceae
San Benito thorn-mint Acanthomintha obovata Jepson ssp. obovata ACOBO Lamiaceae
San Bernardino milkvetch Astragalus bernardinus M.E. Jones ASBE4 Fabaceae
San Bernardino Mountain onion Allium monticola A. Davids. ALMO3 Liliaceae
San Bernardino Mountains Indian paintbrush Castilleja lasiorhyncha (Gray) Chuang & Heckard CALA69 Scrophulariaceae
San Bernardino spineflower Chorizanthe parryi S. Wats. CHPA9 Polygonaceae
San Bernardino spineflower Chorizanthe parryi S. Wats. var. parryi CHPAP2 Polygonaceae
San Bernardino suncup Camissonia confusa Raven CACO33 Onagraceae
San Bruno Mountain manzanita Arctostaphylos imbricata Eastw. ARIM Ericaceae
San Clemente Island brodiaea Brodiaea kinkiensis Niehaus BRKI Liliaceae
San Clemente Island Indian paintbrush Castilleja grisea Dunkle CAGR21 Scrophulariaceae
San Clemente Island milkvetch Astragalus nevinii Gray ASNE5 Fabaceae
San Diego buckbrush Ceanothus cyaneus Eastw. CECY Rhamnaceae
San Diego burr ragweed Ambrosia chenopodiifolia (Benth.) Payne AMCH5 Asteraceae
San Diego coastalcreeper Aphanisma blitoides Nutt. ex Moq. APBL Chenopodiaceae
San Diego needlegrass Achnatherum diegoense (Swallen) Barkworth ACDI10 Poaceae
San Diego sagewort Artemisia palmeri Gray ARPA15 Asteraceae
San Diego sedge Carex spissa Bailey CASP6 Cyperaceae
San Diego spineflower Chorizanthe orcuttiana Parry CHOR Polygonaceae
San Diego thorn-mint Acanthomintha ilicifolia (Gray) Gray ACIL Lamiaceae
San Diego wild cabbage Caulanthus heterophyllus (Nutt.) Payson CAHE11 Brassicaceae
San Diego wild cabbage Caulanthus heterophyllus (Nutt.) Payson var. heterophyllus CAHEH4 Brassicaceae
San Diego wild cabbage Caulanthus heterophyllus (Nutt.) Payson var. pseudosimulans R. Buck CAHEP Brassicaceae
San Felipe dogweed Adenophyllum porophylloides (Gray) Strother ADPO Asteraceae
San Fernando Valley spineflower Chorizanthe parryi S. Wats. var. fernandina (S. Wats.) Jepson CHPAF Polygonaceae
San Francisco blue eyed Mary Collinsia multicolor Lindl. & Paxton COMU Scrophulariaceae
San Francisco onion Allium peninsulare J.G. Lemmon ex Greene var. franciscanum McNeal & Ownbey ALPEF Liliaceae
San Francisco spineflower Chorizanthe cuspidata S. Wats. CHCU3 Polygonaceae
San Francisco spineflower Chorizanthe cuspidata S. Wats. var. cuspidata CHCUC Polygonaceae
San Francisco spineflower Chorizanthe cuspidata S. Wats. var. villosa (Eastw.) Munz CHCUV Polygonaceae
San Gabriel manzanita Arctostaphylos gabrielensis P.V. Wells ARGA4 Ericaceae
San Joaquin dodder Cuscuta brachycalyx (Yuncker) Yuncker CUBR Cuscutaceae
San Joaquin dodder Cuscuta brachycalyx (Yuncker) Yuncker var. apodanthera (Yuncker) Yuncker CUBRA Cuscutaceae
San Joaquin dodder Cuscuta brachycalyx (Yuncker) Yuncker var. brachycalyx CUBRB Cuscutaceae
San Joaquin milkvetch Astragalus asymmetricus Sheldon ASAS3 Fabaceae
San Joaquin saltbush Atriplex joaquiniana A. Nels. ATJO3 Chenopodiaceae
San Juan gilia Aliciella haydenii (Gray) J.M. Porter ALHA6 Polemoniaceae
San Juan milkvetch Astragalus chuskanus Barneby & Spellenberg ASCH13 Fabaceae
San Luis mariposa lily Calochortus obispoensis J.G. Lemmon CAOB Liliaceae
San Luis Mountain giant hyssop Agastache mearnsii Woot. & Standl. AGME2 Lamiaceae
San Luis Obispo mariposa lily Calochortus simulans (Hoover) Munz CASI7 Liliaceae
San Luis Obispo sedge Carex obispoensis Stacey CAOB2 Cyperaceae
San Luis Obispo spineflower Chorizanthe breweri S. Wats. CHBR2 Polygonaceae
San Mateo thorn-mint Acanthomintha duttonii (Abrams) Jokerst ACDU2 Lamiaceae
San Miguel calamint Clinopodium chandleri (Brandeg.) Cantino & S.J. Wagstaff CLCH5 Lamiaceae
San Miguel milkvetch Astragalus miguelensis Greene ASMI6 Fabaceae
San Obispo milkvetch Astragalus didymocarpus Hook. & Arn. var. obispoensis (Rydb.) Jepson ASDIO Fabaceae
San Pedro River sandmat Chamaesyce trachysperma (Engelm.) Millsp. CHTR3 Euphorbiaceae
San Rafael cryptantha Cryptantha jonesiana (Payson) Payson CRJO2 Boraginaceae
San Rafael milkvetch Astragalus rafaelensis M.E. Jones ASRA3 Fabaceae
Sanborn's onion Allium sanbornii Wood ALSA Liliaceae
Sanborn's onion Allium sanbornii Wood var. sanbornii ALSAS Liliaceae
sand bittercress Cardamine parviflora L. CAPA12 Brassicaceae
sand bittercress Cardamine parviflora L. var. arenicola (Britt.) O.E. Schulz CAPAA2 Brassicaceae
sand bluestem Andropogon hallii Hack. ANHA Poaceae
sand brazos-mint Brazoria arenaria Lundell BRAR Lamiaceae
sand dune thistle Cirsium pitcheri (Torr. ex Eat.) Torr. & Gray CIPI Asteraceae
sand gilia Aliciella leptomeria (Gray) J.M. Porter ALLE7 Polemoniaceae
sand heath Ceratiola ericoides Michx. CEER3 Empetraceae
sand hickory Carya pallida (Ashe) Engl. & Graebn. CAPA24 Juglandaceae
sand leek Allium scorodoprasum L. ALSC3 Liliaceae
sand leek Allium scorodoprasum L. ssp. rotundum (L.) Stearn ALSCR Liliaceae
sand milkweed Asclepias arenaria Torr. ASAR Asclepiadaceae
sand pygmyweed Crassula connata (Ruiz & Pavón) Berger CRCO34 Crassulaceae
sand pygmyweed Crassula connata (Ruiz & Pavón) Berger var. connata CRCOC Crassulaceae
sand pygmyweed Crassula connata (Ruiz & Pavón) Berger var. erectoides Bywater & Wickens CRCOE Crassulaceae
sand pygmyweed Crassula connata (Ruiz & Pavón) Berger var. eremica (Jepson) Bywater & Wickens CRCOE2 Crassulaceae
sand pygmyweed Crassula connata (Ruiz & Pavón) Berger var. subsimplex (S. Wats.) Bywater & Wickens CRCOS Crassulaceae
sand sagebrush Artemisia filifolia Torr. ARFI2 Asteraceae
sand sedge Carex arenaria L. CAAR16 Cyperaceae
sand sedge Carex perdentata S.D. Jones CAPE40 Cyperaceae
sand springbeauty Claytonia arenicola Henderson CLAR3 Portulacaceae
sand verbena Abronia Juss. ABRON Nyctaginaceae
sandaster Corethrogyne DC. CORET Asteraceae
sandbar milkvetch Astragalus endopterus (Barneby) Barneby ASEN3 Fabaceae
sandbur Cenchrus L. CENCH Poaceae
sandcarpet Cardionema ramosissimum (Weinm.) A. Nels. & J.F. Macbr. CARA3 Caryophyllaceae
sanddollar Astrophytum asterias (Zucc.) Lem. ASAS6 Cactaceae
sanddune cryptantha Cryptantha fendleri (Gray) Greene CRFE3 Boraginaceae
sand-dune rockcress Arabis media N. Busch ARME13 Brassicaceae
sanddune sandbur Cenchrus tribuloides L. CETR Poaceae
sanddune sandmat Chamaesyce carunculata (Waterfall) Shinners CHCA30 Euphorbiaceae
sanddune sedge Carex pansa Bailey CAPA16 Cyperaceae
sandhill amaranth Amaranthus arenicola I.M. Johnston AMAR Amaranthaceae
sandhill goosefoot Chenopodium cycloides A. Nels. CHCY Chenopodiaceae
sandhill thistle Cirsium repandum Michx. CIRE2 Asteraceae
sandhills milkvetch Astragalus michauxii (Kuntze) F.J. Herm. ASMI2 Fabaceae
sandmat Chamaesyce S.F. Gray CHAMA15 Euphorbiaceae
sandmat manzanita Arctostaphylos pumila Nutt. ARPU4 Ericaceae
sandparsley Ammoselinum Torr. & Gray AMMOS Apiaceae
sandplain false foxglove Agalinis acuta Pennell AGAC Scrophulariaceae
sandreed Calamovilfa (Gray) Hack. ex Scribn. & Southworth CALAM2 Poaceae
sandscrub ceanothus Ceanothus dentatus Torr. & Gray CEDE Rhamnaceae
Sandstede's reindeer lichen Cladina sandstedei (Abbayes) Ahti CLSA6 Cladoniaceae
sandstone milkvetch Astragalus sesquiflorus S. Wats. ASSE7 Fabaceae
sandweed Athysanus Greene ATHYS Brassicaceae
sandwort Arenaria L. ARENA Caryophyllaceae
sandwort cetraria lichen Cetraria arenaria Karnefelt CEAR7 Parmeliaceae
sandwort orange lichen Caloplaca arenaria (Pers.) Mull. Arg. CAAR35 Teloschistaceae
sandy field hairsedge Bulbostylis stenophylla (Ell.) C.B. Clarke BUST Cyperaceae
sandysoil suncup Camissonia strigulosa (Fisch. & C.A. Mey.) Raven CAST20 Onagraceae
sandywoods chaffhead Carphephorus bellidifolius (Michx.) Torr. & Gray CABE4 Asteraceae
sandywoods sedge Carex dasycarpa Muhl. CADA3 Cyperaceae
sanguinaria Alternanthera ficoidea (L.) Beauv. ALFI8 Amaranthaceae
Sanson's anemone Anemone multifida Poir. var. sansonii Boivin ANMUS3 Ranunculaceae
Santa Barbara ceanothus Ceanothus impressus Trel. CEIM Rhamnaceae
Santa Barbara ceanothus Ceanothus impressus Trel. var. impressus CEIMI Rhamnaceae
Santa Barbara ceanothus Ceanothus impressus Trel. var. nipomensis McMinn CEIMN Rhamnaceae
Santa Barbara milkvetch Astragalus trichopodus (Nutt.) Gray ASTR6 Fabaceae
Santa Barbara milkvetch Astragalus trichopodus (Nutt.) Gray var. lonchus (M.E. Jones) Barneby ASTRL Fabaceae
Santa Barbara milkvetch Astragalus trichopodus (Nutt.) Gray var. phoxus (M.E. Jones) Barneby ASTRP Fabaceae
Santa Barbara milkvetch Astragalus trichopodus (Nutt.) Gray var. trichopodus ASTRT2 Fabaceae
Santa Barbara sedge Carex barbarae Dewey CABA4 Cyperaceae
Santa Barbara spineflower Chorizanthe wheeleri S. Wats. CHWH2 Polygonaceae
Santa Catalina Indian paintbrush Castilleja tenuiflora Benth. CATE14 Scrophulariaceae
Santa Catalina Island manzanita Arctostaphylos catalinae P.V. Wells ARCA21 Ericaceae
Santa Catalina mariposa lily Calochortus catalinae S. Wats. CACA5 Liliaceae
Santa Catalina Mountain centaury Centaurium nudicaule (Engelm.) B.L. Robins. CENU Gentianaceae
Santa Clara thorn-mint Acanthomintha lanceolata Curran ACLA2 Lamiaceae
Santa Cruz beehive cactus Coryphantha recurvata (Engelm.) Britt. & Rose CORE3 Cactaceae
Santa Cruz Island cypress Cupressus abramsiana C.B. Wolf CUAB Cupressaceae
Santa Cruz Island hollyfern Arachniodes insularis W.H. Wagner ARIN22 Dryopteridaceae
Santa Cruz Island manzanita Arctostaphylos tomentosa (Pursh) Lindl. ssp. subcordata (Eastw.) P.V. Wells ARTOS Ericaceae
Santa Cruz Island suncup Camissonia hirtella (Greene) Raven CAHI13 Onagraceae
Santa Cruz manzanita Arctostaphylos andersonii Gray ARAN2 Ericaceae
Santa Cruz sedge Carex saliniformis Mackenzie CASA6 Cyperaceae
Santa Fe milkvetch Astragalus feensis M.E. Jones ASFE2 Fabaceae
Santa Lucia manzanita Arctostaphylos luciana P.V. Wells ARLU4 Ericaceae
Santa Lucia suncup Camissonia luciae Raven CALU13 Onagraceae
Santa Rita Mountain dodder Cuscuta odontolepis Engelm. CUOD Cuscutaceae
Santa Rita Mountain grama Bouteloua eludens Griffiths BOEL Poaceae
Santa Rita mountain yellowshow Amoreuxia gonzalezii Sprague & Riley AMGO Bixaceae
Santa Rita snakeroot Ageratina paupercula (Gray) King & H.E. Robins. AGPA13 Asteraceae
Santa Rita threeawn Aristida californica Thurb. ex S. Wats. var. glabrata Vasey ARCAG Poaceae
Santa Rosa Island manzanita Arctostaphylos confertiflora Eastw. ARCO13 Ericaceae
Santo Domingo false willow Baccharis myrsinites (Lam.) Pers. BAMY Asteraceae
Santolina pincushion Chaenactis santolinoides Greene CHSA Asteraceae
santonica Artemisia cina O. Berg & C. F. Schmidt ARCI8 Asteraceae
sapote Casimiroa Llave & Lex. CASIM Rutaceae
sappanwood Caesalpinia sappan L. CASA28 Fabaceae
Sargent's barberry Berberis sargentiana C. K. Snied. BESA6 Berberidaceae
Sargent's cypress Cupressus sargentii Jepson CUSA3 Cupressaceae
Sargent's hawthorn Crataegus sargentii Beadle CRSA3 Rosaceae
Sartwell's sedge Carex sartwellii Dewey CASA8 Cyperaceae
Sartwell's sedge Carex sartwellii Dewey var. sartwellii CASAS5 Cyperaceae
Sartwell's sedge Carex sartwellii Dewey var. stenorrhyncha F.J. Herm. CASAS6 Cyperaceae
Sasanqua camellia Camellia sasanqua Thunb. CASA26 Theaceae
Saskatoon serviceberry Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer AMAL2 Rosaceae
Saskatoon serviceberry Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer var. alnifolia AMALA Rosaceae
Saskatoon serviceberry Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer var. humptulipensis (G.N. Jones) C.L. Hitchc. AMALH Rosaceae
Saskatoon serviceberry Amelanchier alnifolia (Nutt.) Nutt. ex M. Roemer var. semiintegrifolia (Hook.) C.L. Hitchc. AMALS Rosaceae
satincurls Clematis catesbyana Pursh CLCA3 Ranunculaceae
satinleaf Chrysophyllum oliviforme L. CHOL Sapotaceae
satiny milkvetch Astragalus magdalenae Greene ASMA4 Fabaceae
saucerflower Antiphytum DC. & Meisn. ANTIP Boraginaceae
saucer-plant Aeonium undulatum Webb & Berth. AEUN Crassulaceae
savannah milkweed Asclepias pedicellata Walt. ASPE8 Asclepiadaceae
sawgrass Cladium P. Br. CLADI Cyperaceae
sawtooth hawthorn Crataegus viburnifolia Sarg. CRVI Rosaceae
sawtooth sandmat Chamaesyce serrula (Engelm.) Woot. & Standl. CHSE7 Euphorbiaceae
sawtooth wormwood Artemisia serrata Nutt. ARSE4 Asteraceae
scabland sagebrush Artemisia rigida (Nutt.) Gray ARRI2 Asteraceae
scaldweed Cuscuta gronovii Willd. ex J.A. Schultes CUGR Cuscutaceae
scaldweed Cuscuta gronovii Willd. ex J.A. Schultes var. calyptrata Engelm. CUGRC Cuscutaceae
scaldweed Cuscuta gronovii Willd. ex J.A. Schultes var. gronovii CUGRG Cuscutaceae
scalebud Anisocoma acaulis Torr. & Gray ANAC Asteraceae
scaleflower dodder Cuscuta squamata Engelm. CUSQ Cuscutaceae
scaleleaf false foxglove Agalinis aphylla (Nutt.) Raf. AGAP3 Scrophulariaceae
scalloped laceleaf Anthurium crenatum (L.) Kunth ANCR3 Araceae
scalloped moonwort Botrychium crenulatum W.H. Wagner BOCR Ophioglossaceae
