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Plant List
Indexed Alphabetically by Common Name
L-M
For a list of plants indexed by Scientific Name, click here
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| National Common Name | Scientific Name with Author | Symbol | Family | |
| La Cruz manzanita | Arctostaphylos cruzensis J.B. Roof | ARCR6 | Ericaceae | |
| la graciosa thistle | Cirsium loncholepis Petrak | CILO | Asteraceae | |
| La Panza manzanita | Arctostaphylos pilosula Jepson & Wies. ex Jepson | ARPI | Ericaceae | |
| La Purissima manzanita | Arctostaphylos purissima P.V. Wells | ARPU10 | Ericaceae | |
| Labrador bryum moss | Bryum longisetum Bland. ex Schwaegr. var. labradorense (Philib.) C. Jens. | BRLOL2 | Bryaceae | |
| Labrador cup lichen | Cladonia labradorica Ahti & Brodo | CLLA8 | Cladoniaceae | |
| Labrador Indian paintbrush | Castilleja septentrionalis Lindl. | CASE4 | Scrophulariaceae | |
| lace lipfern | Cheilanthes gracillima D.C. Eat. | CHGR | Pteridaceae | |
| lacefern | Aspidotis (Nutt. ex Hook.) Copeland | ASPID2 | Pteridaceae | |
| lacefern | Ctenitis (C. Christens.) C. Christens. ex Tardieu-Blot & C. Christens | CTENI2 | Dryopteridaceae | |
| laceleaf | Anthurium Schott | ANTHU | Araceae | |
| Lackschewitz's milkvetch | Astragalus lackschewitzii Lavin & H. Marriott | ASLA26 | Fabaceae | |
| lacy spleenwort | Asplenium horridum Kaulfuss | ASHO4 | Aspleniaceae | |
| lacy thistle | Cirsium modestum (Osterhout) Cockerell | CIMO2 | Asteraceae | |
| ladies'-tresses | Cyclopogon K. Presl | CYCLO5 | Orchidaceae | |
| Lady Bird's centaury | Centaurium texense (Griseb.) Fern. | CETE2 | Gentianaceae | |
| lady of the night cactus | Cereus hexagonus (L.) P. Mill. | CEHE3 | Cactaceae | |
| lady of the night orchid | Brassavola nodosa (L.) Lindl. | BRNO3 | Orchidaceae | |
| ladyfern | Athyrium Roth | ATHYR | Dryopteridaceae | |
| lady's mantle | Alchemilla L. | ALCHE | Rosaceae | |
| lady's nightcap | Bonamia Thouars | BONAM | Convolvulaceae | |
| lady's slipper | Cypripedium L. | CYPRI | Orchidaceae | |
| lady's-mantle | Alchemilla mollis (Buser) Rothm. | ALMO12 | Rosaceae | |
| Lahontan milkvetch | Astragalus porrectus S. Wats. | ASPO3 | Fabaceae | |
| Lake Almanor clarkia | Clarkia stellata Mosquin | CLST3 | Onagraceae | |
| Lake Ella hawthorn | Crataegus integra Beadle | CRIN18 | Rosaceae | |
| lakeshore sedge | Carex lenticularis Michx. | CALE8 | Cyperaceae | |
| lakeshore sedge | Carex lenticularis Michx. var. impressa (Bailey) L.A. Standley | CALEI | Cyperaceae | |
| lakeshore sedge | Carex lenticularis Michx. var. lenticularis | CALEL | Cyperaceae | |
| lakeshore sedge | Carex lenticularis Michx. var. limnophila (Holm) Cronq. | CALEL2 | Cyperaceae | |
| lamb succory | Arnoseris minima (L.) Schweig. & Koerte | ARMI3 | Asteraceae | |
| lambsquarters | Chenopodium album L. | CHAL7 | Chenopodiaceae | |
| lambsquarters | Chenopodium album L. var. album | CHALA | Chenopodiaceae | |
| lambsquarters | Chenopodium album L. var. microphyllum Boenn. | CHALM | Chenopodiaceae | |
| lamilla | Bouteloua juncea (Desv. ex Beauv.) A.S. Hitchc. | BOJU | Poaceae | |
| lanate balsamroot | Balsamorhiza lanata (Sharp) W.A. Weber | BALA8 | Asteraceae | |
| lance asplenium | Asplenium ruta-muraria L. var. lanceolum Christ | ASRUL | Aspleniaceae | |
| lanceleaf anoda | Anoda lanceolata Hook. & Arn. | ANLA4 | Malvaceae | |
| lanceleaf arnica | Arnica lanceolata Nutt. | ARLA7 | Asteraceae | |
| lanceleaf browneyes | Camissonia claviformis (Torr. & Frém.) Raven ssp. lancifolia (Heller) Raven | CACLL | Onagraceae | |
| lanceleaf cyanea | Cyanea lanceolata (Gaud.) Lammers, Givnish & Sytsma | CYLA12 | Campanulaceae | |
| lanceleaf grapefern | Botrychium lanceolatum (Gmel.) Angstr. | BOLA | Ophioglossaceae | |
| lanceleaf grapefern | Botrychium lanceolatum (Gmel.) Angstr. var. angustisegmentum Pease & Moore | BOLAA2 | Ophioglossaceae | |
| lanceleaf grapefern | Botrychium lanceolatum (Gmel.) Angstr. var. lanceolatum | BOLAL | Ophioglossaceae | |
| lanceleaf ragweed | Ambrosia bidentata Michx. | AMBI2 | Asteraceae | |
| lanceleaf rattlebox | Crotalaria lanceolata E. Mey. | CRLA7 | Fabaceae | |
| lanceleaf springbeauty | Claytonia flava A. Nels. | CLFL3 | Portulacaceae | |
| lanceleaf springbeauty | Claytonia lanceolata Pall. ex Pursh | CLLA2 | Portulacaceae | |
| lanceleaf springbeauty | Claytonia lanceolata Pall. ex Pursh var. chrysantha (Greene) C.L. Hitchc. | CLLAC | Portulacaceae | |
| lanceleaf springbeauty | Claytonia lanceolata Pall. ex Pursh var. lanceolata | CLLAL | Portulacaceae | |
| lanceleaf springbeauty | Claytonia lanceolata Pall. ex Pursh var. sessilifolia (Torr.) A. Nels. | CLLAS | Portulacaceae | |
| lanceleaf springbeauty | Claytonia multiscapa Rydb. | CLMU5 | Portulacaceae | |
| lanceleaf thorow wax | Bupleurum lancifolium Hornem. | BULA3 | Apiaceae | |
| lanceleaf tickseed | Coreopsis lanceolata L. | COLA5 | Asteraceae | |
| lanceleaf water plantain | Alisma lanceolatum Withering | ALLA2 | Alismataceae | |
| Lane Mountain milkvetch | Astragalus jaegerianus Munz | ASJA | Fabaceae | |
| Langsdorf's copaifera | Copaifera langsdorfii Desf. | COLA14 | Fabaceae | |
| lapalapa | Cheirodendron platyphyllum (Hook. & Arn.) Seem. | CHPL | Araliaceae | |
| lapalapa | Cheirodendron platyphyllum (Hook. & Arn.) Seem. ssp. kauaiense (Krajina) Lowry | CHPLK | Araliaceae | |
| lapalapa | Cheirodendron platyphyllum (Hook. & Arn.) Seem. ssp. platyphyllum | CHPLP | Araliaceae | |
| Lapland amphidium moss | Amphidium lapponicum (Hedw.) Schimp. | AMLA70 | Orthotrichaceae | |
| Lapland cornel | Cornus suecica L. | COSU4 | Cornaceae | |
| lapland reedgrass | Calamagrostis lapponica (Wahlenb.) Hartman | CALA6 | Poaceae | |
| Lapland sedge | Carex lapponica O.F. Lang | CALA15 | Cyperaceae | |
| Laramie columbine | Aquilegia laramiensis A. Nels. | AQLA | Ranunculaceae | |
| larch dwarf mistletoe | Arceuthobium laricis (Piper) St. John | ARLA11 | Viscaceae | |
| Laredo sandmat | Chamaesyce laredana (Millsp.) Small | CHLA8 | Euphorbiaceae | |
| large boykinia | Boykinia major Gray | BOMA3 | Saxifragaceae | |
| large bullwort | Ammi majus L. | AMMA | Apiaceae | |
| large camas | Camassia leichtlinii (Baker) S. Wats. | CALE5 | Liliaceae | |
| large camas | Camassia leichtlinii (Baker) S. Wats. ssp. leichtlinii | CALEL6 | Liliaceae | |
| large fever berry | Croton megalobotrys Müll.Arg. | CRME15 | Euphorbiaceae | |
| large toothwort | Cardamine maxima (Nutt.) Wood | CAMA36 | Brassicaceae | |
| largebract spiderling | Boerhavia wrightii Gray | BOWR | Nyctaginaceae | |
| largeflower brunfelsia | Brunfelsia grandiflora D. Don | BRGR9 | Solanaceae | |
| largeflower cyrtandra | Cyrtandra grandiflora Gaud. | CYGR5 | Gesneriaceae | |
| largeflower false rosemary | Conradina grandiflora Small | COGR8 | Lamiaceae | |
| largeflower hawksbeard | Crepis occidentalis Nutt. | CROC | Asteraceae | |
| largeflower hawksbeard | Crepis occidentalis Nutt. ssp. conjuncta (Jepson) Babcock & Stebbins | CROCC | Asteraceae | |
| largeflower hawksbeard | Crepis occidentalis Nutt. ssp. costata (Gray) Babcock & Stebbins | CROCC2 | Asteraceae | |
| largeflower hawksbeard | Crepis occidentalis Nutt. ssp. occidentalis | CROCO2 | Asteraceae | |
| largeflower hawksbeard | Crepis occidentalis Nutt. ssp. pumila (Rydb.) Babcock & Stebbins | CROCP | Asteraceae | |
| largeflower milkweed | Asclepias connivens Baldw. | ASCO19 | Asclepiadaceae | |
| largeflower onion | Allium macropetalum Rydb. | ALMA4 | Liliaceae | |
| largeflower suncup | Camissonia megalantha (Munz) Raven | CAME16 | Onagraceae | |
| largeflower tickseed | Coreopsis grandiflora Hogg ex Sweet | COGR5 | Asteraceae | |
| largeflower tickseed | Coreopsis grandiflora Hogg ex Sweet var. grandiflora | COGRG | Asteraceae | |
| largeflower tickseed | Coreopsis grandiflora Hogg ex Sweet var. harveyana (Gray) Sherff | COGRH | Asteraceae | |
| largeflower tickseed | Coreopsis grandiflora Hogg ex Sweet var. longipes (Hook.) Torr. & Gray | COGRL | Asteraceae | |
| largeflower tickseed | Coreopsis grandiflora Hogg ex Sweet var. saxicola (Alexander) E.B. Sm. | COGRS | Asteraceae | |
| largeflower yellow false foxglove | Aureolaria grandiflora (Benth.) Pennell | AUGR | Scrophulariaceae | |
| largeflower yellow false foxglove | Aureolaria grandiflora (Benth.) Pennell var. cinerea Pennell | AUGRC | Scrophulariaceae | |
| largeflower yellow false foxglove | Aureolaria grandiflora (Benth.) Pennell var. grandiflora | AUGRG | Scrophulariaceae | |
| largeflower yellow false foxglove | Aureolaria grandiflora (Benth.) Pennell var. pulchra Pennell | AUGRP | Scrophulariaceae | |
| largeflower yellow false foxglove | Aureolaria grandiflora (Benth.) Pennell var. serrata (Torr. ex Benth.) Pennell | AUGRS | Scrophulariaceae | |
| largeflowered fiddleneck | Amsinckia grandiflora (Kleeb. ex Gray) Kleeb. ex Greene | AMGR3 | Boraginaceae | |
| largefruit amaranth | Amaranthus deflexus L. | AMDE | Amaranthaceae | |
| largefruit beggarticks | Bidens macrocarpa (Gray) Sherff | BIMA | Asteraceae | |
| largefruit sand verbena | Abronia macrocarpa L.A. Gal. | ABMA5 | Nyctaginaceae | |
| largehead sedge | Carex macrocephala Willd. ex Spreng. | CAMA10 | Cyperaceae | |
| largehead sedge | Carex macrocephala Willd. ex Spreng. var. bracteata Holm | CAMAB2 | Cyperaceae | |
| largehead sedge | Carex macrocephala Willd. ex Spreng. var. macrocephala | CAMAM6 | Cyperaceae | |
| largeleaf brunnera | Brunnera macrophylla (J.F. Adams) I.M. Johnston | BRMA11 | Boraginaceae | |
| largeleaf cup lichen | Cladonia macrophylla (Schaerer) Stenh. | CLMA13 | Cladoniaceae | |
| largeleaf geigertree | Cordia sebestena L. | COSE2 | Boraginaceae | |
| largeleaf maidenhair | Adiantum macrophyllum Sw. | ADMA | Pteridaceae | |
| largeleaf springparsley | Cymopterus megacephalus M.E. Jones | CYME | Apiaceae | |
| largeleaf wild indigo | Baptisia alba (L.) Vent. var. macrophylla (Larisey) Isely | BAALM | Fabaceae | |
| largeseed bittercress | Cardamine macrocarpa Brandeg. | CAMA7 | Brassicaceae | |
| largeseed goosefoot | Chenopodium macrospermum Hook. f. | CHMA7 | Chenopodiaceae | |
| largeseed goosefoot | Chenopodium macrospermum Hook. f. var. farinosum (S. Wats.) J.T. Howell | CHMAF | Chenopodiaceae | |
| largespike sedge | Carex macrostachys Bertol. | CAMA51 | Cyperaceae | |
| larkdaisy | Centratherum punctatum Cass. | CEPU6 | Asteraceae | |
| larkspurleaf monkshood | Aconitum delphiniifolium DC. | ACDE2 | Ranunculaceae | |
| larkspurleaf monkshood | Aconitum delphiniifolium DC. ssp. chamissonianum (Reichenb.) Hultén | ACDEC | Ranunculaceae | |
| larkspurleaf monkshood | Aconitum delphiniifolium DC. ssp. delphiniifolium | ACDED3 | Ranunculaceae | |
| larkspurleaf monkshood | Aconitum delphiniifolium DC. ssp. paradoxum (Reichenb.) Hultén | ACDEP | Ranunculaceae | |
| larkspurleaf tickseed | Coreopsis delphiniifolia Lam. | CODE3 | Asteraceae | |
| Las Animas nakedwood | Colubrina californica I.M. Johnston | COCA18 | Rhamnaceae | |
| Las Cuevas mountainbay | Calyptranthes estremenae Alain | CAES | Myrtaceae | |
| Las Vegas cryptantha | Cryptantha insolita (J.F. Macbr.) Payson | CRIN15 | Boraginaceae | |
| lateflowering goosefoot | Chenopodium album L. var. striatum (Krasan) comb. nov. ined. | CHALS2 | Chenopodiaceae | |
| lateral sedge | Carex unilateralis Mackenzie | CAUN3 | Cyperaceae | |
| Latin American flatsedge | Cyperus lentiginosus Millsp. & Chase | CYLE | Cyperaceae | |
| Latin American spleenwort | Asplenium flabellulatum Kunze | ASFL4 | Aspleniaceae | |
| laurel avispillo | Cinnamomum elongatum (Vahl ex Nees) Kosterm. | CIEL2 | Lauraceae | |
| laurel-leaf pigeonwings | Clitoria laurifolia Poir. | CLLA4 | Fabaceae | |
| laurel-leaf snailseed | Cocculus laurifolius (Roxb.) DC. | COLA20 | Menispermaceae | |
| Laurent's milkvetch | Astragalus collinus (Hook.) Dougl. ex G. Don var. laurentii (Rydb.) Barneby | ASCOL | Fabaceae | |
| Laurent's sedge | Carex vesicaria L. var. laurentiana Fern. | CAVEL | Cyperaceae | |
| lava clermontia | Clermontia calophylla F. Wimmer | CLCA5 | Campanulaceae | |
| lava cyrtandra | Cyrtandra confertiflora (Wawra) C.B. Clarke | CYCO7 | Gesneriaceae | |
| lava cyrtandra | Cyrtandra heinrichii St. John | CYHE6 | Gesneriaceae | |
| lavafield jackbean | Canavalia pubescens Hook. & Arn. | CAPU14 | Fabaceae | |
| lavaslope centaury | Centaurium sebaeoides (Griseb.) Druce | CESE6 | Gentianaceae | |
| lavenderleaf sundrops | Calylophus lavandulifolius (Torr. & Gray) Raven | CALA38 | Onagraceae | |
| Lavin's milkvetch | Astragalus oophorus S. Wats. var. lavinii Barneby | ASOOL3 | Fabaceae | |
| lawndaisy | Bellis perennis L. | BEPE2 | Asteraceae | |
| laxflower | Baileya pauciradiata Harvey & Gray ex Gray | BAPA | Asteraceae | |
| Laxmann's milkvetch | Astragalus laxmannii Jacq. | ASLA27 | Fabaceae | |
| Le Conte's flatsedge | Cyperus lecontei Torr. ex Steud. | CYLE2 | Cyperaceae | |
| Le Conte's thistle | Cirsium lecontei Torr. & Gray | CILE2 | Asteraceae | |
| leachlobe cyphomeris | Cyphomeris crassifolia (Standl.) Standl. | CYCR2 | Nyctaginaceae | |
| leadplant | Amorpha canescens Pursh | AMCA6 | Fabaceae | |
| Leadville milkvetch | Astragalus molybdenus Barneby | ASMO8 | Fabaceae | |
| leadwood | Combretum imberbe Wawra | COIM2 | Combretaceae | |
| leaf between flower | Bothriospermum tenellum (Hornem.) Fisch. & C.A. Mey. | BOTE4 | Boraginaceae | |
| leafcover saltweed | Atriplex phyllostegia (Torr. ex S. Wats.) S. Wats. | ATPH | Chenopodiaceae | |
| leafless bentspur orchid | Campylocentrum pachyrrhizum (Reichenb. f.) Rolfe | CAPA32 | Orchidaceae | |
| leafless swallow-wort | Cynanchum scoparium Nutt. | CYSC5 | Asclepiadaceae | |
| leafstem tickseed | Coreopsis calliopsidea (DC.) Gray | COCA9 | Asteraceae | |
| leafy brickellbush | Brickellia dentata (DC.) Schultz-Bip. | BRDE2 | Asteraceae | |
| leafy goosefoot | Chenopodium foliosum (Moench) Aschers. | CHFO2 | Chenopodiaceae | |
| leafy raillardiopsis | Anisocarpus scabridus (Eastw.) B.G. Baldwin | ANSC14 | Asteraceae | |
| leafy reedgrass | Calamagrostis foliosa Kearney | CAFO | Poaceae | |
| lean flatsedge | Cyperus setigerus Torr. & Hook. | CYSE3 | Cyperaceae | |
| leastdaisy | Chaetopappa DC. | CHAET2 | Asteraceae | |
| leather flower | Clematis L. | CLEMA | Ranunculaceae | |
| leatherfern | Acrostichum L. | ACROS | Pteridaceae | |
| leatherleaf | Chamaedaphne calyculata (L.) Moench | CHCA2 | Ericaceae | |
| leatherleaf | Chamaedaphne Moench | CHAMA5 | Ericaceae | |
| leatherleaf cyanea | Cyanea coriacea (Gray) Hbd. | CYCO13 | Campanulaceae | |
| leatherweed | Croton pottsii (Klotzsch) Muell.-Arg. | CRPO5 | Euphorbiaceae | |
| leatherweed | Croton pottsii (Klotzsch) Muell.-Arg. var. pottsii | CRPOP | Euphorbiaceae | |
| leatherweed | Croton pottsii (Klotzsch) Muell.-Arg. var. thermophilus (M.C. Johnston) M.C. Johnston | CRPOT | Euphorbiaceae | |
| leathery grapefern | Botrychium multifidum (Gmel.) Trev. | BOMU | Ophioglossaceae | |
| leathery grapefern | Botrychium robustum Rupr. | BORO6 | Ophioglossaceae | |
| Leavenworth's sedge | Carex leavenworthii Dewey | CALE6 | Cyperaceae | |
| Leavenworth's tickseed | Coreopsis leavenworthii Torr. & Gray | COLE3 | Asteraceae | |
| lecanora disc lichen | Buellia lecanoroides H. Magn. | BULE | Physciaceae | |
| lechecillo | Croton discolor Willd. | CRDI8 | Euphorbiaceae | |
| lechuguilla | Agave lechuguilla Torr. | AGLE | Agavaceae | |
| leechleaf cyanea | Cyanea undulata Forbes | CYUN5 | Campanulaceae | |
| Lehmann's rockjasmine | Androsace chamaejasme Wulfen ssp. lehmanniana (Spreng.) Hultén | ANCHL | Primulaceae | |
| Leiberg's bittercress | Cardamine breweri S. Wats. var. leibergii (Holz.) C.L. Hitchc. | CABRL | Brassicaceae | |
| Leiberg's brachythecium moss | Brachythecium leibergii Grout | BRLE9 | Brachytheciaceae | |
| Leiberg's milkvetch | Astragalus leibergii M.E. Jones | ASLE5 | Fabaceae | |
| Leichardt-bean | Cassia brewsteri (F. Muell.) F. Muell. ex Benth. | CABR41 | Fabaceae | |
| Lemhi milkvetch | Astragalus aquilonius (Barneby) Barneby | ASAQ2 | Fabaceae | |
| Lemington hawthorn | Crataegus lemingtonensis Sarg. | CRLE8 | Rosaceae | |
| Lemmon's beggarticks | Bidens lemmonii Gray | BILE2 | Asteraceae | |
| Lemmon's brickellbush | Brickellia lemmonii Gray | BRLE | Asteraceae | |
| Lemmon's brickellbush | Brickellia lemmonii Gray var. lemmonii | BRLEL | Asteraceae | |
| Lemmon's brickellbush | Brickellia lemmonii Gray var. wootonii (Greene) B.L. Robins. | BRLEW | Asteraceae | |
| Lemmon's ceanothus | Ceanothus lemmonii Parry | CELE | Rhamnaceae | |
| Lemmon's cologania | Cologania obovata Schlecht. | COOB14 | Fabaceae | |
| Lemmon's Indian paintbrush | Castilleja lemmonii Gray | CALE18 | Scrophulariaceae | |
| Lemmon's milkvetch | Astragalus lemmonii Gray | ASLE6 | Fabaceae | |
| Lemmon's milkweed | Asclepias lemmonii Gray | ASLE13 | Asclepiadaceae | |
| Lemmon's needlegrass | Achnatherum lemmonii (Vasey) Barkworth | ACLE8 | Poaceae | |
| Lemmon's needlegrass | Achnatherum lemmonii (Vasey) Barkworth var. lemmonii | ACLEL | Poaceae | |