Scamman's springbeauty Claytonia scammaniana Hultén CLSC Portulacaceae
scammony Convolvulus scammonia L. COSC10 Convolvulaceae
scareweed Baptisia simplicifolia Croom BASI Fabaceae
scarlet begonia Begonia coccinea Hook. BECO Begoniaceae
scarlet bottlebrush Callistemon rugulosus (D. F. K. Schltdl. ex Link) DC. CARU24 Myrtaceae
scarlet calamint Clinopodium coccineum (Nutt. ex Hook.) Kuntze CLCO10 Lamiaceae
scarlet hawthorn Crataegus pedicellata Sarg. CRPE Rosaceae
scarlet Indian paintbrush Castilleja coccinea (L.) Spreng. CACO17 Scrophulariaceae
scarlet leather flower Clematis texensis Buckl. CLTE2 Ranunculaceae
scarlet milkvetch Astragalus coccineus Brandeg. ASCO6 Fabaceae
scarlet pimpernel Anagallis arvensis L. ANAR Primulaceae
scarlet pimpernel Anagallis arvensis L. ssp. arvensis ANARA7 Primulaceae
scarlet spiderling Boerhavia coccinea P. Mill. BOCO Nyctaginaceae
scented croton Croton suaveolens Torr. CRSU7 Euphorbiaceae
scented cryptantha Cryptantha utahensis (Gray) Greene CRUT Boraginaceae
scented pussytoes Antennaria aromatica Evert ANAR10 Asteraceae
Schaerer's disc lichen Buellia schaereri De Not. BUSC3 Physciaceae
Schaerer's orange lichen Caloplaca schaereri (Florke) Zahlbr. CASC24 Teloschistaceae
Schaffner's bahia Bahia schaffneri S. Wats. BASC4 Asteraceae
Schaffner's hairsedge Bulbostylis schaffneri (Boeckl.) C.B. Clarke BUSC2 Cyperaceae
Schaffner's wattle Acacia schaffneri (S. Wats.) F.J. Herm. ACSC2 Fabaceae
Schaffner's wattle Acacia schaffneri (S. Wats.) F.J. Herm. var. bravoensis Isely ACSCB Fabaceae
Schaffner's wattle Acacia schaffneri (S. Wats.) F.J. Herm. var. schaffneri (S. Wats.) F.J. Herm. [excluded] ACSCS2 Fabaceae
Scheer's beehive cactus Coryphantha robustispina (Schott ex Engelm.) Britt. & Rose ssp. scheeri (Muehlenpfordt) N.P. Taylor COROS Cactaceae
Scheer's beehive cactus Coryphantha robustispina (Schott ex Engelm.) Britt. & Rose ssp. uncinata (L. Benson) N.P. Taylor COROU Cactaceae
Schiede's sedge Carex muriculata F.J. Herm. CAMU8 Cyperaceae
Schimper's acaulon moss Acaulon schimperianum (Sull.) Sull. in Sull. & Lesq. ACSC8 Pottiaceae
Schimper's campylopus moss Campylopus schimperi Milde CASC70 Dicranaceae
schist cynodontium moss Cynodontium schisti (Web. & Mohr) Lindb. CYSC9 Dicranaceae
Schleicher's bryum moss Bryum schleicheri Schwaegr. BRSC7 Bryaceae
Schleicher's cracked lichen Acarospora schleicheri (Ach.) A. Massal. ACSC5 Acarosporaceae
Schmoll's milkvetch Astragalus schmolliae C.L. Porter ASSC5 Fabaceae
Schofield's andreaea moss Andreaea schofieldiana B. Murr. ANSC11 Andreaeaceae
Schofield's ctenidium moss Ctenidium schofieldii Nish. CTSC Hypnaceae
Scholander's asahinea lichen Asahinea scholanderi (Llano) Culb. & C. Culb. ASSC60 Parmeliaceae
Schott's century plant Agave schottii Engelm. AGSC3 Agavaceae
Schott's century plant Agave schottii Engelm. var. schottii AGSCS2 Agavaceae
Schott's sedge Carex schottii Dewey CASC8 Cyperaceae
Schott's wattle Acacia schottii Torr. ACSC Fabaceae
Schreiber's manzanita Arctostaphylos glutinosa Schreib. ARGL5 Ericaceae
Schuette's hawthorn Crataegus schuettei Ashe CRSC4 Rosaceae
Schwarz's campylopus moss Campylopus schwarzii Schimp. CASC29 Dicranaceae
Schweinfurth's olive Canarium schweinfurthii Engler CASC28 Burseraceae
Schweinitz's dotted lichen Bacidia schweinitzii (Fr. ex E. Michener) A. Schneider BASC2 Bacidiaceae
Schweinitz's flatsedge Cyperus schweinitzii Torr. CYSC3 Cyperaceae
Schweinitz's sedge Carex schweinitzii Dewey ex Schwein. CASC9 Cyperaceae
Schwerin's false indigo Amorpha schwerinii Schneid. AMSC2 Fabaceae
scorpion milkvetch Astragalus lentiginosus Dougl. ex Hook. var. scorpionis M.E. Jones ASLES2 Fabaceae
scorpion senna Coronilla emerus L. COEM3 Fabaceae
scorpionbush Carmona Cav. CARMO Boraginaceae
scorpionbush Carmona retusa (Vahl) Masamune CARE22 Boraginaceae
Scotch attorney Clusia rosea Jacq. CLRO Clusiaceae
Scotland orache Atriplex glabriuscula Edmondston ATGL Chenopodiaceae
Scott's clematis Clematis hirsutissima Pursh var. scottii (Porter) Erickson CLHIS Ranunculaceae
Scouler's fumewort Corydalis scouleri Hook. COSC4 Fumariaceae
scrabrous black sedge Carex atratiformis Britt. CAAT6 Cyperaceae
scrambled eggs Corydalis aurea Willd. COAU2 Fumariaceae
Scranton hawthorn Crataegus putata Sarg. CRPU14 Rosaceae
scratchdaisy Croptilon Raf. CROPT Asteraceae
screw-pod wattle Acacia implexa Benth. ACIM5 Fabaceae
screwstem Bartonia Muhl. ex Willd. BARTO Gentianaceae
Scribner needlegrass Achnatherum scribneri (Vasey) Barkworth ACSC11 Poaceae
scrub hickory Carya floridana Sarg. CAFL6 Juglandaceae
scrub she-oak Allocasuarina paludosa (Sieber ex Spreng.) L. A. S. Johnson ALPA23 Casuarinaceae
scrubland goldenaster Chrysopsis subulata Small CHSU6 Asteraceae
scurfpea Cullen Medik. CULLE Fabaceae
s-curve threeawn Aristida ramosissima Engelm. ex Gray ARRA2 Poaceae
scurvygrass Cochlearia L. COCHL4 Brassicaceae
scytheleaf onion Allium falcifolium Hook. & Arn. ALFA3 Liliaceae
sea dahlia Coreopsis maritima (Nutt.) Hook. f. COMA10 Asteraceae
sea fig Carpobrotus chilensis (Molina) N.E. Br. CACH38 Aizoaceae
sea kale Crambe maritima L. CRMA Brassicaceae
sea putat Barringtonia asiatica (L.) Kurz BAAS3 Lecythidaceae
sea rosemary Argusia Boehmer ARGUS Boraginaceae
sea rosemary Argusia gnaphalodes (L.) Heine ARGN2 Boraginaceae
sea sedge Carex marina Dewey CAMA34 Cyperaceae
sea sedge Carex marina Dewey ssp. marina CAMAM16 Cyperaceae
sea torchwood Amyris elemifera L. AMEL Rutaceae
sea wormwood Artemisia maritima L. ARMA27 Asteraceae
seacliff beggarticks Bidens hillebrandiana (Drake) O. Deg. BIHI Asteraceae
seacliff beggarticks Bidens hillebrandiana (Drake) O. Deg. ssp. hillebrandiana BIHIH Asteraceae
seacliff beggarticks Bidens hillebrandiana (Drake) O. Deg. ssp. polycephala Nagata & Ganders BIHIP Asteraceae
seacoast angelica Angelica lucida L. ANLU Apiaceae
sea-fern grass Catapodium marinum (L.) C. E. Hubb. CAMA54 Poaceae
seagrape Coccoloba uvifera (L.) L. COUV Polygonaceae
seaport goosefoot Chenopodium opulifolium Schrad. ex Koch & Ziz CHOP Chenopodiaceae
searocket Cakile P. Mill. CAKIL Brassicaceae
Sears' goatgrass Aegilops searsii M. Feldman & M. Kislev AESE3 Poaceae
seashore bentgrass Agrostis pallens Trin. AGPA8 Poaceae
seashore false bindweed Calystegia soldanella (L.) R. Br. CASO2 Convolvulaceae
seashore saltbush Atriplex drymarioides Standl. ATDR Chenopodiaceae
seaside alder Alnus maritima (Marsh.) Muhl. ex Nutt. ALMA7 Betulaceae
seaside amaranth Amaranthus pumilus Raf. AMPU2 Amaranthaceae
seaside bird's beak Cordylanthus rigidus (Benth.) Jepson ssp. littoralis (Ferris) Chuang & Heckard CORIL Scrophulariaceae
seaside bittercress Cardamine angulata Hook. CAAN5 Brassicaceae
seaside brome Bromus maritimus (Piper) A.S. Hitchc. BRMA5 Poaceae
seaside coccotrema lichen Coccotrema maritimum Brodo COMA15 Coccotremataceae
seaside disc lichen Buellia maritima (A. Massal.) Bagl. BUMA3 Physciaceae
seaside joyweed Alternanthera maritima (Mart.) St.-Hil. ALMA10 Amaranthaceae
seaside petunia Calibrachoa parviflora (Juss.) D'Arcy CAPA47 Solanaceae
seaside pussypaws Cistanthe maritima (Nutt.) Hershkovitz CIMA4 Portulacaceae
seaside sandmat Chamaesyce polygonifolia (L.) Small CHPO6 Euphorbiaceae
seaside tansy Borrichia Adans. BORRI Asteraceae
seaside threeawn Aristida tuberculosa Nutt. ARTU Poaceae
seasonvine Cissus verticillata (L.) D.H. Nicols. & Jarvis CIVE3 Vitaceae
second rockcress Arabis holboellii Hornem. var. retrofracta (Graham) Rydb. ARHOR Brassicaceae
sedge Abildgaardia Vahl ABILD Cyperaceae
sedge Carex L. CAREX Cyperaceae
sedge Carex sonomensis Stacey CASO10 Cyperaceae
sedgeleaf buckbrush Ceanothus cuneatus (Hook.) Nutt. var. fascicularis (McMinn) Hoover CECUF2 Rhamnaceae
seep arnica Arnica lonchophylla Greene ssp. arnoglossa (Greene) Maguire ARLOA Asteraceae
sego lily Calochortus nuttallii Torr. & Gray CANU3 Liliaceae
Seifriz's chamaedorea Chamaedorea seifrizii Burret CHSE17 Arecaceae
Selby's rockcress Arabis selbyi Rydb. ARSE Brassicaceae
Selway mariposa lily Calochortus elegans Pursh var. selwayensis (St. John) Ownbey CAELS Liliaceae
Selwyn's atrichum moss Atrichum selwynii Aust. ATSE3 Polytrichaceae
semaphore pricklypear Consolea corallicola Small COCO14 Cactaceae
Seminole false foxglove Agalinis filifolia (Nutt.) Raf. AGFI2 Scrophulariaceae
Senegal boscia Boscia senegalensis (Pers.) Lam. ex Poiret BOSE4 Capparaceae
sensitive jointvetch Aeschynomene sensitiva Sw. AESE2 Fabaceae
sensitive jointvetch Aeschynomene sensitiva Sw. var. hispidula (Kunth) Rudd [excluded] AESEH Fabaceae
sensitive jointvetch Aeschynomene sensitiva Sw. var. sensitiva AESES Fabaceae
sensitive partridge pea Chamaecrista nictitans (L.) Moench CHNI2 Fabaceae
sensitive partridge pea Chamaecrista nictitans (L.) Moench ssp. nictitans CHNIN Fabaceae
sensitive partridge pea Chamaecrista nictitans (L.) Moench ssp. nictitans var. aspera (Muhl. ex Ell.) Irwin & Barneby CHNIA Fabaceae
sensitive partridge pea Chamaecrista nictitans (L.) Moench ssp. nictitans var. diffusa (DC.) Irwin & Barneby CHNID Fabaceae
sensitive partridge pea Chamaecrista nictitans (L.) Moench ssp. nictitans var. leptadenia (Greenm.) Gandhi & Hatch CHNIL Fabaceae
sensitive partridge pea Chamaecrista nictitans (L.) Moench ssp. nictitans var. nictitans CHNIN2 Fabaceae
sensitive partridge pea Chamaecrista nictitans (L.) Moench ssp. patellaria (DC. ex Colladon) Irwin & Barneby CHNIP Fabaceae
sensitive partridge pea Chamaecrista nictitans (L.) Moench ssp. patellaria (DC. ex Colladon) Irwin & Barneby var. glabrata (Vogel) Irwin & Barneby CHNIG Fabaceae
sensitive partridge pea Chamaecrista nictitans (L.) Moench ssp. patellaria (DC. ex Colladon) Irwin & Barneby var. patellaria (DC. ex Colladon) Kartesz & Gandhi CHNIP2 Fabaceae
sensitive pea Chamaecrista (L.) Moench CHAMA17 Fabaceae
sentry milkvetch Astragalus cremnophylax Barneby ASCR3 Fabaceae
sentry milkvetch Astragalus cremnophylax Barneby var. cremnophylax ASCRC4 Fabaceae
sentry milkvetch Astragalus cremnophylax Barneby var. hevronii Barneby ASCRH Fabaceae
sentry milkvetch Astragalus cremnophylax Barneby var. myriorrhaphis Barneby ASCRM Fabaceae
separated sedge Carex divisa Huds. CADI8 Cyperaceae
serkkom Amomum gracile Blume AMGR9 Zingiberaceae
serpentine arnica Arnica cernua T.J. Howell ARCE Asteraceae
serpentine bird's beak Cordylanthus tenuis Gray ssp. brunneus (Jepson) Munz COTEB Scrophulariaceae
serpentine bittercress Cardamine pachystigma (S. Wats.) Rollins CAPA79 Brassicaceae
serpentine bittercress Cardamine pachystigma (S. Wats.) Rollins var. dissectifolia (Detling) Rollins CAPAD2 Brassicaceae
serpentine bittercress Cardamine pachystigma (S. Wats.) Rollins var. pachystigma CAPAP10 Brassicaceae
serpentine collomia Collomia diversifolia Greene CODI2 Polemoniaceae
Serpentine Hill raintree Brunfelsia densifolia Krug & Urban BRDE4 Solanaceae
serpentine manjack Cordia bellonis Urban COBE3 Boraginaceae
serpentine manzanita Arctostaphylos obispoensis Eastw. AROB Ericaceae
serpentine milkweed Asclepias solanoana Woods. ASSO Asclepiadaceae
serpentine onion Allium diabolense (Ownbey & Aase) McNeal ALDI10 Liliaceae
serpentine reedgrass Calamagrostis ophitidis (J.T. Howell) Nygren CAOP2 Poaceae
serpentine sedge Carex serpenticola P. Zika CASE33 Cyperaceae
serpentine springbeauty Claytonia exigua Torr. & Gray CLEX2 Portulacaceae
serpentine springbeauty Claytonia exigua Torr. & Gray ssp. exigua CLEXE2 Portulacaceae
serpentine springbeauty Claytonia exigua Torr. & Gray ssp. glauca (Torr. & Gray) J.M. Miller & K. Chambers CLEXG2 Portulacaceae
serrate aphanorrhegma moss Aphanorrhegma serratum (Hook. f. & Wils. in Drumm.) Sull. in Gray APSE Funariaceae
serrate balsamroot Balsamorhiza serrata A. Nels. & J.F. Macbr. BASE2 Asteraceae
serviceberry Amelanchier Medik. AMELA Rosaceae
sessile joyweed Alternanthera sessilis (L.) R. Br. ex DC. ALSE4 Amaranthaceae
sessile soot lichen Cyphelium sessile (Pers.) Trevisan CYSE8 Caliciaceae
sessileflower Indian parsley Aletes sessiliflorus Theobald & Tseng ALSE5 Apiaceae
sessileleaf cyanea Cyanea sessilifolia (O. Deg.) Lammers CYSE12 Campanulaceae
sessileleaf false oxtongue Blumea sessiliflora Dcne. BLSE2 Asteraceae
sessileleaf scurvygrass Cochlearia sessilifolia Rollins COSE8 Brassicaceae
sessileleaf strap airplant Catopsis sessiliflora (Ruiz & Pavón) Mez CASE7 Bromeliaceae
seven sisters Crinum americanum L. CRAM2 Liliaceae
sevendevils onion Allium tolmiei (Hook.) Baker ex S. Wats. var. persimile Ownbey ALTOP Liliaceae
seventop turnip Brassica septiceps (L. H. Bailey) L. H. Bailey BRSE5 Brassicaceae
sevenyear apple Casasia clusiifolia (Jacq.) Urban CACL3 Rubiaceae
Sevier milkvetch Astragalus piutensis Barneby & Mabberley ASPI7 Fabaceae
Sexton Mountain mariposa lily Calochortus indecorus Ownbey & M.E. Peck CAIN18 Liliaceae