| Lemmon's onion | Allium lemmonii S. Wats. | ALLE3 | Liliaceae | |
| Lemmon's rockcress | Arabis lemmonii S. Wats. | ARLE | Brassicaceae | |
| Lemmon's rockcress | Arabis lemmonii S. Wats. var. lemmonii | ARLEL | Brassicaceae | |
| Lemmon's sedge | Carex lemmonii W. Boott | CALE7 | Cyperaceae | |
| Lemmon's snakeroot | Ageratina lemmonii (B.L. Robins.) King & H.E. Robins. | AGLE3 | Asteraceae | |
| Lemmon's wildginger | Asarum lemmonii S. Wats. | ASLE | Aristolochiaceae | |
| lemon | Citrus ×limon (L.) Burm. f. (pro sp.) [medica × aurantifolia] | CILI5 | Rutaceae | |
| lemon beebrush | Aloysia triphylla (L'Hér.) Britt. | ALTR6 | Verbenaceae | |
| lemon bottlebrush | Callistemon pallidus (Bonpl.) DC. | CAPA72 | Myrtaceae | |
| lemon grass | Cymbopogon citratus (DC. ex Nees) Stapf | CYCI | Poaceae | |
| lemon grass | Cymbopogon Spreng. | CYMBO | Poaceae | |
| lemon lichen | Candelaria A. Massal. | CANDE2 | Candelariaceae | |
| lemon lichen | Candelaria fibrosa (Fr.) Mull. Arg. | CAFI11 | Candelariaceae | |
| lemonscented gum | Corymbia citriodora (Hook.) K.D. Hill & L.A. Johnson | COCI4 | Myrtaceae | |
| lengua de vaca | Anthurium dominicense Schott | ANDO | Araceae | |
| lens pod milkvetch | Astragalus lentiformis Gray ex Brewer & S. Wats. | ASLE7 | Fabaceae | |
| lenspod whitetop | Cardaria chalepensis (L.) Hand.-Maz. | CACH42 | Brassicaceae | |
| leoncita false foxglove | Agalinis calycina Pennell | AGCA7 | Scrophulariaceae | |
| Lescur's bartramiopsis moss | Bartramiopsis lescurii (James) Kindb. | BALE6 | Polytrichaceae | |
| Lesley's rimmed lichen | Aspicilia lesleyana Darbish. | ASLE24 | Hymeneliaceae | |
| lesser blackscale sedge | Carex atrosquama Mackenzie | CAAT8 | Cyperaceae | |
| lesser bottlebrush | Callistemon phoeniceus Lindley | CAPH10 | Myrtaceae | |
| lesser brown sedge | Carex adusta Boott | CAAD2 | Cyperaceae | |
| lesser burdock | Arctium minus Bernh. | ARMI2 | Asteraceae | |
| lesser calamint | Calamintha nepeta (L.) Savi | CANE17 | Lamiaceae | |
| lesser calamint | Calamintha nepeta (L.) Savi ssp. ?nepeta | CANEN | Lamiaceae | |
| lesser calamint | Calamintha nepeta (L.) Savi ssp. glandulosa (Riquien) P.W. Ball | CANEG | Lamiaceae | |
| lesser galangal | Alpinia officinarum Hance | ALOF4 | Zingiberaceae | |
| lesser Indian paintbrush | Castilleja minor (Gray) Gray | CAMI13 | Scrophulariaceae | |
| lesser Indian paintbrush | Castilleja minor (Gray) Gray ssp. minor | CAMIM6 | Scrophulariaceae | |
| lesser Indian paintbrush | Castilleja minor (Gray) Gray ssp. spiralis (Jepson) Chuang & Heckard | CAMIS3 | Scrophulariaceae | |
| lesser knapweed | Centaurea nigra L. | CENI2 | Asteraceae | |
| lesser panicled sedge | Carex diandra Schrank | CADI4 | Cyperaceae | |
| lesser pond sedge | Carex acutiformis Ehrh. | CAAC2 | Cyperaceae | |
| lesser rushy milkvetch | Astragalus convallarius Greene | ASCO12 | Fabaceae | |
| lesser rushy milkvetch | Astragalus convallarius Greene var. convallarius | ASCOC9 | Fabaceae | |
| lesser rushy milkvetch | Astragalus convallarius Greene var. finitimus Barneby | ASCOF | Fabaceae | |
| lesser rushy milkvetch | Astragalus convallarius Greene var. margaretiae Barneby | ASCOM4 | Fabaceae | |
| lesser rushy milkvetch | Astragalus convallarius Greene var. scopulorum Barneby | ASCOS | Fabaceae | |
| lesser saltmarsh sedge | Carex glareosa Schkuhr ex Wahlenb. | CAGL4 | Cyperaceae | |
| lesser saltmarsh sedge | Carex glareosa Schkuhr ex Wahlenb. ssp. glareosa | CAGLG | Cyperaceae | |
| lesser saltmarsh sedge | Carex glareosa Schkuhr ex Wahlenb. ssp. glareosa var. amphigena Fern. | CAGLA | Cyperaceae | |
| lesser saltmarsh sedge | Carex glareosa Schkuhr ex Wahlenb. ssp. glareosa var. glareosa | CAGLG3 | Cyperaceae | |
| lesser saltmarsh sedge | Carex glareosa Schkuhr ex Wahlenb. ssp. pribylovensis (Macoun) Halliday & Chater | CAGLP | Cyperaceae | |
| lesser saltscale | Atriplex minuscula Standl. | ATMI3 | Chenopodiaceae | |
| lesser snakeroot | Ageratina aromatica (L.) Spach | AGAR4 | Asteraceae | |
| lesser snakeroot | Ageratina aromatica (L.) Spach var. aromatica | AGARA | Asteraceae | |
| lesser snakeroot | Ageratina aromatica (L.) Spach var. incisa (Gray) C.F. Reed | AGARI2 | Asteraceae | |
| lesser swinecress | Coronopus didymus (L.) Sm. | CODI6 | Brassicaceae | |
| lesser waterplantain | Baldellia ranunculoides (L.) Parl. | BARA | Alismataceae | |
| lesser yellow lady's slipper | Cypripedium parviflorum Salisb. | CYPA19 | Orchidaceae | |
| lesser yellow lady's slipper | Cypripedium parviflorum Salisb. var. parviflorum | CYPAP4 | Orchidaceae | |
| Letterman's needlegrass | Achnatherum lettermanii (Vasey) Barkworth | ACLE9 | Poaceae | |
| Lewis' clarkia | Clarkia lewisii Raven & Parnell | CLLE2 | Onagraceae | |
| Lewis' evening-primrose | Camissonia lewisii Raven | CALE26 | Onagraceae | |
| Lewis River suncup | Camissonia parvula (Nutt. ex Torr. & Gray) Raven | CAPA39 | Onagraceae | |
| liana de cuello | Amphilophium paniculatum (L.) Kunth | AMPA6 | Bignoniaceae | |
| Liberian coffee | Coffea liberica Bull ex Hiern. | COLI8 | Rubiaceae | |
| licorice milkvetch | Astragalus glycyphyllos L. | ASGL4 | Fabaceae | |
| Liddon sedge | Carex petasata Dewey | CAPE7 | Cyperaceae | |
| light poppymallow | Callirhoe alcaeoides (Michx.) Gray | CAAL | Malvaceae | |
| lignumvitae | Bulnesia C. Gay | BULNE | Zygophyllaceae | |
| Ligurian yarrow | Achillea ligustica All. | ACLI2 | Asteraceae | |
| lija | Cordia lima (Desv.) Roemer & J.A. Schultes | COLI7 | Boraginaceae | |
| lilac snapdragon | Antirrhinum bellidifolium (L.) Willd. | ANBE5 | Scrophulariaceae | |
| lilacbush | Aubrieta Adans. | AUBRI2 | Brassicaceae | |
| lilacbush | Aubrieta deltoidea (L.) DC. | AUDE | Brassicaceae | |
| lilies-of-the-field | Anemone coronaria L. | ANCO40 | Ranunculaceae | |
| liliwai | Acaena exigua Gray | ACEX | Rosaceae | |
| lillydale onion | Allium oxyphilum Wherry | ALOX | Liliaceae | |
| lily of the Incas | Alstroemeria ?psittacina Lehm. | ALPS | Liliaceae | |
| lily of the Incas | Alstroemeria L. | ALSTR | Liliaceae | |
| lily of the Nile | Agapanthus africanus (L.) Hoffsgg. | AGAF | Liliaceae | |
| lilypad begonia | Begonia nelumbiifolia Cham. & Schlecht. | BENE3 | Begoniaceae | |
| lilythorn | Catesbaea L. | CATES | Rubiaceae | |
| Limahuli Valley cyanea | Cyanea kuhihewa Lammers | CYKU3 | Campanulaceae | |
| limber pine dwarf mistletoe | Arceuthobium cyanocarpum (A. Nels. ex Rydb.) A. Nels. | ARCY2 | Viscaceae | |
| lime fern | Cyclopeltis semicordata (Sw.) J. Sm. | CYSE4 | Dryopteridaceae | |
| lime orchid | Corymborkis forcipigera (Reichenb. f. & Warszewicz) L.O. Williams | COFO7 | Orchidaceae | |
| limestone bittercress | Cardamine douglassii Britt. | CADO | Brassicaceae | |
| limestone calamint | Clinopodium arkansanum (Nutt.) House | CLAR5 | Lamiaceae | |
| limestone flatsedge | Cyperus fuligineus Chapman | CYFU2 | Cyperaceae | |
| limestone glade milkvetch | Astragalus bibullatus Barneby & Bridges | ASBI6 | Fabaceae | |
| limestone hawksbeard | Crepis intermedia Gray | CRIN4 | Asteraceae | |
| limestone meadow sedge | Carex granularis Muhl. ex Willd. | CAGR3 | Cyperaceae | |
| limestone milkvetch | Astragalus titanophilus Barneby | ASTI2 | Fabaceae | |
| limestone sandmat | Chamaesyce blodgettii (Engelm. ex A.S. Hitchc.) Small | CHBL2 | Euphorbiaceae | |
| limestone spleenwort | Asplenium verecundum Chapman ex Underwood | ASVE6 | Aspleniaceae | |
| limestone thoroughwort | Chromolaena borinquensis (Britt.) King & H.E. Robins. | CHBO3 | Asteraceae | |
| limoncillo | Calyptranthes krugii Kiaersk. | CAKR | Myrtaceae | |
| limoncillo de monte | Calyptranthes sintenisii Kiaersk. | CASI8 | Myrtaceae | |
| Lindheimer's croton | Croton glandulosus L. var. lindheimeri Muell.-Arg. | CRGLL | Euphorbiaceae | |
| Lindheimer's hackberry | Celtis lindheimeri Engelm. ex K. Koch | CELI | Ulmaceae | |
| Lindheimer's hogwort | Croton capitatus Michx. var. lindheimeri (Engelm. & Gray) Muell.-Arg. | CRCAL2 | Euphorbiaceae | |
| Lindheimer's Indian paintbrush | Castilleja purpurea (Nutt.) G. Don var. lindheimeri (Gray) Shinners | CAPUL | Scrophulariaceae | |
| Lindheimer's milkvetch | Astragalus lindheimeri Engelm. ex Gray | ASLI4 | Fabaceae | |
| Lindley's butterflybush | Buddleja lindleyana Fortune | BULI | Buddlejaceae | |
| Lindley's clarkia | Clarkia amoena (Lehm.) A. Nels. & J.F. Macbr. ssp. lindleyi (Dougl.) H.F. & M.E. Lewis | CLAML | Onagraceae | |
| Lindley's clerodendrum | Clerodendrum lindleyi Dcne. | CLLI6 | Verbenaceae | |
| Lindley's clerodendrum | Clerodendrum lindleyi Dcne. var. paniculatum Moldenke | CLLIP | Verbenaceae | |
| Lindley's saltbush | Atriplex lindleyi Moq. | ATLI | Chenopodiaceae | |
| Lindsey's cyanea | Cyanea ?lindseyana Rock | CYLI6 | Campanulaceae | |
| linearleaf cyanea | Cyanea linearifolia Rock | CYLI7 | Campanulaceae | |
| lined sedge | Carex striatula Michx. | CAST17 | Cyperaceae | |
| lineleaf fern | Antrophyum Kaulfuss | ANTRO | Vittariaceae | |
| lineseed | Bellardia All. | BELLA | Scrophulariaceae | |
| linguam | Capparis indica (L.) Druce | CAIN5 | Capparaceae | |
| Link's coenogonium lichen | Coenogonium linkii Ehrenb. | COLI13 | Gyalectaceae | |
| lion's tail | Chaiturus marrubiastrum (L.) Reichenb. | CHMA18 | Lamiaceae | |
| lion's tail | Chaiturus Willd. | CHAIT | Lamiaceae | |
| lipfern | Cheilanthes Sw. | CHEIL | Pteridaceae | |
| lipsticktree | Bixa orellana L. | BIOR | Bixaceae | |
| little amphianthus | Amphianthus pusillus Torr. | AMPU7 | Scrophulariaceae | |
| Little Belt Mountain thimbleweed | Anemone lithophila Rydb. | ANLI4 | Ranunculaceae | |
| little bun milkvetch | Astragalus simplicifolius (Nutt.) Gray | ASSI4 | Fabaceae | |
| little cryptantha | Cryptantha minima Rydb. | CRMI5 | Boraginaceae | |
| little goblin moonwort | Botrychium mormo W.H. Wagner | BOMO2 | Ophioglossaceae | |
| little grapefern | Botrychium simplex E. Hitchc. | BOSI | Ophioglossaceae | |
| little green sedge | Carex viridula Michx. | CAVI5 | Cyperaceae | |
| little green sedge | Carex viridula Michx. ssp. brachyrrhyncha (Celak.) B. Schmid | CAVIB | Cyperaceae | |
| little green sedge | Carex viridula Michx. ssp. brachyrrhyncha (Celak.) B. Schmid var. elatior (Schlecht.) Crins | CAVIE | Cyperaceae | |
| little green sedge | Carex viridula Michx. ssp. oedocarpa (Anderss.) B. Schmid | CAVIO | Cyperaceae | |
| little green sedge | Carex viridula Michx. ssp. viridula | CAVIV | Cyperaceae | |
| little ironweed | Cyanthillium cinereum (L.) H.E. Robins. | CYCI4 | Asteraceae | |
| Little Kern milkvetch | Astragalus shevockii Barneby | ASSH5 | Fabaceae | |
| little lemonhead | Coreocarpus arizonicus (Gray) Blake | COAR5 | Asteraceae | |
| Little Mountain thimbleweed | Anemone lyallii Britt. | ANLY | Ranunculaceae | |
| little Parish's needlegrass | Achnatherum parishii (Vasey) Barkworth var. depauperatum (M.E. Jones) Barkworth | ACPAD | Poaceae | |
| little prince's pine | Chimaphila menziesii (R. Br. ex D. Don) Spreng. | CHME | Pyrolaceae | |
| little quakinggrass | Briza minor L. | BRMI2 | Poaceae | |
| little reddish Indian paintbrush | Castilleja rubida Piper | CARU8 | Scrophulariaceae | |
| Little River Canyon onion | Allium speculae Ownbey & Aase | ALSP2 | Liliaceae | |
| little rose | Chamaerhodos Bunge | CHAMA7 | Rosaceae | |
| little rose | Chamaerhodos erecta (L.) Bunge | CHER | Rosaceae | |
| little sagebrush | Artemisia arbuscula Nutt. | ARAR8 | Asteraceae | |
| little sagebrush | Artemisia arbuscula Nutt. ssp. arbuscula | ARARA | Asteraceae | |
| little sagebrush | Artemisia arbuscula Nutt. ssp. longicaulis Winward & McArthur | ARARL3 | Asteraceae | |
| little sagebrush | Artemisia arbuscula Nutt. ssp. longiloba (Osterhout) L. Shultz | ARARL | Asteraceae | |
| little sagebrush | Artemisia arbuscula Nutt. ssp. thermopola Beetle | ARART | Asteraceae | |
| little sand verbena | Abronia minor Standl. | ABMI2 | Nyctaginaceae | |
| little spleenwort | Asplenium exiguum Bedd. | ASEX2 | Aspleniaceae | |
| Little Sur manzanita | Arctostaphylos edmundsii J.T. Howell | ARED | Ericaceae | |
| little western bittercress | Cardamine oligosperma Nutt. | CAOL | Brassicaceae | |
| little western bittercress | Cardamine oligosperma Nutt. var. oligosperma | CAOLO | Brassicaceae | |
| little wiry suncup | Camissonia pusilla Raven | CAPU16 | Onagraceae | |
| littleawn needlegrass | Achnatherum lobatum (Swallen) Barkworth | ACLO7 | Poaceae | |
| littleflower roseling | Callisia micrantha (Torr.) D.R. Hunt | CAMI25 | Commelinaceae | |
| littlehip hawthorn | Crataegus spathulata Michx. | CRSP | Rosaceae | |
| littleleaf boxwood | Buxus microphylla Siebold & Zucc. | BUMI5 | Buxaceae | |
| littleleaf brickellbush | Brickellia microphylla (Nutt.) Gray | BRMI | Asteraceae | |
| littleleaf brickellbush | Brickellia microphylla (Nutt.) Gray var. microphylla | BRMIM | Asteraceae | |
| littleleaf buckbrush | Ceanothus microphyllus Michx. | CEMI4 | Rhamnaceae | |
| littleleaf ceanothus | Ceanothus parvifolius (S. Wats.) Trel. | CEPA4 | Rhamnaceae | |
| littleleaf greentwig | Brongniartia minutifolia S. Wats. | BRMI4 | Fabaceae | |
| littleleaf mountain mahogany | Cercocarpus intricatus S. Wats. | CEIN7 | Rosaceae | |
| littleleaf peashrub | Caragana microphylla Lam. | CAMI48 | Fabaceae | |
| littleleaf pussytoes | Antennaria microphylla Rydb. | ANMI3 | Asteraceae | |
| littleleaf rockcress | Arabis microphylla Nutt. | ARMI | Brassicaceae | |
| littleleaf rockcress | Arabis microphylla Nutt. var. microphylla | ARMIM2 | Brassicaceae | |
| littleleaf sedge | Carex luzulifolia W. Boott | CALU6 | Cyperaceae | |
| littleleaf titi | Cyrilla parvifolia Raf. | CYPA6 | Cyrillaceae | |
| littleleaf wrightwort | Carlowrightia parvifolia Brandeg. | CAPA51 | Acanthaceae | |
| littlepod false flax | Camelina microcarpa Andrz. ex DC. | CAMI2 | Brassicaceae | |
| littlesnout sedge | Carex microrhyncha Mackenzie | CAMI8 | Cyperaceae | |
| littletooth sedge | Carex microdonta Torr. & Hook. | CAMI5 | Cyperaceae | |
| Livermore sandwort | Arenaria livermorensis Correll | ARLI3 | Caryophyllaceae | |
| livid sedge | Carex livida (Wahlenb.) Willd. | CALI | Cyperaceae | |
| livid sedge | Carex livida (Wahlenb.) Willd. var. radicaulis Paine | CALIR | Cyperaceae | |
| livingrock | Ariocarpus Scheidw. | ARIOC | Cactaceae | |
| livingvase | Aechmea Ruiz & Pavón | AECHM | Bromeliaceae | |
| llerenes | Calathea allouia (Aubl.) Lindl. | CAAL13 | Marantaceae | |
| lluvia de orquideas | Congea tomentosa Roxb. | COTO2 | Verbenaceae | |
| Loa milkvetch | Astragalus welshii Barneby | ASWE4 | Fabaceae | |
| lobed croton | Croton lobatus L. | CRLO5 | Euphorbiaceae | |
| lobed spleenwort | Asplenium pinnatifidum Nutt. | ASPI | Aspleniaceae | |
| lobed tickseed | Coreopsis auriculata L. | COAU | Asteraceae | |
| locoto | Capsicum baccatum L. | CABA29 | Solanaceae | |
| locoto | Capsicum baccatum L. var. baccatum | CABAB | Solanaceae | |
| locustberry | Byrsonima coccolobifolia Kunth | BYCO3 | Malpighiaceae | |
| Lone Pine milkvetch | Astragalus sepultipes (Barneby) Barneby | ASSE3 | Fabaceae | |
| lonestar hawthorn | Crataegus uvaldensis Sarg. | CRUV | Rosaceae | |
| Long Key locustberry | Byrsonima lucida (P. Mill.) DC. | BYLU | Malpighiaceae | |
| long knight's-spur | Consolida tenuissima (Sibthorp & Sm.) Soó | COTE19 | Ranunculaceae | |
| long strapfern | Campyloneurum phyllitidis (L.) K. Presl | CAPH5 | Polypodiaceae | |
| Long Valley milkvetch | Astragalus johannis-howellii Barneby | ASJO | Fabaceae | |
| longawn sedge | Carex macrochaeta C.A. Mey. | CAMA11 | Cyperaceae | |
| longbeak rattlebox | Crotalaria longirostrata Hook. & Arn. | CRLO3 | Fabaceae | |
| longbeard mariposa lily | Calochortus longebarbatus S. Wats. | CALO3 | Liliaceae | |
| longbeard mariposa lily | Calochortus longebarbatus S. Wats. var. longebarbatus | CALOL | Liliaceae | |
| longbeard mariposa lily | Calochortus longebarbatus S. Wats. var. peckii Ownbey | CALOP4 | Liliaceae | |
| longbract sedge | Carex extensa Goodenough | CAEX8 | Cyperaceae | |
| longbract wild indigo | Baptisia bracteata Muhl. ex Ell. | BABR2 | Fabaceae | |
| longbract wild indigo | Baptisia bracteata Muhl. ex Ell. var. bracteata | BABRB | Fabaceae | |
| longbract wild indigo | Baptisia bracteata Muhl. ex Ell. var. laevicaulis (Gray ex Canby) Isely | BABRL | Fabaceae | |
| longbract wild indigo | Baptisia bracteata Muhl. ex Ell. var. leucophaea (Nutt.) Kartesz & Gandhi | BABRL2 | Fabaceae | |
| longcapsule suncup | Camissonia chamaenerioides (Gray) Raven | CACH12 | Onagraceae | |
| longflower bamboo | Bambusa longifolia (Fourn.) McClure | BALO3 | Poaceae | |
| longflower cryptantha | Cryptantha longiflora (A. Nels.) Payson | CRLO6 | Boraginaceae | |
| longflower rabbitbrush | Chrysothamnus depressus Nutt. | CHDE2 | Asteraceae | |
| long-foot cyanea | Cyanea dolichopoda Lammers & Lorence | CYDO3 | Campanulaceae | |
| longhair sedge | Carex comosa Boott | CACO8 | Cyperaceae | |
| long-hair silverscale | Atriplex longitrichoma Stutz, Chu, & Sanderson | ATLO3 | Chenopodiaceae | |