Shacklette's cryptantha Cryptantha shackletteana Higgins CRSH6 Boraginaceae
shaddock Citrus maxima (Burm. f.) Merr. CIMA5 Rutaceae
shadscale saltbush Atriplex confertifolia (Torr. & Frém.) S. Wats. ATCO Chenopodiaceae
Shafer's hawthorn Crataegus shaferi Sarg. CRSH3 Rosaceae
shagbark hickory Carya ovata (P. Mill.) K. Koch CAOV2 Juglandaceae
shagbark manzanita Arctostaphylos rudis Jepson & Wies. ex Jepson ARRU2 Ericaceae
shaggy milkvetch Astragalus malacus Gray ASMA6 Fabaceae
shakeshake Crotalaria incana L. CRIN5 Fabaceae
shale barren pussytoes Antennaria virginica Stebbins ANVI13 Asteraceae
shale barren rockcress Arabis serotina Steele ARSE9 Brassicaceae
shallow sedge Carex lurida Wahlenb. CALU5 Cyperaceae
sharktail cyanea Cyanea pinnatifida (Cham.) F. Wimmer CYPI5 Campanulaceae
sharpglume brome Bromus mucroglumis Wagnon BRMU4 Poaceae
sharpkeel milkvetch Astragalus acutirostris S. Wats. ASAC3 Fabaceae
sharpleaf silverbush Argythamnia candicans Sw. ARCA20 Euphorbiaceae
sharp-leaf spiderling Boerhavia acutifolia (Choisy) J.W. Moore BOAC3 Nyctaginaceae
sharpnut cryptantha Cryptantha oxygona (Gray) Greene CROX Boraginaceae
sharpscale flatsedge Cyperus oxylepis Nees ex Steud. CYOX Cyperaceae
sharpscale sedge Carex oxylepis Torr. & Hook. CAOX Cyperaceae
sharpscale sedge Carex oxylepis Torr. & Hook. var. oxylepis CAOXO Cyperaceae
sharpscale sedge Carex oxylepis Torr. & Hook. var. pubescens J.K. Underwood CAOXP Cyperaceae
sharptip sandwort Arenaria congesta Nutt. var. cephaloidea (Rydb.) Maguire ARCOC Caryophyllaceae
Sharsmith's onion Allium sharsmithiae (Ownbey & Aase) McNeal ALSH2 Liliaceae
Shasta chaenactis Chaenactis suffrutescens Gray CHSU Asteraceae
Shasta clarkia Clarkia borealis E. Small ssp. arida E. Small CLBOA Onagraceae
Shasta County arnica Arnica venosa Hall ARVE Asteraceae
Shasta red fir Abies ×shastensis (Lemmon) Lemmon [magnifica × procera] ABSH Pinaceae
Shasta River mariposa lily Calochortus monanthus Ownbey CAMO2 Liliaceae
Shasta sedge Carex straminiformis Bailey CAST7 Cyperaceae
Shasta snakeroot Ageratina shastensis (Taylor & Stebbins) King & H.E. Robins. AGSH2 Asteraceae
shaved sedge Carex tonsa (Fern.) Bickn. CATO10 Cyperaceae
shaved sedge Carex tonsa (Fern.) Bickn. var. tonsa CATOT Cyperaceae
sheathed sedge Carex vaginata Tausch CAVA2 Cyperaceae
sheep milkvetch Astragalus nothoxys Gray ASNO3 Fabaceae
sheep sedge Carex illota Bailey CAIL Cyperaceae
Sheldon's milkvetch Astragalus sheldonii (Rydb.) Barneby ASSH2 Fabaceae
Sheldon's sedge Carex sheldonii Mackenzie CASH Cyperaceae
shell lichen Arthopyrenia A. Massal. ARTHO2 Arthopyreniaceae
shell lichen Arthopyrenia cerasi (Schrader) A. Massal. ARCE2 Arthopyreniaceae
shell lichen Arthopyrenia cinereopruinosa (Schaerer) A. Massal. ARCI6 Arthopyreniaceae
shell lichen Arthopyrenia majuscula (Nyl.) Zahlbr. ARMA22 Arthopyreniaceae
shell lichen Arthopyrenia malaccitula (Nyl.) Zahlbr. ARMA23 Arthopyreniaceae
shell lichen Arthopyrenia minor R. C. Harris ARMI11 Arthopyreniaceae
shell lichen Arthopyrenia planorbis (Ach.) Mull. Arg. ARPL9 Arthopyreniaceae
shell lichen Arthopyrenia plumbaria (Stizenb.) R. C. Harris ARPL10 Arthopyreniaceae
shellbark hickory Carya laciniosa (Michx. f.) G. Don CALA21 Juglandaceae
shellplant Alpinia zerumbet (Pers.) Burtt & R.M. Sm. ALZE Zingiberaceae
sheoak Casuarina Rumph. ex L. CASUA Casuarinaceae
shepherd's purse Capsella bursa-pastoris (L.) Medik. CABU2 Brassicaceae
Sherring's cup orchid Brachionidium sherringii Rolfe BRSH3 Orchidaceae
shingle flatsedge Cyperus imbricatus Retz. CYIM Cyperaceae
shining false indigo Amorpha nitens Boynt. AMNI Fabaceae
shiningbranch hawthorn Crataegus corusca Sarg. CRCO27 Rosaceae
Shinner's sedge Carex shinnersii P. Rothr. & Reznicek CASH8 Cyperaceae
shiny bugseed Corispermum nitidum Kit. ex J.A. Schultes [excluded] CONI15 Chenopodiaceae
shiny cotoneaster Cotoneaster lucidus Schldl. COLU5 Rosaceae
shiny woodoats Chasmanthium nitidum (Baldw.) Yates CHNI Poaceae
shinystem spleenwort Asplenium uniseriale Raddi ASUN5 Aspleniaceae
Shipman's cyanea Cyanea shipmanii Rock CYSH Campanulaceae
Shirley Meadows mariposa lily Calochortus westonii Eastw. CAWE2 Liliaceae
Shockley's evening-primrose Camissonia heterochroma (S. Wats.) Raven CAHE12 Onagraceae
Shockley's goldenhead Acamptopappus shockleyi Gray ACSH Asteraceae
Shockley's milkvetch Astragalus serenoi (Kuntze) Sheldon var. shockleyi (M.E. Jones) Barneby ASSES4 Fabaceae
Shockley's rockcress Arabis shockleyi Munz ARSH Brassicaceae
shoebutton Ardisia elliptica Thunb. AREL4 Myrsinaceae
shoofly Caesalpinia decapetala (Roth) Alston CADE15 Fabaceae
shoreline sedge Carex hyalinolepis Steud. CAHY3 Cyperaceae
shortawn foxtail Alopecurus aequalis Sobol. ALAE Poaceae
shortawn foxtail Alopecurus aequalis Sobol. var. aequalis ALAEA Poaceae
shortbeak sedge Carex brevior (Dewey) Mackenzie CABR10 Cyperaceae
shortbristled needlegrass Achnatherum brachychaetum (Godr.) Barkworth ACBR5 Poaceae
shortflower Indian paintbrush Castilleja puberula Rydb. CAPU19 Scrophulariaceae
shortflower rattlebox Crotalaria breviflora DC. CRBR16 Fabaceae
shorthair reedgrass Calamagrostis breweri Thurb. CABR Poaceae
shorthair sedge Carex exserta Mackenzie CAEX4 Cyperaceae
shorthusk Brachyelytrum Beauv. BRACH2 Poaceae
shortleaf baccharis Baccharis brachyphylla Gray BABR Asteraceae
shortleaf bruchia moss Bruchia brevifolia Sull. BRBR8 Bruchiaceae
shortleaved sedge Carex misandra R. Br. CAMI10 Cyperaceae
short-lobe Indian paintbrush Castilleja hispida Benth. ssp. brevilobata (Piper) Chuang & Heckard CAHIB Scrophulariaceae
Short's milkvetch Astragalus shortianus Nutt. ASSH3 Fabaceae
Short's rockcress Arabis shortii (Fern.) Gleason ARSH2 Brassicaceae
Short's sedge Carex shortiana Dewey CASH2 Cyperaceae
Short's spreading chervil Chaerophyllum procumbens (L.) Crantz var. shortii Torr. & Gray CHPRS Apiaceae
shortspike bluestem Andropogon brachystachyus Chapman ANBR2 Poaceae
shortspike windmill grass Chloris ×subdolichostachya Muell. (pro sp.) [cucullata × verticillata] CHSU3 Poaceae
shortstalk chickweed Cerastium brachypodum (Engelm. ex Gray) B.L. Robins. CEBR3 Caryophyllaceae
shortstalk false bindweed Calystegia silvatica (Kit.) Griseb. CASI10 Convolvulaceae
shortstalk false bindweed Calystegia silvatica (Kit.) Griseb. ssp. fraterniflora (Mackenzie & Bush) Brummitt CASIF Convolvulaceae
shortstalk false bindweed Calystegia silvatica (Kit.) Griseb. ssp. silvatica CASIS Convolvulaceae
shortstalk sedge Carex podocarpa R. Br. CAPO Cyperaceae
shortstalk stinkweed Cleomella brevipes S. Wats. CLBR2 Capparaceae
shortstem sedge Carex brevicaulis Mackenzie CABR8 Cyperaceae
shortstyle Indian paintbrush Castilleja brevistyla (Hoover) Chuang & Heckard CABR37 Scrophulariaceae
shortstyle onion Allium brevistylum S. Wats. ALBR2 Liliaceae
shorttooth Canadian milkvetch Astragalus canadensis L. var. brevidens (Gandog.) Barneby ASCAB Fabaceae
showy balloonvine Cardiospermum grandiflorum Sw. CAGR13 Sapindaceae
showy colchicum Colchicum speciosum Steven COSP12 Liliaceae
showy lady's slipper Cypripedium reginae Walt. CYRE6 Orchidaceae
showy milkweed Asclepias speciosa Torr. ASSP Asclepiadaceae
showy pigeonpea Cajanus scarabaeoides (L.) Thouars CASC33 Fabaceae
showy pussytoes Antennaria pulcherrima (Hook.) Greene ANPU Asteraceae
showy rattlebox Crotalaria spectabilis Roth CRSP2 Fabaceae
showy sedge Carex spectabilis Dewey CASP5 Cyperaceae
showy spleenwort Asplenium formosum Willd. ASFO2 Aspleniaceae
shredding suncup Camissonia boothii (Dougl. ex Lehm.) Raven ssp. condensata (Munz) Raven CABOC Onagraceae
shredding suncup Camissonia boothii (Dougl. ex Lehm.) Raven ssp. decorticans (Hook. & Arn.) Raven CABOD Onagraceae
Shreve's prairie acacia Acacia angustissima (P. Mill.) Kuntze var. shrevei (Britt. & Rose) Isely ACANS Fabaceae
shrubby brickellbush Brickellia frutescens Gray BRFR Asteraceae
shrubby copperleaf Acalypha phleoides Cav. ACPH3 Euphorbiaceae
shrubby Indian mallow Abutilon abutiloides (Jacq.) Garcke ex Britt. & P. Wilson ABAB Malvaceae
shrubby jointvetch Aeschynomene evenia C. Wright AEEV Fabaceae
shrubland beggarticks Bidens sandvicensis Less. BISA2 Asteraceae
shrubland beggarticks Bidens sandvicensis Less. ssp. confusa Nagata & Ganders BISAC Asteraceae
shrubland beggarticks Bidens sandvicensis Less. ssp. sandvicensis BISAS2 Asteraceae
shyleaf Aeschynomene americana L. AEAM Fabaceae
Siberian alder Alnus viridis (Chaix) DC. ssp. fruticosa (Rupr.) Nyman ALVIF Betulaceae
Siberian bugseed Corispermum pallasii Steven COPA38 Chenopodiaceae
Siberian dotted lichen Bacidia siberiensis (Willey) Zahlbr. BASI3 Bacidiaceae
Siberian hazelnut Corylus heterophylla Fisch. ex Trautv. COHE12 Betulaceae
Siberian kale Brassica napus L. var. pabularia (DC.) Reichb. BRNAP Brassicaceae
Siberian peashrub Caragana arborescens Lam. CAAR18 Fabaceae
Siberian pea-tree Caragana boisii C. K. Schneid. CABO19 Fabaceae
Siberian pygmyweed Crassula sieberiana (J.A. Schultes) Druce CRSI5 Crassulaceae
Siberian saltbush Atriplex sibirica L. ATSI2 Chenopodiaceae
Siberian sea rosemary Argusia sibirica (L.) Dandy ARSI5 Boraginaceae
Siberian sea thrift Armeria maritima (P. Mill.) Willd. ssp. sibirica (Turcz. ex Boiss.) Nyman ARMAS Plumbaginaceae
Siberian springbeauty Claytonia sibirica L. CLSI2 Portulacaceae
Siberian springbeauty Claytonia sibirica L. var. bulbifera Gray CLSIB Portulacaceae
Siberian springbeauty Claytonia sibirica L. var. sibirica CLSIS Portulacaceae
Siberian wheatgrass Agropyron fragile (Roth) P. Candargy AGFR Poaceae
Siberian wormwood Artemisia laciniata Willd. ARLA9 Asteraceae
Siberian yarrow Achillea sibirica Ledeb. ACSI Asteraceae
Siberian-tea Bergenia crassifolia (L.) Fritsch BECR3 Saxifragaceae
sickle pigeonwings Clitoria falcata Lam. CLFA2 Fabaceae
sickle saltbush Atriplex falcata (M.E. Jones) Standl. ATFA Chenopodiaceae
sickle speenwort Asplenium polyodon G. Forst. ASPO4 Aspleniaceae
sickle tickseed Coreopsis falcata Boynt. COFA Asteraceae
sicklepod Arabis canadensis L. ARCA Brassicaceae
sicklepod rockcress Arabis sparsiflora Nutt. ARSP Brassicaceae
sicklepod rockcress Arabis sparsiflora Nutt. var. sparsiflora ARSPS2 Brassicaceae
sidecluster milkweed Asclepias lanuginosa Nutt. ASLA3 Asclepiadaceae
sideoats grama Bouteloua curtipendula (Michx.) Torr. BOCU Poaceae
sideoats grama Bouteloua curtipendula (Michx.) Torr. var. caespitosa Gould & Kapadia BOCUC Poaceae
sideoats grama Bouteloua curtipendula (Michx.) Torr. var. curtipendula BOCUC2 Poaceae
Sieber's crocus Crocus sieberi J. Gay CRSI6 Iridaceae
Sierra bittercress Cardamine breweri S. Wats. var. orbicularis (Greene) Detling CABRO Brassicaceae
Sierra brodiaea Brodiaea purdyi Eastw. BRPU16 Liliaceae
Sierra brookfoam Boykinia intermedia (Piper) G.N. Jones BOIN4 Saxifragaceae
Sierra clarkia Clarkia virgata Greene CLVI2 Onagraceae
Sierra columbine Aquilegia pubescens Coville AQPU Ranunculaceae
Sierra cryptantha Cryptantha nubigena (Greene) Payson CRNU2 Boraginaceae
Sierra false bindweed Calystegia malacophylla (Greene) Munz CAMA38 Convolvulaceae
Sierra false bindweed Calystegia malacophylla (Greene) Munz ssp. malacophylla CAMAM4 Convolvulaceae
Sierra false bindweed Calystegia malacophylla (Greene) Munz ssp. malacophylla var. berryi (Eastw.) Brummitt CAMAB3 Convolvulaceae
Sierra false bindweed Calystegia malacophylla (Greene) Munz ssp. malacophylla var. malacophylla CAMAM11 Convolvulaceae
Sierra false bindweed Calystegia malacophylla (Greene) Munz ssp. pedicellata (Jepson) Munz CAMAP Convolvulaceae
Sierra false coolwort Bolandra californica Gray BOCA Saxifragaceae
Sierra fumewort Corydalis caseana Gray COCA15 Fumariaceae
Sierra fumewort Corydalis caseana Gray ssp. brachycarpa (Rydb.) G.B. Ownbey COCAB Fumariaceae
Sierra fumewort Corydalis caseana Gray ssp. caseana COCAC7 Fumariaceae
Sierra fumewort Corydalis caseana Gray ssp. hastata (Rydb.) G.B. Ownbey COCAH2 Fumariaceae
Sierra hare sedge Carex leporinella Mackenzie CALE9 Cyperaceae
Sierra mariposa lily Calochortus minimus Ownbey CAMI Liliaceae
Sierra milkvetch Astragalus lentiginosus Dougl. ex Hook. var. sierrae M.E. Jones ASLES5 Fabaceae
Sierra nakedwood Colubrina greggii S. Wats. COGR7 Rhamnaceae
Sierra needlegrass Achnatherum latiglume (Swallen) Barkworth ACLA8 Poaceae
Sierra pussytoes Antennaria pulchella Greene ANPU8 Asteraceae
Sierra sedge Carex nervina Bailey CANE5 Cyperaceae
Sierra slender sedge Carex teneriformis Mackenzie CATE4 Cyperaceae
Sierra springbeauty Claytonia nevadensis S. Wats. CLNE Portulacaceae
Sierra suncup Camissonia sierrae Raven CASI9 Onagraceae
Sierra suncup Camissonia sierrae Raven ssp. sierrae CASIS2 Onagraceae
Sierra Valley evening-primrose Camissonia tanacetifolia (Torr. & Gray) Raven ssp. quadriperforata Raven CATAQ Onagraceae
Sierra woolly Indian paintbrush Castilleja lanata Gray CALA24 Scrophulariaceae
Sierra woolly Indian paintbrush Castilleja lanata Gray ssp. lanata CALAL11 Scrophulariaceae
signalgrass Brachiaria (Trin.) Griseb. BRACH Poaceae
silk cottontree Cochlospermum vitifolium (Willd.) Willd. ex Spreng. COVI Bixaceae
silk-cotton tree Cochlospermum religiosum (L.) Alston CORE11 Bixaceae
silk-floss tree Chorisia speciosa St.-Hil. CHSP13 Bombacaceae
silktree Albizia julibrissin Durazz. ALJU Fabaceae
silky balsamroot Balsamorhiza sericea W.A. Weber BASE4 Asteraceae
silky cryptantha Cryptantha sericea (Gray) Payson CRSE3 Boraginaceae
silky dogwood Cornus amomum P. Mill. COAM2 Cornaceae
silky dogwood Cornus obliqua Raf. COOB9 Cornaceae
silky jackbean Canavalia sericea Gray CASE9 Fabaceae
silky milkvetch Astragalus sericoleucus Gray ASSE5 Fabaceae
silky silverbush Argythamnia argyraea Cory ARAR5 Euphorbiaceae
silkybent Apera Adans. APERA Poaceae
silkyscale Anthaenantia Beauv. ANTHA Poaceae
silver banksia Banksia marginata Cav. BAMA15 Proteaceae
silver beardgrass Bothriochloa laguroides (DC.) Herter BOLA2 Poaceae
silver beardgrass Bothriochloa laguroides (DC.) Herter ssp. laguroides BOLAL2 Poaceae
silver beardgrass Bothriochloa laguroides (DC.) Herter ssp. torreyana (Steud.) Allred & Gould BOLAT Poaceae
silver bluestem Bothriochloa saccharoides (Sw.) Rydb. BOSA Poaceae
silver burr ragweed Ambrosia chamissonis (Less.) Greene AMCH4 Asteraceae
silver cock's comb Celosia argentea L. CEAR3 Amaranthaceae
silver fir Abies alba P. Mill. ABAL3 Pinaceae
silver hairgrass Aira caryophyllea L. AICA Poaceae
silver hairgrass Aira caryophyllea L. var. caryophyllea AICAC2 Poaceae
silver July croton Croton argenteus L. CRAR5 Euphorbiaceae
silver maple Acer saccharinum L. ACSA2 Aceraceae
silver mountain mahogany Cercocarpus montanus Raf. var. argenteus (Rydb.) F.L. Martin CEMOA Rosaceae
silver palm Coccothrinax Sarg. COCCO2 Arecaceae
silver pussytoes Antennaria argentea Benth. ANAR5 Asteraceae
silver rockcress Arabis puberula Nutt. ARPU Brassicaceae
silver sagebrush Artemisia cana Pursh ARCA13 Asteraceae
silver sagebrush Artemisia cana Pursh ssp. bolanderi (Gray) G.H. Ward ARCAB3 Asteraceae
silver sagebrush Artemisia cana Pursh ssp. cana ARCAC5 Asteraceae
silver sagebrush Artemisia cana Pursh ssp. viscidula (Osterhout) Beetle ARCAV2 Asteraceae
silver saltbush Atriplex bunburyana F. Muell. ATBU3 Chenopodiaceae
silver saltbush Atriplex rhagodioides F. Muell. ATRH3 Chenopodiaceae
silver vine Actinidia polygama (Sieb. & Zucc.) Maxim. ACPO9 Actinidiaceae
silver wattle Acacia dealbata Link ACDE3 Fabaceae
silverbush Argythamnia P. Br. ARGYT Euphorbiaceae
silvercrown Cacaliopsis nardosmia (Gray) Gray CANA5 Asteraceae
silvergreen bryum moss Bryum argenteum Hedw. BRAR71 Bryaceae
silverhair pineapplegrass Astelia argyrocoma Heller ex Skottsberg ASAR9 Liliaceae
silverhead Blutaparon vermiculare (L.) Mears BLVE Amaranthaceae
silverleaf cotoneaster Cotoneaster pannosus Franch. COPA14 Rosaceae
silverleaf milkvetch Astragalus argophyllus Nutt. ASAR4 Fabaceae
silverleaf milkvetch Astragalus argophyllus Nutt. var. argophyllus ASARA Fabaceae
silverleaf milkvetch Astragalus argophyllus Nutt. var. martinii M.E. Jones ASARM Fabaceae
silverleaf milkvetch Astragalus argophyllus Nutt. var. panguicensis (M.E. Jones) M.E. Jones ASARP Fabaceae
silverleaf milkvetch Astragalus argophyllus Nutt. var. stocksii Barneby ex Isely ASARS Fabaceae
silverling Baccharis glomeruliflora Pers. BAGL Asteraceae
silverpuff Chaptalia texana Greene CHTE6 Asteraceae
Silver's milkvetch Astragalus subcinereus Gray ASSU6 Fabaceae
silverscale saltbush Atriplex argentea Nutt. ATAR2 Chenopodiaceae
silverscale saltbush Atriplex argentea Nutt. ssp. argentea ATARA Chenopodiaceae
silverscale saltbush Atriplex argentea Nutt. ssp. argentea var. argentea ATARA2 Chenopodiaceae
silverscale saltbush Atriplex argentea Nutt. ssp. expansa (S. Wats.) Hall & Clements ATARE Chenopodiaceae
silver-stem wattle Acacia parvipinnula Tindale ACPA9 Fabaceae
silversword Argyroxiphium DC. ARGYR Asteraceae
silverweed Argentina Hill ARGEN Rosaceae
silverweed cinquefoil Argentina anserina (L.) Rydb. ARAN7 Rosaceae
silvery sedge Carex canescens L. CACA11 Cyperaceae
silvery sedge Carex canescens L. ssp. canescens CACAC6 Cyperaceae
silvery sedge Carex canescens L. ssp. disjuncta (Fern.) Toivonen CACAD2 Cyperaceae
simil onion Allium simillimum Henderson ALSI Liliaceae
Simons' cotoneaster Cotoneaster simonsii Baker COSI82 Rosaceae
simpler hollyfern Arachniodes simplicior (Makino) Ohwi ARSI4 Dryopteridaceae
Simpson's croton Croton glandulosus L. var. simpsonii Ferguson CRGLS2 Euphorbiaceae
Simpson's grasspink Calopogon tuberosus (L.) B.S.P. var. simpsonii (Chapman) Magrath CATUS Orchidaceae
single threeawn Aristida schiedeana Trin. & Rupr. ARSC3 Poaceae
singleflower cyrtandra Cyrtandra hematos St. John CYHE4 Gesneriaceae
singleflower knapweed Centaurea uniflora Turra CEUN2 Asteraceae
singleflower knapweed Centaurea uniflora Turra ssp. nervosa (Willd.) Bonnier & Layens CEUNN Asteraceae
singlehead pussytoes Antennaria solitaria Rydb. ANSO Asteraceae
singlesorus spleenwort Asplenium monanthes L. ASMO Aspleniaceae
Sintenis' quina Antirhea sintenisii Urban ANSI Rubiaceae
sisal hemp Agave sisalana Perrine AGSI2 Agavaceae
Siskiyou Indian paintbrush Castilleja miniata Dougl. ex Hook. ssp. elata (Piper) Munz CAMIE Scrophulariaceae
Siskiyou mariposa lily Calochortus persistens Ownbey CAPE Liliaceae
Siskiyou milkvetch Astragalus whitneyi Gray var. siskiyouensis (Rydb.) Barneby ASWHS Fabaceae
Siskiyou onion Allium siskiyouense Ownbey ALSI2 Liliaceae
Siskiyou sedge Carex scabriuscula Mackenzie CASC14 Cyperaceae
Sitka alder Alnus viridis (Chaix) DC. ssp. sinuata (Regel) A.& D. Löve ALVIS Betulaceae
Sitka rockbrake Cryptogramma sitchensis (Rupr.) T. Moore CRSI7 Pteridaceae
Sitka sedge Carex aquatilis Wahlenb. var. dives (Holm) Kükenth. CAAQD Cyperaceae
sixweeks grama Bouteloua barbata Lag. BOBA2 Poaceae
sixweeks threeawn Aristida adscensionis L. ARAD Poaceae
skeletonleaf burr ragweed Ambrosia tomentosa Nutt. AMTO3 Asteraceae
skeletonweed Chaetadelpha Gray ex S. Wats. CHAET Asteraceae
skiff milkvetch Astragalus microcymbus Barneby ASMI3 Fabaceae
Skinner's false foxglove Agalinis skinneriana (Wood) Britt. AGSK Scrophulariaceae
sleeping Ute milkvetch Astragalus tortipes J.L. Anderson & J.M. Porter ASTO9 Fabaceae
sleepygrass Achnatherum robustum (Vasey) Barkworth ACRO7 Poaceae
slender amaranth Amaranthus viridis L. AMVI Amaranthaceae
slender bird's beak Cordylanthus tenuis Gray COTE3 Scrophulariaceae
slender bird's beak Cordylanthus tenuis Gray ssp. tenuis COTET2 Scrophulariaceae
slender bird's beak Cordylanthus tenuis Gray ssp. viscidus (T.J. Howell) Chuang & Heckard COTEV Scrophulariaceae
slender centaury Centaurium tenuiflorum (Hoffmannsegg & Link) Fritsch CETE9 Gentianaceae
slender chickweed Cerastium gracile Dufour CEGR7 Caryophyllaceae
slender clarkia Clarkia gracilis (Piper) A. Nels. & J.F. Macbr. CLGR Onagraceae
slender clarkia Clarkia gracilis (Piper) A. Nels. & J.F. Macbr. ssp. gracilis CLGRG2 Onagraceae
slender cleomella Cleomella parviflora Gray CLPA4 Capparaceae
slender cryptantha Cryptantha sparsiflora (Greene) Greene CRSP3 Boraginaceae
slender dodder Cuscuta leptantha Engelm. CULE Cuscutaceae
slender false brome Brachypodium sylvaticum (Huds.) Beauv. BRSY Poaceae
slender flatsedge Cyperus bipartitus Torr. CYBI6 Cyperaceae
slender grama Bouteloua repens (Kunth) Scribn. & Merr. BORE2 Poaceae
slender hawksbeard Crepis atribarba Heller CRAT Asteraceae
slender hawksbeard Crepis atribarba Heller ssp. atribarba CRATA2 Asteraceae
slender hawksbeard Crepis atribarba Heller ssp. originalis (Babcock & Stebbins) Babcock & Stebbins CRATO Asteraceae
slender hawthorn Crataegus exilis Beadle CREX2 Rosaceae
slender leaf rattlebox Crotalaria ochroleuca G. Don CROC80 Fabaceae
slender lipfern Cheilanthes feei T. Moore CHFE Pteridaceae
slender looseflower sedge Carex gracilescens Steud. CAGR8 Cyperaceae
slender mariposa lily Calochortus clavatus S. Wats. var. gracilis Ownbey CACLG Liliaceae
slender meadow foxtail Alopecurus myosuroides Huds. ALMY Poaceae
slender milkvetch Astragalus gracilis Nutt. ASGR3 Fabaceae
slender mountain sandwort Arenaria capillaris Poir. ARCA7 Caryophyllaceae
slender mountain sandwort Arenaria capillaris Poir. ssp. capillaris ARCAC6 Caryophyllaceae
slender oat Avena barbata Pott ex Link AVBA Poaceae
slender parsley piert Aphanes microcarpa (Boiss. & Reut.) Rothm. APMI Rosaceae
slender pinepink Bletia florida (Salisb.) R. Br. ex Ait. f. BLFL Orchidaceae
slender saltbush Atriplex tenuissima A. Nels. ATTE Chenopodiaceae
slender sand verbena Abronia gracilis Benth. ABGR2 Nyctaginaceae
slender sandbur Cenchrus gracillimus Nash CEGR3 Poaceae
slender scratchdaisy Croptilon divaricatum (Nutt.) Raf. CRDI17 Asteraceae
slender sedge Carex gracilior Mackenzie CAGR9 Cyperaceae
slender sensitive pea Chamaecrista serpens (L.) Greene CHSE9 Fabaceae
slender sensitive pea Chamaecrista serpens (L.) Greene var. serpens CHSES2 Fabaceae
slender soft brome Bromus lepidus Holmb. BRLE5 Poaceae
slender spiderflower Cleome multicaulis DC. CLMU Capparaceae
slender spiderling Boerhavia triquetra S. Wats. BOTR Nyctaginaceae
slender threeseed mercury Acalypha gracilens Gray ACGR2 Euphorbiaceae
slender threeseed mercury Acalypha monococca (Engelm. ex Gray) L. Mill. & Gandhi ACMO4 Euphorbiaceae
slender toothwort Cardamine angustata O.E. Schulz CAAN11 Brassicaceae
slender wild basil Clinopodium gracile (Benth.) Kuntze CLGR4 Lamiaceae
slender wild cabbage Caulanthus major (M.E. Jones) Payson CAMA17 Brassicaceae
slender wild cabbage Caulanthus major (M.E. Jones) Payson var. major CAMAM14 Brassicaceae
slender wild cabbage Caulanthus major (M.E. Jones) Payson var. nevadensis Rollins CAMAN Brassicaceae
slender woodland sedge Carex digitalis Willd. CADI5 Cyperaceae
slender woodland sedge Carex digitalis Willd. var. digitalis CADID2 Cyperaceae
slender woodoats Chasmanthium laxum (L.) Yates CHLA6 Poaceae
slenderbeak sedge Carex athrostachya Olney CAAT3 Cyperaceae
slenderflower saltbush Atriplex graciliflora M.E. Jones ATGR Chenopodiaceae
slender-fruit saltbush Atriplex leptocarpa F. Muell. ATLE3 Chenopodiaceae
slenderleaf false foxglove Agalinis tenuifolia (Vahl) Raf. AGTE3 Scrophulariaceae
slenderleaf false foxglove Agalinis tenuifolia (Vahl) Raf. var. leucanthera (Raf.) Pennell AGTEL Scrophulariaceae
slenderleaf false foxglove Agalinis tenuifolia (Vahl) Raf. var. macrophylla (Benth.) Blake AGTEM Scrophulariaceae
slenderleaf false foxglove Agalinis tenuifolia (Vahl) Raf. var. parviflora (Nutt.) Pennell AGTEP2 Scrophulariaceae
slenderleaf false foxglove Agalinis tenuifolia (Vahl) Raf. var. polyphylla (Small) Pennell AGTEP3 Scrophulariaceae
slenderleaf false foxglove Agalinis tenuifolia (Vahl) Raf. var. tenuifolia AGTET Scrophulariaceae
slim amaranth Amaranthus hybridus L. AMHY Amaranthaceae
slim milkweed Asclepias linearis Scheele ASLI Asclepiadaceae
slimbristle sandbur Cenchrus brownii Roemer & J.A. Schultes CEBR Poaceae
slimfoot century plant Agave gracilipes Trel. AGGR4 Agavaceae
slimjim flatsedge Cyperus gracilis R. Br. CYGR9 Cyperaceae
slimleaf burr ragweed Ambrosia tenuifolia Spreng. AMTE5 Asteraceae
slimleaf goosefoot Chenopodium pallescens Standl. CHPA5 Chenopodiaceae
slimleaf milkweed Asclepias stenophylla Gray ASST Asclepiadaceae
slimleaf pawpaw Asimina angustifolia Raf. ASAN6 Annonaceae
slimlobe bahia Bahia biternata Gray BABI3 Asteraceae
slimlobe beggarticks Bidens tenuisecta Gray BITE Asteraceae
slimpod milkweed Asclepias quinquedentata Gray ASQU2 Asclepiadaceae
slimseed sandmat Chamaesyce stictospora (Engelm.) Small CHST8 Euphorbiaceae
slimspike threeawn Aristida longespica Poir. ARLO16 Poaceae
slimspike threeawn Aristida longespica Poir. var. geniculata (Raf.) Fern. ARLOG6 Poaceae
slimspike threeawn Aristida longespica Poir. var. longespica ARLOL3 Poaceae
slimspike windmill grass Chloris andropogonoides Fourn. CHAN Poaceae
slimstalk spiderling Boerhavia gracillima Heimerl BOGR Nyctaginaceae
slimstem reedgrass Calamagrostis stricta (Timm) Koel. CAST36 Poaceae
slimstem reedgrass Calamagrostis stricta (Timm) Koel. ssp. stricta CASTS5 Poaceae
slimstem reedgrass Calamagrostis stricta (Timm) Koel. ssp. stricta var. stricta CASTS8 Poaceae
slipper flower Calceolaria L. CALCE2 Scrophulariaceae
slipper flower Calceolaria multiflora Cav. CAMU26 Scrophulariaceae
slippery burr Corchorus siliquosus L. COSI3 Tiliaceae
slough sedge Carex obnupta Bailey CAOB3 Cyperaceae
slough thistle Cirsium crassicaule (Greene) Jepson CICR Asteraceae
sloughgrass Beckmannia Host BECKM Poaceae