| longhood milkweed | Asclepias macrotis Torr. | ASMA | Asclepiadaceae | |
| longleaf arnica | Arnica lonchophylla Greene | ARLO5 | Asteraceae | |
| longleaf arnica | Arnica lonchophylla Greene ssp. lonchophylla | ARLOL | Asteraceae | |
| longleaf brickellbush | Brickellia longifolia S. Wats. | BRLO | Asteraceae | |
| longleaf brickellbush | Brickellia longifolia S. Wats. var. longifolia | BRLOL3 | Asteraceae | |
| longleaf brickellbush | Brickellia longifolia S. Wats. var. multiflora (Kellogg) Cronq. | BRLOM | Asteraceae | |
| longleaf buchu | Agathosma serratifolia (Curtis) Spreeth | AGSE5 | Rutaceae | |
| longleaf cologania | Cologania angustifolia Kunth | COAN | Fabaceae | |
| longleaf Indian paintbrush | Castilleja subinclusa Greene | CASU10 | Scrophulariaceae | |
| longleaf Indian paintbrush | Castilleja subinclusa Greene ssp. franciscana (Pennell) Chuang & Heckard | CASUF2 | Scrophulariaceae | |
| longleaf Indian paintbrush | Castilleja subinclusa Greene ssp. subinclusa | CASUS7 | Scrophulariaceae | |
| longleaf milkweed | Asclepias longifolia Michx. | ASLO | Asclepiadaceae | |
| longleaf threeawn | Aristida palustris (Chapman) Vasey | ARPA26 | Poaceae | |
| longleaf woodoats | Chasmanthium sessiliflorum (Poir.) Yates | CHSE2 | Poaceae | |
| longleaf wormwood | Artemisia longifolia Nutt. | ARLO7 | Asteraceae | |
| long-pod-cassia | Cassia abbreviata Oliver | CAAB13 | Fabaceae | |
| Long's bittercress | Cardamine longii Fern. | CALO11 | Brassicaceae | |
| Long's sedge | Carex longii Mackenzie | CALO5 | Cyperaceae | |
| longspike beardgrass | Bothriochloa longipaniculata (Gould) Allred & Gould | BOLO | Poaceae | |
| longspike Indian paintbrush | Castilleja pilosa (S. Wats.) Rydb. var. longispica (A. Nels.) N. Holmgren | CAPIL | Scrophulariaceae | |
| longspur columbine | Aquilegia longissima Gray | AQLO | Ranunculaceae | |
| longstalk sedge | Carex pedunculata Muhl. ex Willd. | CAPE4 | Cyperaceae | |
| longstalk springparsley | Cymopterus longipes S. Wats. | CYLO | Apiaceae | |
| longstem sandwort | Arenaria longipedunculata Hultén | ARLO | Caryophyllaceae | |
| longstock water-starwort | Callitriche longipedunculata Morong | CALO2 | Callitrichaceae | |
| long-stolon sedge | Carex inops Bailey | CAIN9 | Cyperaceae | |
| long-stolon sedge | Carex inops Bailey ssp. inops | CAINI3 | Cyperaceae | |
| longstyle thistle | Cirsium longistylum Moore & Frankton | CILO2 | Asteraceae | |
| longtail wildginger | Asarum wagneri Lu & Mesler | ASWA6 | Aristolochiaceae | |
| long-tubercle beehive cactus | Coryphantha robustispina (Schott ex Engelm.) Britt. & Rose | CORO7 | Cactaceae | |
| long-tubercle beehive cactus | Coryphantha robustispina (Schott ex Engelm.) Britt. & Rose ssp. robustispina | COROR | Cactaceae | |
| loose silkybent | Apera spica-venti (L.) Beauv. | APSP | Poaceae | |
| looseflower alpine sedge | Carex rariflora (Wahlenb.) Sm. | CARA5 | Cyperaceae | |
| looseflower alpine sedge | Carex rariflora (Wahlenb.) Sm. var. rariflora | CARAR2 | Cyperaceae | |
| looseflower milkvetch | Astragalus tenellus Pursh | ASTE5 | Fabaceae | |
| loosehead sandwort | Arenaria congesta Nutt. var. lithophila (Rydb.) Maguire | ARCOL | Caryophyllaceae | |
| lopleaf | Cypholophus Weddell | CYPHO2 | Urticaceae | |
| lopsided oat | Avena strigosa Schreb. | AVST2 | Poaceae | |
| Lorent's goatgrass | Aegilops lorentii Hochst. | AELO2 | Poaceae | |
| Lori's columbine | Aquilegia loriae Welsh & Atwood | AQLO2 | Ranunculaceae | |
| los pinitos dodder | Cuscuta dentatasquamata Yuncker | CUDE3 | Cuscutaceae | |
| Lost Hills saltbush | Atriplex vallicola Hoover | ATVA | Chenopodiaceae | |
| Lott's gilia | Aliciella lottiae (Day) J.M. Porter | ALLO6 | Polemoniaceae | |
| lotus milkvetch | Astragalus lotiflorus Hook. | ASLO4 | Fabaceae | |
| Louise's swallow-wort | Cynanchum louiseae Kartesz & Gandhi | CYLO11 | Asclepiadaceae | |
| Louisiana bluestar | Amsonia ludoviciana Vail | AMLU2 | Apocynaceae | |
| Louisiana flatsedge | Cyperus sanguinolentus Vahl | CYSA10 | Cyperaceae | |
| Louisiana sedge | Carex louisianica Bailey | CALO6 | Cyperaceae | |
| loulu | Coniogramme pilosa (Brack.) Hieron. | COPI3 | Pteridaceae | |
| love in a puff | Cardiospermum halicacabum L. | CAHA13 | Sapindaceae | |
| love-lies-bleeding | Amaranthus caudatus L. | AMCA3 | Amaranthaceae | |
| loving sedge | Carex pityophila Mackenzie | CAPI7 | Cyperaceae | |
| low cryptantha | Cryptantha pusilla (Torr. & Gray) Greene | CRPU7 | Boraginaceae | |
| low false bindweed | Calystegia spithamaea (L.) Pursh | CASP14 | Convolvulaceae | |
| low false bindweed | Calystegia spithamaea (L.) Pursh ssp. purshiana (Wherry) Brummitt | CASPP | Convolvulaceae | |
| low false bindweed | Calystegia spithamaea (L.) Pursh ssp. spithamaea | CASPS2 | Convolvulaceae | |
| low false bindweed | Calystegia spithamaea (L.) Pursh ssp. stans (Michx.) Brummitt | CASPS | Convolvulaceae | |
| low flatsedge | Cyperus pumilus L. | CYPU3 | Cyperaceae | |
| low goosefoot | Chenopodium chenopodioides (L.) Aellen | CHCH | Chenopodiaceae | |
| low northern sedge | Carex concinna R. Br. | CACO10 | Cyperaceae | |
| low pussytoes | Antennaria dimorpha (Nutt.) Torr. & Gray | ANDI2 | Asteraceae | |
| low rattlebox | Crotalaria pumila Ortega | CRPU4 | Fabaceae | |
| low serviceberry | Amelanchier humilis Wieg. | AMHU2 | Rosaceae | |
| low shoebutton | Ardisia humilis Vahl | ARHU8 | Myrsinaceae | |
| low silverbush | Argythamnia humilis (Engelm. & Gray) Muell.-Arg. | ARHU5 | Euphorbiaceae | |
| low silverbush | Argythamnia humilis (Engelm. & Gray) Muell.-Arg. var. humilis | ARHUH | Euphorbiaceae | |
| low silverbush | Argythamnia humilis (Engelm. & Gray) Muell.-Arg. var. laevis (Torr.) Shinners | ARHUL | Euphorbiaceae | |
| low silverbush | Argythamnia humilis (Engelm. & Gray) Muell.-Arg. var. leiosperma Waterfall | ARHUL2 | Euphorbiaceae | |
| low starburr | Acanthospermum humile (Sw.) DC. | ACHU | Asteraceae | |
| low woodland sedge | Carex socialis Mohlenbrock & Schwegm. | CASO | Cyperaceae | |
| Lozano's false Indianmallow | Allowissadula lozanii (Rose) Bates | ALLO2 | Malvaceae | |
| Lucy Braun's snakeroot | Ageratina luciae-brauniae (Fern.) King & H.E. Robins. | AGLU | Asteraceae | |
| Luquillo forest lidflower | Calyptranthes luquillensis Alain | CALU12 | Myrtaceae | |
| Luquillo Mountain manjack | Cordia wagneriorum Howard | COWA3 | Boraginaceae | |
| Luquillo Mountain snailwood | Conostegia rufescens Naud. | CORU17 | Melastomataceae | |
| Luzon jelly lichen | Collema furfuraceum (Arnold) Du Rietz var. luzonense (Rasanen) Degel. | COFUL | Collemataceae | |
| Lyall's angelica | Angelica arguta Nutt. | ANAR3 | Apiaceae | |
| Lyall's mariposa lily | Calochortus lyallii Baker | CALY | Liliaceae | |
| Lyall's milkvetch | Astragalus lyallii Gray | ASLY | Fabaceae | |
| Lyall's rockcress | Arabis lyallii S. Wats. | ARLY | Brassicaceae | |
| Lyall's rockcress | Arabis lyallii S. Wats. var. lyallii | ARLYL | Brassicaceae | |
| Lyall's rockcress | Arabis lyallii S. Wats. var. nubigena (J.F. Macbr. & Payson) Rollins | ARLYN | Brassicaceae | |
| Lyngbye's sedge | Carex lyngbyei Hornem. | CALY3 | Cyperaceae | |
| Lynn Haven goldenaster | Chrysopsis lanuginosa Small | CHLA21 | Asteraceae | |
| lyrate rockcress | Arabis lyrata L. | ARLY2 | Brassicaceae | |
| lyre shell lichen | Arthopyrenia lyrata R. C. Harris | ARLY4 | Arthopyreniaceae | |
| lyreleaf greeneyes | Berlandiera lyrata Benth. | BELY | Asteraceae | |
| macata bourse bastard | Acacia vogeliana Steud. | ACVO | Fabaceae | |
| MacBride cleomella | Cleomella macbrideana Payson | CLMA3 | Capparaceae | |
| MacCart's sundrops | Calylophus hartwegii (Benth.) Raven ssp. maccartii (Shinners) Towner & Raven | CAHAM | Onagraceae | |
| MacCart's swallow-wort | Cynanchum maccartii Shinners | CYMA3 | Asclepiadaceae | |
| MacDonald rockcress | Arabis macdonaldiana Eastw. | ARMA33 | Brassicaceae | |
| MacDougal's Indian parsley | Aletes macdougalii Coult. & Rose | ALMA3 | Apiaceae | |
| MacDougal's Indian parsley | Aletes macdougalii Coult. & Rose ssp. breviradiatus Theobald & Tseng | ALMAB | Apiaceae | |
| MacDougal's Indian parsley | Aletes macdougalii Coult. & Rose ssp. macdougalii | ALMAM | Apiaceae | |
| Mackenzie's sedge | Carex mackenziei Krecz. | CAMA8 | Cyperaceae | |
| Mackenzie's water hemlock | Cicuta virosa L. | CIVI5 | Apiaceae | |
| MacNab's cypress | Cupressus macnabiana A. Murr. | CUMA | Cupressaceae | |
| Macoun's anthoceros | Anthoceros macounii M.A. Howe | ANMA15 | Anthocerotaceae | |
| Macoun's arthothelium lichen | Arthothelium macounii (G. Merr.) W. Noble | ARMA24 | Uncertain Lichen Family | |
| Macoun's calliergon moss | Calliergon macounii Karcz. | CAMA50 | Amblystegiaceae | |
| Macoun's false bindweed | Calystegia macounii (Greene) Brummitt | CAMA23 | Convolvulaceae | |
| Macoun's reedgrass | Calamagrostis canadensis (Michx.) Beauv. var. macouniana (Vasey) Stebbins | CACAM | Poaceae | |
| Macoun's rockcress | Arabis microphylla Nutt. var. macounii (S. Wats.) Rollins | ARMIM | Brassicaceae | |
| MaCrae's spleenwort | Asplenium macraei Hook. & Grev. | ASMA7 | Aspleniaceae | |
| Madagascar flatsedge | Cyperus phaeolepis Cherm. | CYPH | Cyperaceae | |
| Madagascar periwinkle | Catharanthus roseus (L.) G. Don | CARO14 | Apocynaceae | |
| Madagascar rubbervine | Cryptostegia madagascariensis Bojer ex Dcne. | CRMA10 | Asclepiadaceae | |
| madam gorgon | Acicarpha tribuloides Juss. | ACTR2 | Calyceraceae | |
| madieravine | Anredera Juss. | ANRED | Basellaceae | |
| madrone | Arbutus L. | ARBUT | Ericaceae | |
| madwort | Alyssum L. | ALYSS | Brassicaceae | |
| Magennis' dogstooth grass | Cynodon magennisii Hurcombe (pro hybr.) | CYMA2 | Poaceae | |
| maguey | Agave atrovirens Karw. ex Salm-Dyck | AGAT | Agavaceae | |
| Maguire's milkvetch | Astragalus cobrensis Gray var. maguirei Kearney | ASCOM | Fabaceae | |
| mahogany | Afzelia Smith | AFZEL | Fabaceae | |
| mahogany milkweed | Asclepias hypoleuca (Gray) Woods. | ASHY5 | Asclepiadaceae | |
| maiden blue eyed Mary | Collinsia parviflora Lindl. | COPA3 | Scrophulariaceae | |
| maidenberry | Crossopetalum rhacoma Crantz | CRRH | Celastraceae | |
| maidencane | Amphicarpum Kunth | AMPHI2 | Poaceae | |
| maidenhair fern | Adiantum L. | ADIAN | Pteridaceae | |
| maidenhair spleenwort | Asplenium trichomanes L. | ASTR2 | Aspleniaceae | |
| maidenhair spleenwort | Asplenium trichomanes L. ssp. quadrivalens D.E. Mey. | ASTRQ | Aspleniaceae | |
| maidenhair spleenwort | Asplenium trichomanes L. ssp. trichomanes | ASTRT | Aspleniaceae | |
| maidenplum | Comocladia P. Br. | COMOC | Anacardiaceae | |
| maile | Alyxia oliviformis Gaud. | ALOL2 | Apocynaceae | |
| Makaha Valley jackbean | Canavalia napaliensis St. John | CANA4 | Fabaceae | |
| makole | Coprosma granadensis (L. f.) Heads | COGR23 | Rubiaceae | |
| mala mujer | Cnidoscolus angustidens Torr. | CNAN | Euphorbiaceae | |
| malanga | Cladium colocasia (L.) W. Wight | CLCO7 | Cyperaceae | |
| Malaysian scurfpea | Cullen corylifolia (L.) Medik. | CUCO7 | Fabaceae | |
| Malheur cryptantha | Cryptantha propria (A. Nels. & J.F. Macbr.) Payson | CRPR3 | Boraginaceae | |
| Malheur Valley fiddleneck | Amsinckia carinata A. Nels. & J.F. Macbr. | AMCA8 | Boraginaceae | |
| Malibu baccharis | Baccharis malibuensis Beauchamp & Henderson | BAMA13 | Asteraceae | |
| Mallory's manzanita | Arctostaphylos malloryi (W. Knight & Gankin) P.V. Wells | ARMA31 | Ericaceae | |
| mallow bindweed | Convolvulus althaeoides L. | COAL4 | Convolvulaceae | |
| Malme's chiodecton lichen | Chiodecton malmei Thor | CHMA16 | Opegraphaceae | |
| Maltese star-thistle | Centaurea melitensis L. | CEME2 | Asteraceae | |
| maluco | Acmella iodiscaea (A.H. Moore) R.K. Jansen | ACIO | Asteraceae | |
| mamoncillo | Aeluropus lagopoides (L.) Thwaites | AELA2 | Poaceae | |
| manac | Calyptronoma Griseb. | CALYP5 | Arecaceae | |
| manaca | Brunfelsia uniflora (Pohl) D. Don | BRUN4 | Solanaceae | |
| manateegrass | Cymodocea filiformis (Kuetz.) Correll | CYFI3 | Cymodoceaceae | |
| Mancos columbine | Aquilegia micrantha Eastw. | AQMI | Ranunculaceae | |
| Mancos columbine | Aquilegia micrantha Eastw. var. mancosana Eastw. | AQMIM | Ranunculaceae | |
| Mancos columbine | Aquilegia micrantha Eastw. var. micrantha | AQMIM2 | Ranunculaceae | |
| Mancos milkvetch | Astragalus humillimus Gray | ASHU | Fabaceae | |
| Mandan ricegrass | ×Achnella caduca (Beal) Barkworth [Achnatherum hymenoides × Nassella viridula] | ACCA32 | Poaceae | |
| Mandarin lime | Citrus ×limonia Osbeck (pro sp.) [limon × reticulata] | CILI3 | Rutaceae | |
| manduro | Balanites maughamii Sprague | BAMA10 | Zygophyllaceae | |
| manfern | Cibotium Kaulfuss | CIBOT | Dicksoniaceae | |
| mango brome | Bromus mango Desv. | BRMA8 | Poaceae | |
| mango ginger | Curcuma amada Roxb. | CUAM4 | Zingiberaceae | |
| mangrove | Avicennia L. | AVICE | Verbenaceae | |
| mangrove | Conocarpus L. | CONOC | Combretaceae | |
| Manhart's sedge | Carex manhartii Bryson | CAMA33 | Cyperaceae | |
| manna wattle | Acacia microcarpa F. Muell. | ACMI6 | Fabaceae | |
| Mann's cucumeropsis | Cucumeropsis mannii Naudin | CUMA5 | Cucurbitaceae | |
| Mann's cyanea | Cyanea mannii (Brigham) Hbd. | CYMA12 | Campanulaceae | |
| Mansfield hawthorn | Crataegus indicens Ashe | CRIN16 | Rosaceae | |
| manycolor rimmed lichen | Aspicilia polychroma (Anzi) Nyl. | ASPO10 | Hymeneliaceae | |
| manyflower flatsedge | Cyperus lancastriensis Porter ex Gray | CYLA3 | Cyperaceae | |
| manyflower grasspink | Calopogon multiflorus Lindl. | CAMU10 | Orchidaceae | |
| manyflower leastdaisy | Chaetopappa bellioides (Gray) Shinners | CHBE3 | Asteraceae | |
| manyflower onion | Allium pleianthum S. Wats. | ALPL3 | Liliaceae | |
| manyflower sedge | Carex pluriflora Hultén | CAPL6 | Cyperaceae | |
| manyfruit cyanea | Cyanea pycnocarpa (Hbd.) F. Wimmer | CYPY | Campanulaceae | |
| manyhead sedge | Carex sychnocephala Carey | CASY | Cyperaceae | |
| manyrib sedge | Carex multicostata Mackenzie | CAMU6 | Cyperaceae | |
| manyseed goosefoot | Chenopodium polyspermum L. | CHPO | Chenopodiaceae | |
| manyseed goosefoot | Chenopodium polyspermum L. var. acutifolium (Sm.) Gaud. | CHPOA | Chenopodiaceae | |
| manyseed goosefoot | Chenopodium polyspermum L. var. obtusifolium Gaud. | CHPOO | Chenopodiaceae | |
| manyspike flatsedge | Cyperus polystachyos Rottb. | CYPO | Cyperaceae | |
| manyspike flatsedge | Cyperus polystachyos Rottb. var. miser Kükenth. | CYPOM | Cyperaceae | |
| manyspike flatsedge | Cyperus polystachyos Rottb. var. polystachyos | CYPOP2 | Cyperaceae | |
| manystem centaury | Centaurium multicaule B.L. Robins. | CEMU5 | Gentianaceae | |
| manystem sedge | Carex multicaulis Bailey | CAMU5 | Cyperaceae | |
| manzanilla horseweed | Conyza laevigata (L.C. Rich) Pruski | COLA21 | Asteraceae | |
| manzanilla trepador | Bidens reptans (L.) G. Don | BIRE | Asteraceae | |
| manzanilla trepador | Bidens reptans (L.) G. Don var. reptans | BIRER | Asteraceae | |
| manzanita | Arctostaphylos Adans. | ARCTO3 | Ericaceae | |
| manzanita tejocotera | Crataegus mexicana DC. | CRME12 | Rosaceae | |
| mapele | Cyrtandra cyaneoides Rock | CYCY3 | Gesneriaceae | |
| maple | Acer L. | ACER | Aceraceae | |
| mapleleaf goosefoot | Chenopodium simplex (Torr.) Raf. | CHSI2 | Chenopodiaceae | |
| Mapulehu Valley cyanea | Cyanea profuga Forbes | CYPR9 | Campanulaceae | |
| maquei | Aristotelia chilensis (Molina) Stuntz | ARCH17 | Elaeocarpaceae | |
| maraca amarilla | Canna glauca L. | CAGL13 | Cannaceae | |
| maraca montuna | Canna pertusa Urban | CAPE13 | Cannaceae | |
| maraca roja | Canna sylvestris Roscoe | CASY5 | Cannaceae | |
| maracaibo lignumvitae | Bulnesia arborea (Jacq.) Engler | BUAR5 | Zygophyllaceae | |
| marang | Artocarpus odoratissimus Blanco | AROD2 | Moraceae | |
| marbled wildginger | Asarum marmoratum Piper | ASMA8 | Aristolochiaceae | |
| marbletree | Cassine xylocarpa Vent. | CAXY | Celastraceae | |
| Margarett's hawthorn | Crataegus margarettiae Ashe | CRMA4 | Rosaceae | |
| marguerite | Argyranthemum frutescens (L.) Schultz-Bip. | ARFR11 | Asteraceae | |
| maricao cimun | Byrsonima crassifolia (L.) Kunth | BYCR | Malpighiaceae | |
| Maricao lidflower | Calyptranthes peduncularis Alain | CAPE17 | Myrtaceae | |
| Maricopa milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. maricopae Barneby | ASLEM2 | Fabaceae | |
| Marietta hawthorn | Crataegus extraria Beadle | CREX3 | Rosaceae | |
| marigold | Calendula L. | CALEN | Asteraceae | |
| marijuana | Cannabis sativa L. | CASA3 | Cannabaceae | |
| marijuana | Cannabis sativa L. ssp. indica (Lam.) E. Small & Cronq. | CASAI | Cannabaceae | |
| marijuana | Cannabis sativa L. ssp. sativa | CASAS3 | Cannabaceae | |
| marijuana | Cannabis sativa L. ssp. sativa var. sativa | CASAS9 | Cannabaceae | |
| marijuana | Cannabis sativa L. ssp. sativa var. spontanea Vavilov | CASAS10 | Cannabaceae | |
| Mariposa clarkia | Clarkia biloba (Dur.) A. Nels. & J.F. Macbr. ssp. australis H.F. & M.E. Lewis | CLBIA | Onagraceae | |