slugwood Beilschmiedia pendula (Sw.) Hemsl. BEPE Lauraceae
small archidium moss Archidium minus (Ren. & Card.) Snider ARMI12 Archidiaceae
small beggarticks Bidens discoidea (Torr. & Gray) Britt. BIDI Asteraceae
small bonny bellflower Campanula divaricata Michx. CADI3 Campanulaceae
small bugloss Anchusa arvensis (L.) Bieb. ANAR16 Boraginaceae
small camas Camassia quamash (Pursh) Greene CAQU2 Liliaceae
small camas Camassia quamash (Pursh) Greene ssp. azurea (Heller) Gould CAQUA Liliaceae
small camas Camassia quamash (Pursh) Greene ssp. breviflora Gould CAQUB2 Liliaceae
small camas Camassia quamash (Pursh) Greene ssp. intermedia Gould CAQUI Liliaceae
small camas Camassia quamash (Pursh) Greene ssp. linearis Gould CAQUL2 Liliaceae
small camas Camassia quamash (Pursh) Greene ssp. maxima Gould CAQUM Liliaceae
small camas Camassia quamash (Pursh) Greene ssp. quamash CAQUQ Liliaceae
small carpgrass Arthraxon hispidus (Thunb.) Makino ARHI3 Poaceae
small enchanter's nightshade Circaea alpina L. CIAL Onagraceae
small enchanter's nightshade Circaea alpina L. ssp. alpina CIALA Onagraceae
small enchanter's nightshade Circaea alpina L. ssp. pacifica (Aschers. & Magnus) Raven CIALP2 Onagraceae
small evening-primrose Camissonia minor (A. Nels.) Raven CAMI23 Onagraceae
small mountain bittercress Cardamine clematitis Shuttlw. ex Gray CACL2 Brassicaceae
small onion Allium parvum Kellogg ALPA3 Liliaceae
small Philippine acacia Acacia confusa Merr. ACCO Fabaceae
small pussytoes Antennaria howellii Greene ssp. petaloidea (Fern.) Bayer ANHOP Asteraceae
small saltbush Atriplex eardleyae Aellen ATEA Chenopodiaceae
small shell ginger Alpinia mutica Roxb. ALMU2 Zingiberaceae
small spreading pogonia Cleistes bifaria (Fern.) Catling & Gregg CLBI3 Orchidaceae
small treefern Cyathea parvula (Jenman) Domin CYPA7 Cyatheaceae
small yellow nicker Caesalpinia divergens Urban CADI12 Fabaceae
smallawned sedge Carex microchaeta Holm CAMI4 Cyperaceae
smallawned sedge Carex microchaeta Holm ssp. microchaeta CAMIM Cyperaceae
smallbract sedge Carex subbracteata Mackenzie CASU4 Cyperaceae
smallbristle hound's tongue Cynoglossum microglochin Benth. CYMI3 Boraginaceae
smallflower bruguiera Bruguiera parviflora (Roxb.) Wight & Arn. ex Griffith BRPA15 Rhizophoraceae
smallflower century plant Agave parviflora Torr. AGPA5 Agavaceae
smallflower clermontia Clermontia parviflora Gaud. ex Gray CLPA8 Campanulaceae
smallflower columbine Aquilegia brevistyla Hook. AQBR Ranunculaceae
smallflower false foxglove Agalinis paupercula (Gray) Britt. AGPA12 Scrophulariaceae
smallflower false foxglove Agalinis paupercula (Gray) Britt. var. borealis Pennell AGPAB Scrophulariaceae
smallflower false foxglove Agalinis paupercula (Gray) Britt. var. paupercula AGPAP3 Scrophulariaceae
smallflower fumewort Corydalis micrantha (Engelm. ex Gray) Gray COMI2 Fumariaceae
smallflower fumewort Corydalis micrantha (Engelm. ex Gray) Gray ssp. australis (Chapman) G.B. Ownbey COMIA2 Fumariaceae
smallflower fumewort Corydalis micrantha (Engelm. ex Gray) Gray ssp. micrantha COMIM2 Fumariaceae
smallflower hawksbeard Crepis pulchra L. CRPU3 Asteraceae
smallflower Indian paintbrush Castilleja parviflora Bong. var. albida (Pennell) Ownbey CAPAA3 Scrophulariaceae
smallflower Indian paintbrush Castilleja parviflora Bong. var. parviflora CAPAP8 Scrophulariaceae
smallflower lilythorn Catesbaea parviflora Sw. CAPA43 Rubiaceae
smallflower pawpaw Asimina parviflora (Michx.) Dunal ASPA18 Annonaceae
smallflower soap plant Chlorogalum parviflorum S. Wats. CHPA7 Liliaceae
smallflower swallow-wort Cynanchum parviflorum Sw. CYPA10 Asclepiadaceae
smallflower western rosinweed Calycadenia pauciflora Gray CAPA6 Asteraceae
smallflower wrightwort Carlowrightia parviflora (Buckl.) Wasshausen CAPA42 Acanthaceae
smallflowered anemone Anemone parviflora Michx. ANPA Ranunculaceae
smallflowered anemone Anemone parviflora Michx. var. grandiflora Ulbr. ANPAG Ranunculaceae
smallflowered anemone Anemone parviflora Michx. var. parviflora ANPAP2 Ranunculaceae
smallflowered milkvetch Astragalus nuttallianus DC. ASNU4 Fabaceae
smallflowered milkvetch Astragalus nuttallianus DC. var. austrinus (Small) Barneby ASNUA Fabaceae
smallflowered milkvetch Astragalus nuttallianus DC. var. nuttallianus ASNUN Fabaceae
smallfruit agrimony Agrimonia microcarpa Wallr. AGMI2 Rosaceae
smallfruit beggarticks Bidens mitis (Michx.) Sherff BIMI Asteraceae
smallhead arnica Arnica gracilis Rydb. ARGR14 Asteraceae
smallhead doll's daisy Boltonia diffusa Ell. BODI Asteraceae
smallhead doll's daisy Boltonia diffusa Ell. var. diffusa BODID Asteraceae
smallhead doll's daisy Boltonia diffusa Ell. var. interior Fern. & Grisc. BODII Asteraceae
smallhead star-thistle Centaurea calcitrapoides L. CECA5 Asteraceae
small-leaf angelica Angelica pinnata S. Wats. ANPI2 Apiaceae
small-leaf bentgrass Agrostis microphylla Steud. AGMI3 Poaceae
small-leaf bittercress Cardamine microphylla M.F. Adams CAMI3 Brassicaceae
small-leaf bittercress Cardamine microphylla M.F. Adams ssp. blaisdellii (Eastw.) D.F. Murray & S. Kelso CAMIB Brassicaceae
small-leaf bittercress Cardamine microphylla M.F. Adams ssp. microphylla CAMIM7 Brassicaceae
small-leaf false cloak fern Argyrochosma microphylla (Mett. ex Kuhn) Windham ARMI6 Pteridaceae
small-leaf geigertree Cordia parvifolia A. DC. COPA16 Boraginaceae
smallleaf giant hyssop Agastache parvifolia Eastw. AGPA2 Lamiaceae
small-leaf pussytoes Antennaria parvifolia Nutt. ANPA4 Asteraceae
small-leaf pygmyweed Crassula drummondii (Torr. & Gray) Fedde CRDR Crassulaceae
Small's acroporium moss Acroporium smallii (Williams) Crum & Anderson ACSM3 Sematophyllaceae
Small's rainlily Cooperia smallii Alexander COSM Liliaceae
Small's southern clarkia Clarkia australis E. Small CLAU2 Onagraceae
smallseed pygmyweed Crassula longipes (Rose) Bywater & Wickens CRLO7 Crassulaceae
smallseed sandmat Chamaesyce polycarpa (Benth.) Millsp. ex Parish CHPO12 Euphorbiaceae
smallspike false nettle Boehmeria cylindrica (L.) Sw. BOCY Urticaceae
smallwing sedge Carex microptera Mackenzie CAMI7 Cyperaceae
smartweed dodder Cuscuta polygonorum Engelm. CUPO Cuscutaceae
smokebush Buddleja madagascariensis Lam. BUMA80 Buddlejaceae
smoketree Cotinus P. Mill. COTIN Anacardiaceae
smokey mariposa Calochortus leichtlinii Hook. f. CALE3 Liliaceae
smooth ayenia Ayenia glabra S. Wats. AYGL Sterculiaceae
smooth babybonnets Coursetia glabella (Gray) Lavin COGL7 Fabaceae
smooth baccharis Baccharis plummerae Gray ssp. glabrata Hoover BAPLG Asteraceae
smooth bedstraw Cruciata laevipes Opiz CRLA13 Rubiaceae
smooth beggartick Bidens laevis (L.) B.S.P. BILA Asteraceae
smooth black sedge Carex nigra (L.) Reichard CANI5 Cyperaceae
smooth brome Bromus inermis Leyss. BRIN2 Poaceae
smooth brome Bromus inermis Leyss. ssp. inermis BRINI Poaceae
smooth brome Bromus inermis Leyss. ssp. inermis var. divaricatus Rohlena BRIND Poaceae
smooth brome Bromus inermis Leyss. ssp. inermis var. inermis BRINI2 Poaceae
smooth cryptantha Cryptantha semiglabra Barneby CRSE4 Boraginaceae
smooth cyanea Cyanea glabra (F. Wimmer) St. John CYGL5 Campanulaceae
smooth false indigo Amorpha laevigata Nutt. AMLA2 Fabaceae
smooth flatsedge Cyperus laevigatus L. CYLA2 Cyperaceae
smooth goosefoot Chenopodium subglabrum (S. Wats.) A. Nels. CHSU2 Chenopodiaceae
smooth hawksbeard Crepis capillaris (L.) Wallr. CRCA3 Asteraceae
smooth hawthorn Crataegus laevigata (Poir.) DC. CRLA80 Rosaceae
smooth honeytree Casearia nitida Jacq. CANI17 Flacourtiaceae
smooth joyweed Alternanthera paronichyoides St.-Hil. ALPA17 Amaranthaceae
smooth joyweed Alternanthera paronichyoides St.-Hil. var. amazonica Huber ALPAA2 Amaranthaceae
smooth joyweed Alternanthera paronichyoides St.-Hil. var. paronichyoides ALPAP Amaranthaceae
smooth loco milkvetch Astragalus curvicarpus (Heller) J.F. Macbr. var. subglaber (Rydb.) Barneby ASCUS Fabaceae
smooth manjack Cordia laevigata Lam. COLA12 Boraginaceae
smooth mountain mahogany Cercocarpus montanus Raf. var. minutiflorus (Abrams) F.L. Martin CEMOM Rosaceae
smooth northern-rockcress Braya glabella Richards. BRGL Brassicaceae
smooth northern-rockcress Braya glabella Richards. ssp. glabella BRGLG Brassicaceae
smooth northern-rockcress Braya glabella Richards. ssp. purpurascens (R. Br.) Cody BRGLP Brassicaceae
smooth pricklypoppy Argemone glauca (Nutt. ex Prain) Pope ARGL10 Papaveraceae
smooth pricklypoppy Argemone glauca (Nutt. ex Prain) Pope var. decipiens G.B. Ownbey ARGLD Papaveraceae
smooth pricklypoppy Argemone glauca (Nutt. ex Prain) Pope var. glauca ARGLG5 Papaveraceae
smooth rattlebox Crotalaria pallida Ait. CRPA10 Fabaceae
smooth rattlebox Crotalaria pallida Ait. var. obovata (G. Don) Polhill CRPAO Fabaceae
smooth rockcress Arabis laevigata (Muhl. ex Willd.) Poir. ARLA Brassicaceae
smooth rockcress Arabis laevigata (Muhl. ex Willd.) Poir. var. laevigata ARLAL Brassicaceae
smooth saltbush Atriplex pusilla (Torr. ex S. Wats.) S. Wats. ATPU2 Chenopodiaceae
smooth sawgrass Cladium mariscoides (Muhl.) Torr. CLMA Cyperaceae
smooth strongbark Bourreria cassinifolia (A. Rich.) Griseb. BOCA4 Boraginaceae
smooth yellow false foxglove Aureolaria flava (L.) Farw. AUFL Scrophulariaceae
smooth yellow false foxglove Aureolaria flava (L.) Farw. var. flava AUFLF Scrophulariaceae
smooth yellow false foxglove Aureolaria flava (L.) Farw. var. macrantha Pennell AUFLM Scrophulariaceae
smooth yellow nicker Caesalpinia culebrae (Britt. & P. Wilson) Alain CACU10 Fabaceae
smoothbeak sedge Carex integra Mackenzie CAIN10 Cyperaceae
smoothcone sedge Carex laeviconica Dewey CALA12 Cyperaceae
smoothseed pygmyweed Crassula solierii (C. Gay) Meigen CRSO4 Crassulaceae
smoothsheath sedge Carex laevivaginata (Kükenth.) Mackenzie CALA14 Cyperaceae
smoothstem sedge Carex laeviculmis Meinsh. CALA13 Cyperaceae
smotherweed Bassia All. BASSI Chenopodiaceae
snail orchid Comparettia falcata Poepp. & Endl. COFA2 Orchidaceae
snailfern Cochlidium Kaulfuss COCHL Grammitidaceae
snailseed Cocculus diversifolius DC. CODI Menispermaceae
snailwood Conostegia D. Don CONOS Melastomataceae
Snake canyon milkvetch Astragalus vallaris M.E. Jones ASVA3 Fabaceae
snake milkvetch Astragalus iodanthus S. Wats. var. diaphanoides Barneby ASIOD Fabaceae
Snake River cryptantha Cryptantha spiculifera (Piper) Payson CRSP4 Boraginaceae
Snake River milkvetch Astragalus purshii Dougl. ex Hook. var. ophiogenes (Barneby) Barneby ASPUO Fabaceae
snakecactus Bergerocactus Britt. & Rose BERGE Cactaceae
snakeroot Ageratina Spach AGERA2 Asteraceae
snakewood Condalia Cav. CONDA Rhamnaceae
snapdragon Antirrhinum L. ANTIR2 Scrophulariaceae
sneezeweed Achillea ptarmica L. ACPT Asteraceae
snow arnica Arnica frigida C.A. Mey. ex Iljin ARFR2 Asteraceae
snow arnica Arnica frigida C.A. Mey. ex Iljin ssp. frigida ARFRF3 Asteraceae
snow in summer Cerastium tomentosum L. CETO2 Caryophyllaceae
snow Indian paintbrush Castilleja nivea Pennell & Ownbey CANI8 Scrophulariaceae
snowball sand verbena Abronia fragrans Nutt. ex Hook. ABFR2 Nyctaginaceae
snowbrush ceanothus Ceanothus velutinus Dougl. ex Hook. CEVE Rhamnaceae
snowbrush ceanothus Ceanothus velutinus Dougl. ex Hook. var. velutinus CEVEV4 Rhamnaceae
snowbush Breynia disticha J.R. & G. Forst. BRDI8 Euphorbiaceae
snowdrop windflower Anemone sylvestris L. ANSY3 Ranunculaceae
snowline springparsley Cymopterus nivalis S. Wats. CYNI3 Apiaceae
snowlover Chionophila Benth. CHION2 Scrophulariaceae
snowparsley Cnidium Cusson ex Juss. CNIDI Apiaceae
Snowy River wattle Acacia boomanii Maiden ACBO4 Fabaceae
snowy thistle Cirsium occidentale (Nutt.) Jepson var. candidissimum (Greene) J.F. Macbr. CIOCC Asteraceae
soapbush Clidemia hirta (L.) D. Don CLHI3 Melastomataceae
soapbush Clidemia hirta (L.) D. Don var. hirta CLHIH2 Melastomataceae
soapplant Chlorogalum Kunth CHLOR3 Liliaceae
soft agrimony Agrimonia pubescens Wallr. AGPU Rosaceae
soft bindweed Convolvulus pilosellifolius Desr. [excluded] COPI7 Convolvulaceae
soft bird's-beak Cordylanthus mollis Gray COMO Scrophulariaceae
soft bird's-beak Cordylanthus mollis Gray ssp. mollis COMOM Scrophulariaceae
soft brome Bromus hordeaceus L. BRHO2 Poaceae
soft brome Bromus hordeaceus L. ssp. divaricatus (Bonnier & Layens) Kerguélen BRHOD Poaceae
soft brome Bromus hordeaceus L. ssp. hordeaceus BRHOH Poaceae
soft brome Bromus hordeaceus L. ssp. pseudothominii (P. Sm.) H. Scholz BRHOP Poaceae
soft brome Bromus hordeaceus L. ssp. thominei (Hardham ex Nyman) Braun-Blanquet BRHOT Poaceae
soft butterfly pea Centrosema molle Mart. ex Benth. CEMO5 Fabaceae
soft fox sedge Carex conjuncta Boott CACO13 Cyperaceae
soft goldenaster Chrysopsis pilosa Nutt. CHPI8 Asteraceae
soft greeneyes Berlandiera pumila (Michx.) Nutt. BEPU2 Asteraceae
soft greeneyes Berlandiera pumila (Michx.) Nutt. var. pumila BEPUP3 Asteraceae
soft thistle Cirsium carolinianum (Walt.) Fern. & Schub. CICA7 Asteraceae
soft western rosinweed Calycadenia mollis Gray CAMO4 Asteraceae
softleaf Indian paintbrush Castilleja mollis Pennell CAMO8 Scrophulariaceae
softleaf sedge Carex disperma Dewey CADI6 Cyperaceae
sola pith plant Aeschynomene aspera L. AEAS Fabaceae
Solano false bindweed Calystegia purpurata (Greene) Brummitt ssp. solanensis (Jepson) Brummitt CAPUS2 Convolvulaceae
soldier rockcress Arabis lemmonii S. Wats. var. depauperata (A. Nels. & Kennedy) Rollins ARLED Brassicaceae
soldier rockcress Arabis lemmonii S. Wats. var. drepanoloba (Greene) Rollins ARLED2 Brassicaceae
soldierwood Colubrina elliptica (Sw.) Briz. & Stern COEL2 Rhamnaceae
Soliman's croton Croton soliman Cham. & Schlecht. CRSO2 Euphorbiaceae
solitary milkvetch Astragalus solitarius M.E. Peck ASSO3 Fabaceae
Solomon's lily Arum palestinum Boiss. ARPA39 Araceae
Sonne's arnica Arnica parryi Gray ssp. sonnei (Greene) Maguire ARPAS2 Asteraceae
Sonoma ceanothus Ceanothus sonomensis J.T. Howell CESO Rhamnaceae
Sonoma clarkia Clarkia gracilis (Piper) A. Nels. & J.F. Macbr. ssp. sonomensis (C.L. Hitchc.) H.F. & M.E. Lewis CLGRS Onagraceae
Sonoma manzanita Arctostaphylos canescens Eastw. ssp. sonomensis (Eastw.) P.V. Wells ARCAS3 Ericaceae
Sonoma shortawn foxtail Alopecurus aequalis Sobol. var. sonomensis Rubtzoff ALAES Poaceae
Sonoma spineflower Chorizanthe valida S. Wats. CHVA Polygonaceae
Sonoran brickellbush Brickellia simplex Gray BRSI2 Asteraceae
Sonoran croton Croton sonorae Torr. CRSO Euphorbiaceae
Sonoran dodder Cuscuta erosa Yuncker CUER Cuscutaceae
Sonoran giant hyssop Agastache wrightii (Greenm.) Woot. & Standl. AGWR Lamiaceae
Sonoran Indian mallow Abutilon mollicomum (Willd.) Sweet ABMO2 Malvaceae
Sonoran pricklypoppy Argemone gracilenta Greene ARGR3 Papaveraceae
Sonoran sandmat Chamaesyce micromera (Boiss. ex Engelm.) Woot. & Standl. CHMI7 Euphorbiaceae
Sonoran silverbush Argythamnia brandegeei Millsp. ARBR3 Euphorbiaceae
Sonoran silverbush Argythamnia brandegeei Millsp. var. intonsa (I.M. Johnston) Ingram ex L.C. Wheeler ARBRI Euphorbiaceae
soot lichen Cyphelium Ach. CYPHE2 Caliciaceae
soot lichen Cyphelium brachysporum Nadv. CYBR12 Caliciaceae
soot lichen Cyphelium brunneum W. A. Weber CYBR13 Caliciaceae
soot lichen Cyphelium chloroconium (Tuck.) Zahlbr. CYCH6 Caliciaceae
soot lichen Cyphelium inquinans (Sm.) Trevisan CYIN10 Caliciaceae
soot lichen Cyphelium karelicum (Vainio) Rasanen CYKA10 Caliciaceae
soot lichen Cyphelium lucidum (Th. Fr.) Th. Fr. CYLU4 Caliciaceae
soot lichen Cyphelium pinicola Tibell CYPI7 Caliciaceae
soot lichen Cyphelium tigillare (Ach.) Ach. CYTI2 Caliciaceae
soot lichen Cyphelium trachylioides (Nyl. ex Branth & Rostrup) Erichsen CYTR9 Caliciaceae
sorrelvine Cissus trifoliata (L.) L. CITR2 Vitaceae
souari nut Caryocar nuciferum L. CANU12 Caryocaraceae
sour orange Citrus ×aurantium L. (pro sp.) [maxima × reticulata] CIAU8 Rutaceae
sour orange Citrus ×aurantium L. ssp. aurantium CIAUA Rutaceae
sour pricklypear Consolea rubescens (Salm-Dyck ex DC.) Lem. CORU8 Cactaceae
soursop Annona muricata L. ANMU2 Annonaceae
South American jelly palm Butia capitata (Mart.) Becc. BUCA15 Arecaceae
South American saltbush Atriplex lampa Gillies ex Moq. ATLA2 Chenopodiaceae
South Idaho onion Allium aaseae Ownbey ALAA Liliaceae
South Wales wattle Acacia parramattensis Tindale ACPA81 Fabaceae
southern amaranth Amaranthus australis (Gray) Sauer AMAU Amaranthaceae
southern blue monkshood Aconitum uncinatum L. ACUN Ranunculaceae
southern blue monkshood Aconitum uncinatum L. ssp. muticum (DC.) Hardin ACUNM Ranunculaceae
southern blue monkshood Aconitum uncinatum L. ssp. uncinatum ACUNU Ranunculaceae
southern bluethread Burmannia capitata (J.F. Gmel.) Mart. BUCA3 Burmanniaceae
southern catalpa Catalpa bignonioides Walt. CABI8 Bignoniaceae
southern colicroot Aletris obovata Nash ALOB3 Liliaceae
southern flatsedge Cyperus thyrsiflorus Jungh. CYTH Cyperaceae
southern Florida sandmat Chamaesyce adenoptera (Bertol.) Small CHAD Euphorbiaceae
southern Florida sandmat Chamaesyce adenoptera (Bertol.) Small ssp. pergamena (Small) Burch CHADP Euphorbiaceae
southern hawthorn Crataegus contrita Beadle CRCO13 Rosaceae
southern lipfern Cheilanthes microphylla (Sw.) Sw. CHMI4 Pteridaceae
southern long sedge Carex lonchocarpa Willd. CALO9 Cyperaceae
southern milkweed Asclepias viridula Chapman ASVI9 Asclepiadaceae
southern mountain misery Chamaebatia australis (Brandeg.) Abrams CHAU2 Rosaceae
southern mule-ears Agnorhiza ovata (Torr. & Gray ex Torr.) W.A. Weber AGOV Asteraceae
southern sandbur Cenchrus echinatus L. CEEC Poaceae
southern sedge Carex austrina Mackenzie CAAU6 Cyperaceae
southern shagbark hickory Carya carolinae-septentrionalis (Ashe) Engl. & Graebn. CACA38 Juglandaceae
southern Sierra pincushion Chaenactis alpigena C.W. Sharsmith CHAL Asteraceae
southern sugar maple Acer barbatum Michx. ACBA3 Aceraceae
southern suncup Camissonia bistorta (Nutt. ex Torr. & Gray) Raven CABI12 Onagraceae
southern threeawn Aristida simpliciflora Chapman ARSI3 Poaceae
southern waxy sedge Carex glaucescens Ell. CAGL5 Cyperaceae
southernwood Artemisia abrotanum L. ARAB2 Asteraceae
southwestern brickellbush Brickellia conduplicata (B.L. Robins.) B.L. Robins. BRCO7 Asteraceae
southwestern cosmos Cosmos parviflorus (Jacq.) Pers. COPA12 Asteraceae
southwestern cryptantha Cryptantha mensana (M.E. Jones) Payson CRME5 Boraginaceae
southwestern false cloak fern Argyrochosma limitanea (Maxon) Windham ARLI4 Pteridaceae
southwestern false cloak fern Argyrochosma limitanea (Maxon) Windham ssp. limitanea ARLIL Pteridaceae
southwestern false cloak fern Argyrochosma limitanea (Maxon) Windham ssp. mexicana (Maxon) Windham ARLIM Pteridaceae
southwestern needlegrass Achnatherum eminens (Cav.) Barkworth ACEM4 Poaceae
southwestern pricklypoppy Argemone pleiacantha Greene ARPL3 Papaveraceae
southwestern pricklypoppy Argemone pleiacantha Greene ssp. ambigua G.B. Ownbey ARPLA Papaveraceae
southwestern pricklypoppy Argemone pleiacantha Greene ssp. pinnatisecta G.B. Ownbey ARPLP Papaveraceae
southwestern pricklypoppy Argemone pleiacantha Greene ssp. pleiacantha ARPLP3 Papaveraceae
southwestern rabbitbrush Chrysothamnus pulchellus (Gray) Greene CHPU4 Asteraceae
southwestern ringstem Anulocaulis leiosolenus (Torr.) Standl. ANLE5 Nyctaginaceae
southwestern ringstem Anulocaulis leiosolenus (Torr.) Standl. var. lasianthus I.M. Johnston ANLEL Nyctaginaceae
southwestern ringstem Anulocaulis leiosolenus (Torr.) Standl. var. leiosolenus ANLEL2 Nyctaginaceae
southwestern showy sedge Carex bella Bailey CABE3 Cyperaceae
southwestern white pine dwarf mistletoe Arceuthobium blumeri A. Nels. ARBL3 Viscaceae
Soxman's milkvetch Astragalus soxmaniorum Lundell ASSO5 Fabaceae
spadeleaf Centella asiatica (L.) Urban CEAS Apiaceae
Spalding's milkvetch Astragalus spaldingii Gray ASSP4 Fabaceae
Spalding's orange lichen Caloplaca spaldingii Zahlbr. CASP21 Teloschistaceae
Spanish cedar Cedrela odorata L. CEOD Meliaceae
Spanish elm Cordia alliodora (Ruiz & Pavón) Oken COAL Boraginaceae
Spanish Needle onion Allium shevockii McNeal ALSH Liliaceae
Spanish needles Bidens bipinnata L. BIBI7 Asteraceae
sparrowegg lady's slipper Cypripedium passerinum Richards. CYPA5 Orchidaceae
sparseflower sedge Carex tenuiflora Wahlenb. CATE5 Cyperaceae
sparselobe grapefern Botrychium biternatum (Sav.) Underwood BOBI Ophioglossaceae
spathulate botrychium Botrychium spathulatum W.H. Wagner BOSP4 Ophioglossaceae
spear saltbush Atriplex patula L. ATPA4 Chenopodiaceae
spearhead Chlorocrambe hastata (S. Wats.) Rydb. CHHA Brassicaceae
spearleaf agoseris Agoseris retrorsa (Benth.) Greene AGRE Asteraceae
spearleaf arnica Arnica longifolia D.C. Eat. ARLO6 Asteraceae
spearleaf brickellbush Brickellia atractyloides Gray BRAT Asteraceae
spearleaf rabbitbrush Chrysothamnus linifolius Greene CHLI3 Asteraceae
spearwood Acacia doratoxylon A. Cunn. ACDO2 Fabaceae
speckled alder Alnus incana (L.) Moench ssp. rugosa (Du Roi) Clausen ALINR Betulaceae
speckled clarkia Clarkia cylindrica (Jepson) H.F. & M.E. Lewis CLCY Onagraceae
speckled clarkia Clarkia cylindrica (Jepson) H.F. & M.E. Lewis ssp. clavicarpa W.S. Davis CLCYC Onagraceae
speckled clarkia Clarkia cylindrica (Jepson) H.F. & M.E. Lewis ssp. cylindrica CLCYC2 Onagraceae
spectacular flatsedge Cyperus manimae Kunth CYMA4 Cyperaceae
spectacular flatsedge Cyperus manimae Kunth var. asperrimus (Liebm.) Kükenth. CYMAA Cyperaceae
spectacular flatsedge Cyperus spectabilis Link CYSP2 Cyperaceae
speenwort Asplenium caudatum G. Forst. ASCA41 Aspleniaceae
Sperry's milkweed Asclepias sperryi Woods. ASSP2 Asclepiadaceae
Sperry's onion Allium perdulce S.V. Fraser var. sperryi Ownbey ALPES Liliaceae
sphagnum absonditella lichen Absconditella sphagnorum Vezda & Poelt ABSP Stictidaceae
spider milkweed Asclepias asperula (Dcne.) Woods. ASAS Asclepiadaceae
spider milkweed Asclepias asperula (Dcne.) Woods. ssp. asperula ASASA Asclepiadaceae
spider plant Chlorophytum comosum (Thunb.) Jacq. CHCO28 Liliaceae
spiderflower Cleome L. CLEOM Capparaceae
spidergrass Aristida ternipes Cav. ARTE3 Poaceae
spidergrass Aristida ternipes Cav. var. gentilis (Henr.) Allred ARTEG Poaceae
spidergrass Aristida ternipes Cav. var. ternipes ARTET Poaceae
spiderling Boerhavia L. BOERH2 Nyctaginaceae
spiderweb chloris Chloris pycnothrix Trin. CHPY4 Poaceae
spiderwisp Cleome gynandra L. CLGY Capparaceae
spike bentgrass Agrostis exarata Trin. AGEX Poaceae
spike lichen Calicium abietinum Pers. CAAB12 Caliciaceae
spike lichen Calicium adspersum Pers. CAAD4 Caliciaceae
spike lichen Calicium chlorosporum F. Wilson CACH26 Caliciaceae
spike lichen Calicium corynellum (Ach.) Ach. CACO62 Caliciaceae
spike lichen Calicium glaucellum Ach. CAGL24 Caliciaceae
spike lichen Calicium hyperelloides Nyl. CAHY10 Caliciaceae
spike lichen Calicium lenticulare Ach. CALE39 Caliciaceae
spike lichen Calicium leucochlorum Tuck. CALE41 Caliciaceae
spike lichen Calicium parvum Tibell CAPA63 Caliciaceae
spike lichen Calicium Pers. CALIC Caliciaceae
spike lichen Calicium quercinum Pers. CAQU6 Caliciaceae
spike lichen Calicium salicinum Pers. CASA21 Caliciaceae
spike lichen Calicium trabinellum (Ach.) Ach. CATR20 Caliciaceae
spike lichen Calicium viride Pers. CAVI16 Caliciaceae
spike sedge Carex nardina Fries CANA2 Cyperaceae
spike sedge Carex nardina Fries var. nardina Fries [excluded] CANAN3 Cyperaceae
spiked centaury Centaurium spicatum (L.) Fritsch CESP3 Gentianaceae
spiked spiralflag Costus spicatus (Jacq.) Sw. COSP4 Costaceae
spiked western rosinweed Calycadenia spicata (Greene) Greene CASP2 Asteraceae
spiked wild indigo Baptisia albescens Small BAAL3 Fabaceae
spikenard Aralia L. ARALI Araliaceae
spikeoat Avenula hookeri (Scribn.) Holub AVHO3 Poaceae
spine acanthus Acanthus spinosus L. ACSP7 Acanthaceae
spineflower Chorizanthe R. Br. ex Benth. CHORI2 Polygonaceae
spineless hornwort Ceratophyllum echinatum Gray CEEC2 Ceratophyllaceae
spineless wattle Acacia muricata (L.) Willd. ACMU Fabaceae
spinescale saltbush Atriplex spinifera J.F. Macbr. ATSP Chenopodiaceae
spinster's blue eyed Mary Collinsia sparsiflora Fisch. & C.A. Mey. COSP Scrophulariaceae
spinster's blue eyed Mary Collinsia sparsiflora Fisch. & C.A. Mey. var. arvensis (Greene) Jepson COSPA Scrophulariaceae
spinster's blue eyed Mary Collinsia sparsiflora Fisch. & C.A. Mey. var. bruceae (M.E. Jones) Newsom COSPB Scrophulariaceae
spinster's blue eyed Mary Collinsia sparsiflora Fisch. & C.A. Mey. var. collina (Jepson) Newsom COSPC Scrophulariaceae
spinster's blue eyed Mary Collinsia sparsiflora Fisch. & C.A. Mey. var. sparsiflora COSPS Scrophulariaceae
spiny amaranth Amaranthus spinosus L. AMSP Amaranthaceae
spiny bucida Bucida molinetii (G. Maza) Alain BUMO Combretaceae
spiny chloracantha Chloracantha spinosa (Benth.) Nesom CHSP11 Asteraceae
spiny combretum Combretum obovatum F. Hoffm. COOB13 Combretaceae
spiny fiddlewood Citharexylum spinosum L. CISP3 Verbenaceae
spiny hackberry Celtis ehrenbergiana (Klotzsch) Liebm. CEEH Ulmaceae
spiny holdback Caesalpinia spinosa (Molina) Kuntze CASP11 Fabaceae
spiny milkvetch Astragalus kentrophyta Gray ASKE Fabaceae
spiny milkvetch Astragalus kentrophyta Gray var. danaus (Barneby) Barneby ASKED Fabaceae
spiny milkvetch Astragalus kentrophyta Gray var. jessiae (M.E. Peck) Barneby ASKEJ Fabaceae
spiny milkvetch Astragalus kentrophyta Gray var. kentrophyta ASKEK Fabaceae
spiny milkvetch Astragalus kentrophyta Gray var. ungulatus M.E. Jones ASKEU Fabaceae
spiny plumeless thistle Carduus acanthoides L. CAAC Asteraceae
spiny spiderflower Cleome spinosa Jacq. CLSP3 Capparaceae