| Mariposa cryptantha | Cryptantha mariposae I.M. Johnston | CRMA6 | Boraginaceae | |
| mariposa lily | Calochortus Pursh | CALOC | Liliaceae | |
| Mariposa manzanita | Arctostaphylos viscida Parry ssp. mariposa (Dudley) P.V. Wells | ARVIM | Ericaceae | |
| Mariposa pussypaws | Cistanthe pulchella (Eastw.) Hershkovitz | CIPU5 | Portulacaceae | |
| Mariposa sedge | Carex mariposana Bailey ex Mackenzie | CAMA13 | Cyperaceae | |
| maritime ceanothus | Ceanothus maritimus Hoover | CEMA | Rhamnaceae | |
| maritime saltbush | Atriplex acadiensis Taschereau | ATAC2 | Chenopodiaceae | |
| Marks' cyanea | Cyanea marksii Rock | CYMA14 | Campanulaceae | |
| marlberry | Ardisia japonica (Thunb.) Blume | ARJA4 | Myrsinaceae | |
| marlberry | Ardisia Sw. | ARDIS | Myrsinaceae | |
| Marrat's bryum moss | Bryum marratii Hook. f. & Wils. ex Wils. | BRMA9 | Bryaceae | |
| marsh bellflower | Campanula aparinoides Pursh | CAAP2 | Campanulaceae | |
| marsh flatsedge | Cyperus pseudovegetus Steud. | CYPS | Cyperaceae | |
| marsh marigold | Caltha L. | CALTH | Ranunculaceae | |
| marsh milkvetch | Astragalus pycnostachyus Gray | ASPY | Fabaceae | |
| marsh milkvetch | Astragalus pycnostachyus Gray var. lanosissimus (Rydb.) Munz & McBurney | ASPYL | Fabaceae | |
| marsh milkvetch | Astragalus pycnostachyus Gray var. pycnostachyus | ASPYP | Fabaceae | |
| marsh parsley | Cyclospermum Lag. | CYCLO4 | Apiaceae | |
| marsh parsley | Cyclospermum leptophyllum (Pers.) Sprague ex Britt. & P. Wilson | CYLE7 | Apiaceae | |
| marsh saltbush | Atriplex paludosa R. Br. | ATPA7 | Chenopodiaceae | |
| marsh sandwort | Arenaria paludicola B.L. Robins. | ARPA7 | Caryophyllaceae | |
| marsh straw sedge | Carex hormathodes Fern. | CAHO8 | Cyperaceae | |
| marsh thistle | Cirsium palustre (L.) Scop. | CIPA6 | Asteraceae | |
| marshland goosefoot | Chenopodium humile Hook. | CHHU | Chenopodiaceae | |
| marshmallow | Althaea L. | ALTHA | Malvaceae | |
| marshmeadow Indian paintbrush | Castilleja lineata Greene | CALI5 | Scrophulariaceae | |
| Marsh's dutchman's pipe | Aristolochia pentandra Jacq. | ARPE8 | Aristolochiaceae | |
| Martin's ceanothus | Ceanothus martinii M.E. Jones | CEMA2 | Rhamnaceae | |
| Martorell's lidflower | Calyptranthes martorellii Alain | CAMA25 | Myrtaceae | |
| Maryland goldenaster | Chrysopsis mariana (L.) Ell. | CHMA14 | Asteraceae | |
| Mason's ceanothus | Ceanothus masonii McMinn | CEMA3 | Rhamnaceae | |
| mat amaranth | Amaranthus blitoides S. Wats. | AMBL | Amaranthaceae | |
| mat milkvetch | Astragalus kentrophyta Gray var. tegetarius (S. Wats.) Dorn | ASKET | Fabaceae | |
| mat saltbush | Atriplex corrugata S. Wats. | ATCO4 | Chenopodiaceae | |
| mat sandbur | Cenchrus longispinus (Hack.) Fern. | CELO3 | Poaceae | |
| Matamoros saltbush | Atriplex matamorensis A. Nels. | ATMA | Chenopodiaceae | |
| matasano | Casimiroa tetrameria Millsp. | CATE24 | Rutaceae | |
| Mathis' spiderling | Boerhavia mathisiana F.B. Jones | BOMA5 | Nyctaginaceae | |
| mato | Caesalpinia ciliata (Bergius ex Wikstr.) Urban | CACI19 | Fabaceae | |
| matojillo bluestem | Andropogon leucostachyus Kunth | ANLE | Poaceae | |
| matricary grapefern | Botrychium matricariifolium (A. Braun ex Dowell) A. Braun ex Koch | BOMA2 | Ophioglossaceae | |
| matted grama | Bouteloua simplex Lag. | BOSI2 | Poaceae | |
| matted sandmat | Chamaesyce serpens (Kunth) Small | CHSE4 | Euphorbiaceae | |
| matted water-starwort | Callitriche peploides Nutt. | CAPE16 | Callitrichaceae | |
| Maui beggarticks | Bidens mauiensis (Gray) Sherff | BIMA4 | Asteraceae | |
| Maui chaff flower | Achyranthes splendens Mart. ex Moq. | ACSP3 | Amaranthaceae | |
| Maui chaff flower | Achyranthes splendens Mart. ex Moq. var. rotundata Hbd. | ACSPR2 | Amaranthaceae | |
| Maui chaff flower | Achyranthes splendens Mart. ex Moq. var. splendens | ACSPS | Amaranthaceae | |
| Maui clermontia | Clermontia micrantha (Hbd.) Rock | CLMI3 | Campanulaceae | |
| Maui cyanea | Cyanea comata Hbd. | CYCO11 | Campanulaceae | |
| Maui cyanea | Cyanea mauiensis (Rock) Lammers | CYMA24 | Campanulaceae | |
| Maui cyrtandra | Cyrtandra hashimotoi Rock | CYHA3 | Gesneriaceae | |
| Maui flatsedge | Cyperus neokunthianus Kükenth. | CYNE2 | Cyperaceae | |
| Maui kihifern | Adenophorus montanus (Hbd.) W.H. Wagner | ADMO3 | Grammitidaceae | |
| Maui mirrorplant | Coprosma ochracea Oliver | COOC3 | Rubiaceae | |
| Maui reedgrass | Calamagrostis expansa (Munro ex Hbd.) A.S. Hitchc. | CAEX | Poaceae | |
| Maui sedge | Carex thunbergii Steud. | CATH6 | Cyperaceae | |
| Maui wormwood | Artemisia mauiensis (Gray) Skottsberg | ARMA10 | Asteraceae | |
| Maule's quince | Chaenomeles japonica (Thunb.) Lindl. ex Spach | CHJA2 | Rosaceae | |
| Mauna Loa beggarticks | Bidens menziesii (Gray) Sherff | BIME | Asteraceae | |
| Mauna Loa beggarticks | Bidens menziesii (Gray) Sherff ssp. filiformis (Sherff) Ganders & Nagata | BIMEF2 | Asteraceae | |
| Mauna Loa beggarticks | Bidens menziesii (Gray) Sherff ssp. menziesii | BIMEM | Asteraceae | |
| Mauna Loa clermontia | Clermontia montis-loa Rock | CLMO5 | Campanulaceae | |
| maunaloa | Canavalia cathartica Thouars | CACA29 | Fabaceae | |
| Mauritanian grass | Ampelodesmos Link | AMPEL2 | Poaceae | |
| Mauritanian grass | Ampelodesmos mauritanicus (Poir.) T. Dur. & Schinz | AMMA5 | Poaceae | |
| Mauritian grass | Apluda L. | APLUD | Poaceae | |
| Mauritian grass | Apluda mutica L. | APMU2 | Poaceae | |
| mauve | Abutilon hulseanum (Torr. & Gray) Torr. ex Gray | ABHU | Malvaceae | |
| Maximowicz's saltbush | Atriplex maximowicziana Makino | ATMA8 | Chenopodiaceae | |
| may hawthorn | Crataegus aestivalis (Walt.) Torr. & Gray | CRAE | Rosaceae | |
| McEldowney's cyanea | Cyanea mceldowneyi Rock | CYMC | Campanulaceae | |
| Mcvicker's gilia | Aliciella mcvickerae (M.E. Jones) J.M. Porter | ALMC | Polemoniaceae | |
| meadow brome | Bromus biebersteinii Roemer & J.A. Schultes [excluded] | BRBI2 | Poaceae | |
| meadow brome | Bromus riparius Rehmann | BRRI7 | Poaceae | |
| meadow foxtail | Alopecurus pratensis L. | ALPR3 | Poaceae | |
| meadow garlic | Allium canadense L. | ALCA3 | Liliaceae | |
| meadow garlic | Allium canadense L. var. canadense | ALCAC | Liliaceae | |
| meadow garlic | Allium canadense L. var. ecristatum (M.E. Jones) Ownbey | ALCAE | Liliaceae | |
| meadow garlic | Allium canadense L. var. lavandulare (Bates) Ownbey & Aase | ALCAL | Liliaceae | |
| meadow garlic | Allium canadense L. var. mobilense (Regel) Ownbey | ALCAM | Liliaceae | |
| meadow jointvetch | Aeschynomene pratensis Small | AEPR | Fabaceae | |
| meadow knapweed | Centaurea ×moncktonii C. E. Britton | CEMO6 | Asteraceae | |
| meadow knapweed | Centaurea debeauxii Gren. & Godr. [excluded] | CEDE5 | Asteraceae | |
| meadow milkvetch | Astragalus diversifolius Gray | ASDI5 | Fabaceae | |
| meadow sedge | Carex praticola Rydb. | CAPR7 | Cyperaceae | |
| meadow thistle | Cirsium scariosum Nutt. | CISC2 | Asteraceae | |
| Meadow Valley sandwort | Arenaria stenomeres Eastw. | ARST3 | Caryophyllaceae | |
| Mead's milkweed | Asclepias meadii Torr. ex Gray | ASME | Asclepiadaceae | |
| Mead's sedge | Carex meadii Dewey | CAME2 | Cyperaceae | |
| mealy fumewort | Corydalis crystallina Engelm. | COCR2 | Fumariaceae | |
| mealy goosefoot | Chenopodium incanum (S. Wats.) Heller | CHIN2 | Chenopodiaceae | |
| mealy goosefoot | Chenopodium incanum (S. Wats.) Heller var. elatum Crawford | CHINE | Chenopodiaceae | |
| mealy goosefoot | Chenopodium incanum (S. Wats.) Heller var. incanum | CHINI | Chenopodiaceae | |
| mealy goosefoot | Chenopodium incanum (S. Wats.) Heller var. occidentale Crawford | CHINO | Chenopodiaceae | |
| Mecca myrrh | Commiphora opobalsamum (L.) Engler | COOP2 | Burseraceae | |
| medicineplant | Adenostemma J.R. & G. Forst. | ADENO4 | Asteraceae | |
| Mediterranean amaranth | Amaranthus graecizans L. | AMGR13 | Amaranthaceae | |
| Mediterranean brome | Bromus lanceolatus Roth | BRLA7 | Poaceae | |
| Mediterranean cabbage | Brassica fruticulosa Cyr. | BRFR3 | Brassicaceae | |
| Mediterranean crownvetch | Coronilla valentina L. | COVA4 | Fabaceae | |
| Mediterranean lineseed | Bellardia trixago (L.) All. | BETR | Scrophulariaceae | |
| Mediterranean onion | Allium paniculatum L. | ALPA20 | Liliaceae | |
| melegueta pepper | Aframomum melegueta Schumann | AFME | Zingiberaceae | |
| melon | Cucumis L. | CUCUM | Cucurbitaceae | |
| melon loco | Apodanthera undulata Gray | APUN | Cucurbitaceae | |
| melonleaf | Cayaponia Silva Manso | CAYAP | Cucurbitaceae | |