spiny treefern Cyathea pungens (Willd.) Domin CYPU8 Cyatheaceae
spinycape Aristocapsa Reveal & Hardham ARIST4 Polygonaceae
spiral flag Costus villosissimus Jacq. COVI17 Costaceae
spiral ginger Costus pulverulentus C. Presl. COPU22 Costaceae
spiritweed Aegiphila Jacq. AEGIP Verbenaceae
Spitsberg orange lichen Caloplaca spitsbergensis H. Magn. CASP22 Teloschistaceae
spleen amaranth Amaranthus dubius Mart. ex Thellung AMDU Amaranthaceae
spleenwort Asplenium L. ASPLE Aspleniaceae
spleenwort cyanea Cyanea aspleniifolia (Mann) Hbd. CYAS2 Campanulaceae
splendid mariposa lily Calochortus splendens Dougl. ex Benth. CASP Liliaceae
splitawn sedge Carex tumulicola Mackenzie CATU3 Cyperaceae
splitbeard bluestem Andropogon ternarius Michx. ANTE2 Poaceae
splitbeard bluestem Andropogon ternarius Michx. var. cabanisii (Hack.) Fern. & Grisc. ANTEC Poaceae
splitbeard bluestem Andropogon ternarius Michx. var. ternarius ANTET Poaceae
splithair Indian paintbrush Castilleja schizotricha Greenm. CASC20 Scrophulariaceae
splitleaf brickellbush Brickellia laciniata Gray BRLA Asteraceae
splitleaf cyanea Cyanea cylindrocalyx (Rock) Lammers CYCY7 Campanulaceae
splitleaf cyanea Cyanea grimesiana Gaud. CYGR8 Campanulaceae
splitleaf cyanea Cyanea grimesiana Gaud. ssp. grimesiana CYGRG Campanulaceae
splitleaf cyanea Cyanea grimesiana Gaud. ssp. obatae (St. John) Lammers CYGRO Campanulaceae
splitleaf Indian paintbrush Castilleja rhexiifolia Rydb. CARH4 Scrophulariaceae
spoonleaf Bouchea spathulata Torr. BOSP2 Verbenaceae
spoonleaf cyanea Cyanea kahiliensis (St. John) Lammers CYKA11 Campanulaceae
spoonleaf cyanea Cyanea spathulata (Hbd.) Heller CYSP5 Campanulaceae
spoonleaf rockcress Arabis fendleri (S. Wats.) Greene var. spatifolia (Rydb.) Rollins ARFES Brassicaceae
spoonleaf treebine Cissus obovata Vahl CIOB Vitaceae
spoonsepal spineflower Chorizanthe obovata Goodman CHOB4 Polygonaceae
spoonwort Cochlearia officinalis L. [excluded] COOF4 Brassicaceae
spotflower Acmella L.C. Rich. ex Pers. ACMEL Asteraceae
spotted bellflower Campanula punctata Lam. CAPU20 Campanulaceae
spotted knapweed Centaurea stoebe L. CEST8 Asteraceae
spotted knapweed Centaurea stoebe L. ssp. micranthos (Gugler) Hayek CESTM Asteraceae
spotted lady's slipper Cypripedium guttatum Sw. CYGU Orchidaceae
spotted lady's slipper Cypripedium yatabeanum Makino CYYA Orchidaceae
spotted sandmat Chamaesyce maculata (L.) Small CHMA15 Euphorbiaceae
spotted signal grass Brachiaria nigropedata (Munro ex Ficalho & Hiern) Stapf BRNI5 Poaceae
spotted water hemlock Cicuta maculata L. CIMA2 Apiaceae
spotted water hemlock Cicuta maculata L. var. angustifolia Hook. CIMAA Apiaceae
spotted water hemlock Cicuta maculata L. var. bolanderi (S. Wats.) G. Mulligan CIMAB Apiaceae
spotted water hemlock Cicuta maculata L. var. maculata CIMAM Apiaceae
Sprague's eggyolk lichen Candelariella spraguei (Tuck.) Zahlbr. CASP23 Candelariaceae
spreading alkaliweed Cressa truxillensis Kunth CRTR5 Convolvulaceae
spreading amaranth Amaranthus crassipes Schlecht. AMCR Amaranthaceae
spreading amaranth Amaranthus crassipes Schlecht. var. crassipes AMCRC Amaranthaceae
spreading asphead Aspicarpa longipes Gray ASLO7 Malpighiaceae
spreading bellflower Campanula patula L. CAPA44 Campanulaceae
spreading chervil Chaerophyllum procumbens (L.) Crantz CHPR Apiaceae
spreading chervil Chaerophyllum procumbens (L.) Crantz var. procumbens CHPRP Apiaceae
spreading cotoneaster Cotoneaster divaricatus Rehd. & E.H. Wilson CODI19 Rosaceae
spreading dogbane Apocynum androsaemifolium L. APAN2 Apocynaceae
spreading hawthorn Crataegus disperma Ashe CRDI4 Rosaceae
spreading leastdaisy Chaetopappa effusa (Gray) Shinners CHEF Asteraceae
spreading rockcress Arabis patens Sullivant ARPA2 Brassicaceae
spreading sandmat Chamaesyce humistrata (Engelm. ex Gray) Small CHHU3 Euphorbiaceae
spreading sandwort Arenaria lanuginosa (Michx.) Rohrb. ARLA4 Caryophyllaceae
spreading sandwort Arenaria lanuginosa (Michx.) Rohrb. ssp. lanuginosa ARLAL2 Caryophyllaceae
spreading sandwort Arenaria lanuginosa (Michx.) Rohrb. ssp. lanuginosa var. lanuginosa ARLAL3 Caryophyllaceae
spreading sandwort Arenaria lanuginosa (Michx.) Rohrb. ssp. lanuginosa var. longipedunculata Duncan ARLAL4 Caryophyllaceae
spreading sandwort Arenaria lanuginosa (Michx.) Rohrb. ssp. saxosa (Gray) Maguire ARLAS Caryophyllaceae
spreading sedge Carex laxiculmis Schwein. CALA18 Cyperaceae
spreading sedge Carex laxiculmis Schwein. var. copulata (Bailey) Fern. CALAC Cyperaceae
spreading sedge Carex laxiculmis Schwein. var. laxiculmis CALAL4 Cyperaceae
spreading snakeroot Ageratina riparia (Regel) King & H.E. Robins. AGRI2 Asteraceae
spreading sneezeweed Centipeda minima (L.) A. Braun & Aschers. CEMI5 Asteraceae
spreading spiderflower Cleome diffusa Banks ex DC. CLDI4 Capparaceae
spreading spleenwort Asplenium patens Kaulfuss ASPA17 Aspleniaceae
spreading threeawn Aristida cognata Trin. & Rupr. ARCO10 Poaceae
spreading windmill grass Chloris divaricata R. Br. CHDI2 Poaceae
spreading yellow false foxglove Aureolaria patula (Chapman) Pennell AUPA Scrophulariaceae
spreadingpod rockcress Arabis ×divaricarpa A. Nels. (pro sp.) [drummondii × holboellii] ARDI2 Brassicaceae
Sprengel's sedge Carex sprengelii Dewey ex Spreng. CASP7 Cyperaceae
Sprenger's asparagus fern Asparagus densiflorus (Kunth) Jessop ASDE12 Liliaceae
spring biatora lichen Biatora vernalis (L.) Fr. BIVE60 Bacidiaceae
spring blue eyed Mary Collinsia verna Nutt. COVE2 Scrophulariaceae
spring coralroot Corallorhiza wisteriana Conrad COWI5 Orchidaceae
spring fumewort Corydalis solida (L.) Clairv. COSO6 Fumariaceae
Spring Mountain milkvetch Astragalus remotus (M.E. Jones) Barneby ASRE4 Fabaceae
spring pheasant's eye Adonis vernalis L. ADVE Ranunculaceae
spring thistle Cirsium vernale (Osterhout) Cockerell CIVE Asteraceae
springbeauty Claytonia L. CLAYT Portulacaceae
Springfield's beardgrass Bothriochloa springfieldii (Gould) Parodi BOSP3 Poaceae
spring-gold Crocidium Hook. CROCI Asteraceae
springloving centaury Centaurium namophilum Reveal, Broome & Beatley CENA Gentianaceae
springparsley Cymopterus Raf. CYMOP2 Apiaceae
Springville clarkia Clarkia springvillensis Vasek CLSP6 Onagraceae
sprouting broccoli Brassica oleracea L. var. italica Plenck BROLI Brassicaceae
spruce muskeg sedge Carex lugens Holm CALU2 Cyperaceae
sprucetop grama Bouteloua chondrosioides (Kunth) Benth. ex S. Wats. BOCH Poaceae
spurred butterfly pea Centrosema virginianum (L.) Benth. CEVI2 Fabaceae
squarestem Chrysothemis pulchella (Donn ex Sims) Dcne. CHPU9 Gesneriaceae
squarestem butterflybush Buddleja saligna Willd. BUSA Buddlejaceae
squarrose knapweed Centaurea virgata Lam. CEVI Asteraceae
squarrose knapweed Centaurea virgata Lam. ssp. squarrosa (Willd.) Gugler CEVIS2 Asteraceae
squarrose sedge Carex squarrosa L. CASQ2 Cyperaceae
St. Eustatius threeawn Aristida suringarii Henr. ARSU6 Poaceae
St. John's bread Ceratonia siliqua L. CESI3 Fabaceae
St. John's rollandia Cyanea st.-johnii (Hosaka) Lammers, Givnish & Systma CYST8 Campanulaceae
St. Mark's false foxglove Agalinis pulchella Pennell AGPU4 Scrophulariaceae
St. Thomas tree Bauhinia tomentosa L. BATO Fabaceae
staghorn cholla Cylindropuntia versicolor (Engelm. ex Coult.) F.M. Knuth CYVE3 Cactaceae
staining collomia Collomia tinctoria Kellogg COTI2 Polemoniaceae
stalked maidenhair Adiantum petiolatum Desv. ADPE3 Pteridaceae
stalked moonwort Botrychium pedunculosum W.H. Wagner BOPE4 Ophioglossaceae
stalked saltbush Atriplex argentea Nutt. ssp. argentea var. caput-medusae (Eastw.) Fosberg ATARC2 Chenopodiaceae
stalkgrain sedge Carex stipata Muhl. ex Willd. var. maxima Chapman CASTM Cyperaceae
standing milkvetch Astragalus laxmannii Jacq. var. tananaicus (Hultén) Barneby & Welsh ASLAT3 Fabaceae
Standley's goosefoot Chenopodium standleyanum Aellen CHST2 Chenopodiaceae
Stanford orange lichen Caloplaca stanfordensis H. Magn. CAST43 Teloschistaceae
Stanford's manzanita Arctostaphylos stanfordiana Parry ARST Ericaceae
Stanford's manzanita Arctostaphylos stanfordiana Parry ssp. stanfordiana ARSTS Ericaceae
star apple Chrysophyllum cainito L. CHCA10 Sapotaceae
star campylium moss Campylium stellatum (Hedw.) C. Jens. CAST51 Amblystegiaceae
star campylium moss Campylium stellatum (Hedw.) C. Jens. var. protensum (Brid.) Bryhn CASTP Amblystegiaceae
star campylium moss Campylium stellatum (Hedw.) C. Jens. var. stellatum CASTS7 Amblystegiaceae
star coccocarpia lichen Coccocarpia stellata Tuck. COST15 Coccocarpiaceae
star reindeer lichen Cladina stellaris (Opiz) Brodo CLST60 Cladoniaceae
star reindeer lichen Cladina stellaris (Opiz) Brodo var. aberrans (Abbayes) Ahti CLSTA Cladoniaceae
star sedge Carex echinata Murr. CAEC Cyperaceae
star sedge Carex echinata Murr. ssp. echinata CAECE Cyperaceae
star sedge Carex echinata Murr. ssp. phyllomanica (W. Boott) Reznicek CAECP Cyperaceae
star tickseed Coreopsis pubescens Ell. COPU2 Asteraceae
star tickseed Coreopsis pubescens Ell. var. debilis (Sherff) E.B. Sm. COPUD Asteraceae
star tickseed Coreopsis pubescens Ell. var. pubescens COPUP Asteraceae
star tickseed Coreopsis pubescens Ell. var. robusta Gray ex Eames COPUR Asteraceae
starburr Acanthospermum Schrank ACANT3 Asteraceae
starflower brodiaea Brodiaea stellaris S. Wats. BRST Liliaceae
stargrass Cynodon plectostachyus (K. Schum.) Pilger CYPL2 Poaceae
Starke's brachythecium moss Brachythecium starkei (Brid.) Schimp. in B.S.G. BRST4 Brachytheciaceae
starleaf begonia Begonia heracleifolia Cham. & Schlecht. BEHE2 Begoniaceae
starlet spineflower Chorizanthe stellulata Benth. CHST5 Polygonaceae
star-mustard Coincya monensis (L.) Greuter & Burdet COMO9 Brassicaceae
star-mustard Coincya monensis (L.) Greuter & Burdet ssp. recurvata (All.) Leadley COMOR Brassicaceae
star-mustard Coincya Rouy COINC Brassicaceae
starveling milkvetch Astragalus jejunus S. Wats. ASJE2 Fabaceae
starveling milkvetch Astragalus jejunus S. Wats. var. articulatus Dorn ASJEA Fabaceae
starveling milkvetch Astragalus jejunus S. Wats. var. jejunus ASJEJ Fabaceae
starvine Brandegea Cogn. BRAND Cucurbitaceae
Stebbins' false bindweed Calystegia stebbinsii Brummitt CAST21 Convolvulaceae
Steen Mountain thistle Cirsium peckii Henderson CIPE4 Asteraceae
Steenes Indian paintbrush Castilleja pilosa (S. Wats.) Rydb. var. steenensis (Pennell) N. Holmgren CAPIS Scrophulariaceae
stellate sedge Carex albicans Willd. ex Spreng. var. australis (Bailey) J. Rettig CAALA2 Cyperaceae
stemless Indian parsley Aletes acaulis (Torr.) Coult. & Rose ALAC2 Apiaceae
Stevens' lambsquarters Chenopodium album L. var. stevensii Aellen CHALS Chenopodiaceae
Steven's sedge Carex norvegica Retz. ssp. stevenii (Holm) E. Murr. CANOS Cyperaceae
Steve's dustymaiden Chaenactis stevioides Hook. & Arn. CHST Asteraceae
stickbush Clerodendrum chinense (Osb.) Mabberley CLCH4 Verbenaceae
stickpea Calliandra Benth. CALLI Fabaceae
stickpea Calliandra haematocephala Hassk. CAHA31 Fabaceae
sticky blue eyed Mary Collinsia rattanii Gray CORA2 Scrophulariaceae
sticky blue eyed Mary Collinsia rattanii Gray ssp. glandulosa (T.J. Howell) Pennell CORAG Scrophulariaceae
sticky blue eyed Mary Collinsia rattanii Gray ssp. rattanii CORAR Scrophulariaceae
sticky centaury Centaurium glanduliferum (Correll) B.L. Turner CEGL6 Gentianaceae
sticky chickweed Cerastium glomeratum Thuill. CEGL2 Caryophyllaceae
sticky Chinese houses Collinsia tinctoria Hartw. ex Benth. COTI Scrophulariaceae
sticky false gilyflower Allophyllum glutinosum (Benth.) A.& V. Grant ALGL3 Polemoniaceae
sticky flatsedge Cyperus trachysanthos Hook. & Arn. CYTR2 Cyperaceae
sticky gilia Aliciella pinnatifida (Nutt. ex Gray) J.M. Porter ALPI2 Polemoniaceae
sticky Indian paintbrush Castilleja viscidula Gray CAVI9 Scrophulariaceae
sticky jointvetch Aeschynomene viscidula Michx. AEVI Fabaceae
sticky snakeroot Ageratina adenophora (Spreng.) King & H.E. Robins. AGAD2 Asteraceae
sticky wattle Acacia howittii F. Muell. ACHO5 Fabaceae
sticky waxweed Cuphea glutinosa Cham. & Schlecht. CUGL4 Lythraceae
sticky western rosinweed Calycadenia multiglandulosa DC. CAMU3 Asteraceae
sticky whiteleaf manzanita Arctostaphylos viscida Parry ARVI4 Ericaceae
sticky whiteleaf manzanita Arctostaphylos viscida Parry ssp. pulchella (T.J. Howell) P.V. Wells ARVIP2 Ericaceae
sticky whiteleaf manzanita Arctostaphylos viscida Parry ssp. viscida ARVIV Ericaceae
stickyseed Blennosperma Less. BLENN Asteraceae
stiff bluestar Amsonia rigida Shuttlw. ex Small AMRI Apocynaceae
stiff dogwood Cornus foemina P. Mill. COFO Cornaceae
stiff sedge Carex biltmoreana Mackenzie CABI9 Cyperaceae
stiff tickseed Coreopsis palmata Nutt. COPA10 Asteraceae
stiff yellow Indian paintbrush Castilleja lutescens (Greenm.) Rydb. CALU14 Scrophulariaceae
stiffbranch bird's beak Cordylanthus rigidus (Benth.) Jepson CORI2 Scrophulariaceae
stiffbranch bird's beak Cordylanthus rigidus (Benth.) Jepson ssp. brevibracteatus (Gray) Munz CORIB Scrophulariaceae
stiffbranch bird's beak Cordylanthus rigidus (Benth.) Jepson ssp. rigidus CORIR Scrophulariaceae
stiffbranch bird's beak Cordylanthus rigidus (Benth.) Jepson ssp. setigerus Chuang & Heckard CORIS2 Scrophulariaceae
stiffhair waxweed Cuphea strigulosa Kunth CUST4 Lythraceae
stiffleaf false foxglove Agalinis strictifolia (Benth.) Pennell AGST4 Scrophulariaceae
stiffleaf scratchdaisy Croptilon rigidifolium (E.B. Sm.) E.B. Sm. CRRI3 Asteraceae
Stilling's disc lichen Buellia stillingiana J. Steiner BUST5 Physciaceae
Stillman's needlegrass Achnatherum stillmanii (Bolander) Barkworth ACST7 Poaceae
Stillman's tickseed Coreopsis stillmanii (Gray) Blake COST3 Asteraceae
stinging serpent Cevallia Lag. CEVAL Loasaceae
stinging serpent Cevallia sinuata Lag. CESI Loasaceae
stinking brickellbush Brickellia rusbyi Gray BRRU Asteraceae
stinking chamomile Anthemis cotula L. ANCO2 Asteraceae
stinking goosefoot Chenopodium vulvaria L. CHVU Chenopodiaceae
stinking hawksbeard Crepis foetida L. CRFO2 Asteraceae
stinking hawksbeard Crepis foetida L. var. foetida CRFOF Asteraceae
stinking milkvetch Astragalus praelongus Sheldon ASPR5 Fabaceae
stinking milkvetch Astragalus praelongus Sheldon var. lonchopus Barneby ASPRL Fabaceae
stinking milkvetch Astragalus praelongus Sheldon var. praelongus ASPRP2 Fabaceae
stinkweed Cleomella DC. CLEOM2 Capparaceae
Stirton's bryum moss Bryum stirtonii Schimp. BRST6 Bryaceae
stolonbearing hawthorn Crataegus iracunda Beadle CRIR Rosaceae
stoloniferous pussytoes Antennaria dioica (L.) Gaertn. ANDI3 Asteraceae
stonecrop gilia Aliciella sedifolia (Brandeg.) J.M. Porter ALSE11 Polemoniaceae
stoneroot Collinsonia verticillata Baldw. COVE3 Lamiaceae
stonewood Callistemon salignus (Sm.) Sweet CASA34 Myrtaceae
storehousebush Cudrania tricuspidata (Carr.) Bureau ex Lavallée CUTR2 Moraceae
storm sedge Carex onusta Mackenzie CAON2 Cyperaceae
straggler daisy Calyptocarpus vialis Less. CAVI2 Asteraceae
straight lineleaf fern Antrophyum lanceolatum (L.) Kaulfuss ANLA8 Vittariaceae
strap airplant Catopsis Griseb. CATOP Bromeliaceae
strapfern Campyloneurum K. Presl CAMPY Polypodiaceae
strapwort Corrigiola litoralis L. COLI6 Caryophyllaceae
strawberry tree Arbutus unedo L. ARUN4 Ericaceae
strawcolored flatsedge Cyperus strigosus L. CYST Cyperaceae
streaked burr ragweed Ambrosia linearis (Rydb.) Payne AMLI3 Asteraceae
streambank bittercress Cardamine micranthera Rollins CAMI19 Brassicaceae
streambank copperleaf Acalypha bisetosa Bertol. ex Spreng. ACBI3 Euphorbiaceae
streambank cyanea Cyanea longissima (Rock) St. John CYLO7 Campanulaceae
streambank flowering fern Anemia hirta (L.) Sw. ANHI3 Anemiaceae
streambank lipfern Cheilanthes paupercula (Kunze) Mett. CHPA36 Pteridaceae
streambank springbeauty Claytonia parviflora Dougl. ex Hook. CLPA5 Portulacaceae
streambank springbeauty Claytonia parviflora Dougl. ex Hook. ssp. grandiflora J.M. Miller & K. Chambers CLPAG4 Portulacaceae
streambank springbeauty Claytonia parviflora Dougl. ex Hook. ssp. parviflora CLPAP Portulacaceae
streambank springbeauty Claytonia parviflora Dougl. ex Hook. ssp. utahensis (Rydb.) J.M. Miller & K. Chambers CLPAU2 Portulacaceae
streambank springbeauty Claytonia parviflora Dougl. ex Hook. ssp. viridis (A. Davids.) J.M. Miller & K. Chambers CLPAV Portulacaceae
stream-bed cyanea Cyanea habenata (St. John) Lammers CYHA13 Campanulaceae
streamside bryum moss Bryum riparium Hag. BRRI6 Bryaceae
striped garlic Allium cuthbertii Small ALCU Liliaceae
striped hawksbeard Crepis zacintha (L.) Babcock CRZA2 Asteraceae
striped maple Acer pensylvanicum L. ACPE Aceraceae
striped prince's pine Chimaphila maculata (L.) Pursh CHMA3 Pyrolaceae
strongbark Bourreria P. Br. BOURR Boraginaceae
stunted she-oak Allocasuarina nana (Sieber ex Spreng.) L. A. S. Johnson ALNA4 Casuarinaceae
sturdy sedge Carex alma Bailey CAAL7 Cyperaceae
Sturt's cassia Cassia sturtii R. Br. CAST47 Fabaceae
subalpine cryptantha Cryptantha crymophila I.M. Johnston CRCR5 Boraginaceae
subalpine fir Abies lasiocarpa (Hook.) Nutt. ABLA Pinaceae
subalpine fir Abies lasiocarpa (Hook.) Nutt. var. lasiocarpa ABLAL Pinaceae
subalpine mariposa lily Calochortus subalpinus Piper CASU2 Liliaceae
subarctic ladyfern Athyrium filix-femina (L.) Roth ssp. angustum (Willd.) Clausen ATFIA Dryopteridaceae
subarctic ladyfern Athyrium filix-femina (L.) Roth ssp. cyclosorum (Rupr.) C. Christens. ATFIC Dryopteridaceae
subcongesta sandwort Arenaria congesta Nutt. var. subcongesta (S. Wats.) S. Wats. ARCOS2 Caryophyllaceae
submersed rimmed lichen Aspicilia submersa (Lamy) Hue ASSU20 Hymeneliaceae
succulent owl's-clover Castilleja campestris (Benth.) Chuang & Heckard ssp. succulenta (Hoover) Chuang & Heckard CACAS5 Scrophulariaceae
suffrutescent sandwort Arenaria congesta Nutt. var. suffrutescens (Gray) B.L. Robins. ARCOS3 Caryophyllaceae
sugar apple Annona squamosa L. ANSQ Annonaceae
sugar maple Acer saccharum Marsh. ACSA3 Aceraceae
sugar maple Acer saccharum Marsh. var. saccharum ACSAS Aceraceae
sugar maple Acer saccharum Marsh. var. schneckii Rehd. ACSAS2 Aceraceae
sugar palm Arenga pinnata (Wurmb) Merr. ARPI6 Arecaceae
sugar pine dwarf mistletoe Arceuthobium californicum Hawksworth & Wiens ARCA17 Viscaceae
sugarberry Celtis laevigata Willd. CELA Ulmaceae
sugarberry Celtis laevigata Willd. var. brevipes (S. Wats.) Sarg. CELAB Ulmaceae
sugarberry Celtis laevigata Willd. var. laevigata CELAL Ulmaceae
sugarstick Allotropa Torr. & Gray ALLOT Monotropaceae
sugarstick Allotropa virgata Torr. & Gray ex Gray ALVI2 Monotropaceae
Suisun thistle Cirsium hydrophilum (Greene) Jepson CIHY Asteraceae
Suisun thistle Cirsium hydrophilum (Greene) Jepson var. hydrophilum CIHYH Asteraceae
Suksdorf's brome Bromus suksdorfii Vasey BRSU2 Poaceae
Suksdorf's hawthorn Crataegus suksdorfii (Sarg.) Kruschke CRSU16 Rosaceae
Suksdorf's Indian paintbrush Castilleja suksdorfii Gray CASU11 Scrophulariaceae
Suksdorf's large camas Camassia leichtlinii (Baker) S. Wats. ssp. suksdorfii (Greenm.) Gould CALES2 Liliaceae
Suksdorf's milkvetch Astragalus pulsiferae Gray var. suksdorfii (T.J. Howell) Barneby ASPUS Fabaceae
sulphur cosmos Cosmos sulphureus Cav. COSU5 Asteraceae
sulphur cup lichen Cladonia sulphurina (Michaux) Fr. CLSU64 Cladoniaceae
sulphur Indian paintbrush Castilleja sulphurea Rydb. CASU12 Scrophulariaceae
sulphur knapweed Centaurea sulphurea Willd. CESU Asteraceae
sulphur marsh marigold Caltha leptosepala DC. ssp. leptosepala var. sulfurea C.L. Hitchc. CALES4 Ranunculaceae
sulphur sedge Carex lutea LeBlond CALU26 Cyperaceae
summer coralroot Corallorhiza maculata (Raf.) Raf. COMA25 Orchidaceae
summer coralroot Corallorhiza maculata (Raf.) Raf. var. maculata COMAM7 Orchidaceae
summer coralroot Corallorhiza maculata (Raf.) Raf. var. occidentalis (Lindl.) Ames COMAO5 Orchidaceae
summer holly Comarostaphylis diversifolia (Parry) Greene CODI3 Ericaceae
summer holly Comarostaphylis diversifolia (Parry) Greene ssp. diversifolia CODID2 Ericaceae
summer holly Comarostaphylis diversifolia (Parry) Greene ssp. planifolia (Jepson) G. Wallace ex Thorne CODIP Ericaceae
summer holly Comarostaphylis Zucc. COMAR Ericaceae
summer milkvetch Astragalus hyalinus M.E. Jones ASHY2 Fabaceae
summer pheasant's eye Adonis aestivalis L. ADAE Ranunculaceae
summer sedge Carex aestivalis M.A. Curtis ex Gray CAAE2 Cyperaceae
summergrass Alloteropsis cimicina (L.) Stapf ALCI3 Poaceae
summergrass Alloteropsis J. Presl ALLOT2 Poaceae
sun sedge Carex inops Bailey ssp. heliophila (Mackenzie) Crins CAINH2 Cyperaceae
sunbonnetts Chaptalia Vent. CHAPT Asteraceae
suncup Camissonia Link CAMIS Onagraceae
sundrops Calylophus Spach CALYL Onagraceae
sunn hemp Crotalaria juncea L. CRJU Fabaceae
supplejack Berchemia Neck. ex DC. BERCH Rhamnaceae
surf thistle Cirsium rhothophilum Blake CIRH Asteraceae
Surinam campylopus moss Campylopus surinamensis C. Müll. CASU56 Dicranaceae
Surinamese stickpea Calliandra surinamensis Benth. CASU33 Fabaceae
Susanville milkvetch Astragalus inversus M.E. Jones ASIN7 Fabaceae
Sutherland hawthorn Crataegus sutherlandensis Sarg. CRSU6 Rosaceae
Svenson's beggarticks Bidens hyperborea Greene var. svensonii Fassett BIHYS Asteraceae
Swallen's needlegrass Achnatherum swallenii (C.L. Hitchc. & Spellenberg) Barkworth ACSW3 Poaceae
swallow-wort Cynanchum L. CYNAN Asclepiadaceae
swamp bellflower Campanula californica (Kellogg) Heller CACA7 Campanulaceae
swamp carex Carex senta Boott CASE Cyperaceae
swamp flatsedge Cyperus distinctus Steud. CYDI8 Cyperaceae
swamp leather flower Clematis crispa L. CLCR Ranunculaceae
swamp milkweed Asclepias incarnata L. ASIN Asclepiadaceae
swamp milkweed Asclepias incarnata L. ssp. incarnata ASINI Asclepiadaceae
swamp milkweed Asclepias incarnata L. ssp. pulchra (Ehrh. ex Willd.) Woods. ASINP2 Asclepiadaceae
swamp onion Allium madidum S. Wats. ALMA6 Liliaceae
swamp pricklegrass Crypsis schoenoides (L.) Lam. CRSC Poaceae
swamp sawgrass Cladium mariscus (L.) Pohl CLMA10 Cyperaceae
swamp stonecrop Crassula helmsii A. Berger CRHE5 Crassulaceae
swamp thistle Cirsium muticum Michx. CIMU Asteraceae
swamp titi Cyrilla racemiflora L. CYRA Cyrillaceae
swamp wallaby grass Amphibromus scabrivalvis (Trin.) Swallen AMSC4 Poaceae
swampforest clermontia Clermontia waimeae Rock CLWA2 Campanulaceae
swamplily Crinum L. CRINU Liliaceae
swamp-oak Casuarina obesa Miq. CAOB12 Casuarinaceae
swanflower Aristolochia erecta L. ARER Aristolochiaceae
Swan's sedge Carex swanii (Fern.) Mackenzie CASW Cyperaceae
Swartz's flatsedge Cyperus swartzii (A. Dietr.) Boeckl. ex Kükenth. CYSW Cyperaceae
Swartz's jamaican broom Chamaecrista glandulosa (L.) Greene var. swartzii (Wikstr.) Irwin & Barneby CHGLS Fabaceae
Swartz's pigeonplum Coccoloba swartzii Meisn. COSW Polygonaceae
Swartz's threeawn Aristida swartziana Steud. ARSW Poaceae
sweet acacia Acacia farnesiana (L.) Willd. ACFA Fabaceae
sweet acacia Acacia suaveolens (Sm.) Willd. ACSU9 Fabaceae
sweet after death Achlys triphylla (Sm.) DC. ACTR Berberidaceae
sweet autumn virginsbower Clematis terniflora DC. CLTE4 Ranunculaceae
sweet autumn virginsbower Clematis terniflora DC. var. terniflora CLTET2 Ranunculaceae
sweet birch Betula lenta L. BELE Betulaceae
sweet boronia Boronia megastigma Nees ex Bartling BOME3 Rutaceae
sweet fern Comptonia L'Hér. ex Ait. COMPT Myricaceae
sweet fern Comptonia peregrina (L.) Coult. COPE80 Myricaceae
sweet orange Citrus ×sinensis (L.) Osbeck (pro sp.) [maxima × reticulata] CISI3 Rutaceae
sweet sagewort Artemisia annua L. ARAN3 Asteraceae
sweet signalgrass Brachiaria eruciformis (Sm.) Griseb. BRER Poaceae
sweet vernalgrass Anthoxanthum odoratum L. ANOD Poaceae
sweet vernalgrass Anthoxanthum odoratum L. ssp. odoratum ANODO2 Poaceae
sweet woodreed Cinna arundinacea L. CIAR2 Poaceae
sweetbush Bebbia Greene BEBBI Asteraceae
sweetbush Bebbia juncea (Benth.) Greene BEJU Asteraceae
sweetbush Bebbia juncea (Benth.) Greene var. aspera Greene BEJUA Asteraceae
sweetbush Bebbia juncea Greene var. juncea Greene [excluded] BEJUJ2 Asteraceae
sweetflag Acorus americanus (Raf.) Raf. ACAM Acoraceae
sweetflag Acorus L. ACORU Acoraceae
sweetflower rockjasmine Androsace chamaejasme Wulfen ANCH Primulaceae
sweetflower rockjasmine Androsace chamaejasme Wulfen ssp. carinata (Torr.) Hultén ANCHC Primulaceae
sweet-Nancy Achillea ageratum L. ACAG3 Asteraceae
sweetpepperbush Clethra L. CLETH Clethraceae
sweetpitted grass Bothriochloa insculpta (Hochst.) A. Camus [excluded] BOIN6 Poaceae
sweetpotato cactus Cereus P. Mill. CEREU Cactaceae
sweetroot springparsley Cymopterus newberryi (S. Wats.) M.E. Jones CYNE Apiaceae
sweetscented pigeonwings Clitoria fragrans Small CLFR2 Fabaceae
sweetshrub Calycanthus L. CALYC5 Calycanthaceae
sweetsultan Amberboa moschata (L.) DC. AMMO Asteraceae
swinecress Coronopus Zinn CORON3 Brassicaceae
switchcane Arundinaria gigantea (Walt.) Muhl. ssp. tecta (Walt.) McClure ARGIT8 Poaceae
swollen fingergrass Chloris barbata Sw. CHBA10 Poaceae
sword jackbean Canavalia gladiata (Jacq.) DC. CAGL15 Fabaceae
sycamore maple Acer pseudoplatanus L. ACPS Aceraceae
Sydney golden wattle Acacia longifolia (Andr.) Willd. ACLO Fabaceae
Syrian acanthus Acanthus syriacus Boiss. ACSY Acanthaceae
Syrian cephalaria Cephalaria syriaca (L.) Scrad. ex Roemer & J.A. Schultes CESY Dipsacaceae
Syrian knapweed Centaurea babylonica (L.) L. CEBA4 Asteraceae
Szechuan white birch Betula szechuanica (Schneid.) C.A. Jansson BESZ Betulaceae
Szowits' madwort Alyssum szovitsianum Fisch. & C.A. Mey. ALSZ2 Brassicaceae

Source:  U. S. Department of Agriculture

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