| Memphisgrass | Cutandia memphitica (Spreng.) K. Richt. | CUME2 | Poaceae | |
| Memphisgrass | Cutandia Willk. | CUTAN | Poaceae | |
| Menand's hawthorn | Crataegus menandiana Sarg. | CRME6 | Rosaceae | |
| Mendez's sandmat | Chamaesyce mendezii (Boiss.) Millsp. | CHME6 | Euphorbiaceae | |
| Mendocino ceanothus | Ceanothus ×mendocinensis McMinn [thyrsiflorus × velutinus] | CEME3 | Rhamnaceae | |
| Mendocino Coast Indian paintbrush | Castilleja mendocinensis (Eastw.) Pennell | CAME21 | Scrophulariaceae | |
| Mendocino sedge | Carex mendocinensis Olney | CAME5 | Cyperaceae | |
| Mendocino spineflower | Chorizanthe howellii Goodman | CHHO2 | Polygonaceae | |
| menteng | Baccaurea racemosa (Reinw.) Muell. Arg. | BARA3 | Euphorbiaceae | |
| Mentor barberry | Berberis ×mentorensis L. M. Ames | BEME2 | Berberidaceae | |
| Menzies' anacolia moss | Anacolia menziesii (Turn.) Par. | ANME9 | Bartramiaceae | |
| Menzies' anacolia moss | Anacolia menziesii (Turn.) Par. var. menziesii | ANMEM | Bartramiaceae | |
| Menzies' fiddleneck | Amsinckia menziesii (Lehm.) A. Nels. & J.F. Macbr. | AMME | Boraginaceae | |
| Menzies' fiddleneck | Amsinckia menziesii (Lehm.) A. Nels. & J.F. Macbr. var. menziesii | AMMEM2 | Boraginaceae | |
| Merced clarkia | Clarkia lingulata H.F. & M.E. Lewis | CLLI | Onagraceae | |
| Mertens' sedge | Carex mertensii Prescott ex Bong. | CAME6 | Cyperaceae | |
| metallic taro | Alocasia plumbea K. Koch ex Van Houtte | ALPL5 | Araceae | |
| Mexicali onion | Allium peninsulare J.G. Lemmon ex Greene | ALPE | Liliaceae | |
| Mexican alvaradoa | Alvaradoa amorphoides Liebm. | ALAM3 | Simaroubaceae | |
| Mexican alvaradoa | Alvaradoa amorphoides Liebm. ssp. psilophyllis (Urban) Cronq. | ALAMP2 | Simaroubaceae | |
| Mexican brassbuttons | Cotula mexicana (DC.) Cabrera | COME15 | Asteraceae | |
| Mexican buttonbush | Cephalanthus salicifolius Humb. & Bonpl. | CESA3 | Rubiaceae | |
| Mexican cancer-root | Conopholis alpina Liebm. var. mexicana (Gray ex S. Wats.) Haynes | COALM | Orobanchaceae | |
| Mexican candelina lichen | Candelina mexicana (de Lesd.) Poelt | CAME28 | Candelariaceae | |
| Mexican cologania | Cologania pulchella Kunth | COPU4 | Fabaceae | |
| Mexican copperleaf | Acalypha mexicana Muell.-Arg. | ACME7 | Euphorbiaceae | |
| Mexican croton | Croton ciliatoglandulifer Ortega | CRCI | Euphorbiaceae | |
| Mexican cryptantha | Cryptantha mexicana (Brandeg.) I.M. Johnston | CRME4 | Boraginaceae | |
| Mexican fern | Anemia mexicana Klotzsch | ANME | Anemiaceae | |
| Mexican hemlockparsley | Conioselinum mexicanum Coult. & Rose | COME2 | Apiaceae | |
| Mexican holdback | Caesalpinia mexicana Gray | CAME | Fabaceae | |
| Mexican Indian paintbrush | Castilleja mexicana (Hemsl.) Gray | CAME17 | Scrophulariaceae | |
| Mexican mosquitofern | Azolla mexicana Schlecht. & Cham. ex K. Presl | AZME | Azollaceae | |
| Mexican orange | Choisya dumosa (Torr.) Gray | CHDU | Rutaceae | |
| Mexican orange | Choisya dumosa (Torr.) Gray var. dumosa | CHDUD | Rutaceae | |
| Mexican orange | Choisya dumosa (Torr.) Gray var. mollis (Standl.) L. Benson | CHDUM | Rutaceae | |
| Mexican orange | Choisya Kunth | CHOIS | Rutaceae | |
| Mexican pricklypoppy | Argemone mexicana L. | ARME4 | Papaveraceae | |
| Mexican redbud | Cercis canadensis L. var. mexicana (Rose) M. Hopkins | CECAM | Fabaceae | |
| Mexican ricegrass | Achnatherum clandestinum (Hack.) Barkworth | ACCL7 | Poaceae | |
| Mexican sandmat | Chamaesyce gracillima (S. Wats.) Millsp. | CHGR17 | Euphorbiaceae | |
| Mexican saucerflower | Antiphytum heliotropioides A. DC. | ANHE4 | Boraginaceae | |
| Mexican scaly cloakfern | Astrolepis sinuata (Lag. ex Sw.) Benham & Windham ssp. mexicana Benham | ASSIM2 | Pteridaceae | |
| Mexican silverbush | Argythamnia astroplethos Ingram | ARAS4 | Euphorbiaceae | |
| Mexican swallow-wort | Cynanchum ligulatum (Benth.) Woods. | CYLI8 | Asclepiadaceae | |
| Mexican tea | Chenopodium ambrosioides L. | CHAM | Chenopodiaceae | |
| Mexican tea | Chenopodium ambrosioides L. var. ambrosioides | CHAMA16 | Chenopodiaceae | |
| Mexican tea | Chenopodium ambrosioides L. var. obovatum Speg. | CHAMO2 | Chenopodiaceae | |
| Mexican thistle | Cirsium mexicanum DC. | CIME4 | Asteraceae | |
| Mexican whorled milkweed | Asclepias fascicularis Dcne. | ASFA | Asclepiadaceae | |
| Mexican windmill grass | Chloris submutica Kunth | CHSU4 | Poaceae | |
| Mexican wrightwort | Carlowrightia mexicana Henrickson & Daniel | CAME18 | Acanthaceae | |
| Mexican yellowshow | Amoreuxia palmatifida Moc. & Sessé ex DC. | AMPA3 | Bixaceae | |
| Mexican-blue | Cornutia grandiflora (Schlecht. & Cham.) Schauer | COGR24 | Verbenaceae | |
| Mexican-hat-plant | Chiranthodendron pentadactylon Larreat. | CHPE13 | Sterculiaceae | |
| Meyen's flatsedge | Cyperus meyenianus Kunth | CYME4 | Cyperaceae | |
| Meyen's sedge | Carex meyenii Nees | CAME14 | Cyperaceae | |
| Michaux's croton | Croton michauxii G.L. Webster | CRMI8 | Euphorbiaceae | |
| Michaux's milkweed | Asclepias michauxii Dcne. | ASMI12 | Asclepiadaceae | |
| Michaux's sedge | Carex michauxiana Boeckl. | CAMI15 | Cyperaceae | |
| Michaux's wormwood | Artemisia michauxiana Bess. | ARMI4 | Asteraceae | |
| Michel's earth lichen | Catapyrenium michelii (A. Massal.) R. Sant. | CAMI40 | Verrucariaceae | |
| Middleton false foxglove | Agalinis neoscotica (Greene) Fern. | AGNE5 | Scrophulariaceae | |
| midland sedge | Carex mesochorea Mackenzie | CAME13 | Cyperaceae | |
| midsorus fern | Blechnum L. | BLECH | Blechnaceae | |
| Mildred's clarkia | Clarkia mildrediae (Heller) H.F. & M.E. Lewis | CLMI | Onagraceae | |
| Mildred's clarkia | Clarkia mildrediae (Heller) H.F. & M.E. Lewis ssp. lutescens Gottlieb & L.P. Janeway | CLMIL3 | Onagraceae | |
| Mildred's clarkia | Clarkia mildrediae (Heller) H.F. & M.E. Lewis ssp. mildrediae | CLMIM | Onagraceae | |
| milfoil wattle | Acacia millefolia S. Wats. | ACMI | Fabaceae | |
| milkberry | Chiococca P. Br. | CHIOC | Rubiaceae | |
| milkflower cotoneaster | Cotoneaster lacteus W.W. Smith | COLA18 | Rosaceae | |
| milkmaids | Cardamine californica (Nutt.) Greene | CACA39 | Brassicaceae | |
| milkmaids | Cardamine californica (Nutt.) Greene var. californica | CACAC3 | Brassicaceae | |
| milkmaids | Cardamine californica (Nutt.) Greene var. cardiophylla (Greene) Rollins | CACAC15 | Brassicaceae | |
| milkmaids | Cardamine californica (Nutt.) Greene var. cuneata (Nutt.) Rollins | CACAC16 | Brassicaceae | |
| milkmaids | Cardamine californica (Nutt.) Greene var. integrifolia (Nutt.) Rollins | CACAI3 | Brassicaceae | |
| milkmaids | Cardamine californica (Nutt.) Greene var. sinuata (Greene) O.E. Schulz | CACAS4 | Brassicaceae | |
| milkvetch | Astragalus edulis Durieu ex Bunge | ASED2 | Fabaceae | |
| milkvetch | Astragalus L. | ASTRA | Fabaceae | |
| milkweed | Asclepias L. | ASCLE | Asclepiadaceae | |
| milkweed milkvetch | Astragalus asclepiadoides M.E. Jones | ASAS2 | Fabaceae | |
| Mill Creek agoseris | Agoseris lackschewitzii D. Henderson & R. Moseley | AGLA9 | Asteraceae | |
| Millboro leather flower | Clematis viticaulis Steele | CLVI8 | Ranunculaceae | |
| Milo Baker's cryptantha | Cryptantha milo-bakeri I.M. Johnston | CRMI4 | Boraginaceae | |
| mimicking sandmat | Chamaesyce simulans (L.C. Wheeler) Mayfield | CHSI5 | Euphorbiaceae | |
| miner's candle | Cryptantha virgata (Porter) Payson | CRVI4 | Boraginaceae | |
| miner's lettuce | Claytonia perfoliata Donn ex Willd. | CLPE | Portulacaceae | |
| miner's lettuce | Claytonia perfoliata Donn ex Willd. ssp. intermontana J.M. Miller & K. Chambers | CLPEI | Portulacaceae | |
| miner's lettuce | Claytonia perfoliata Donn ex Willd. ssp. mexicana (Rydb.) J.M. Miller & K. Chambers | CLPEM | Portulacaceae | |
| miner's lettuce | Claytonia perfoliata Donn ex Willd. ssp. perfoliata | CLPEP | Portulacaceae | |
| Mingan moonwort | Botrychium minganense Victorin | BOMI | Ophioglossaceae | |
| miniature flatsedge | Cyperus prolifer Lam. | CYPR17 | Cyperaceae | |
| miniature suncup | Camissonia micrantha (Hornem. ex Spreng.) Raven | CAMI22 | Onagraceae | |
| mink hawthorn | Crataegus dispessa Ashe | CRDI9 | Rosaceae | |
| Minthorn's milkvetch | Astragalus minthorniae (Rydb.) Jepson | ASMI7 | Fabaceae | |
| Minthorn's milkvetch | Astragalus minthorniae (Rydb.) Jepson var. minthorniae | ASMIM2 | Fabaceae | |
| Minthorn's milkvetch | Astragalus minthorniae (Rydb.) Jepson var. villosus Barneby | ASMIV | Fabaceae | |
| minute hawthorn | Crataegus tristis Beadle | CRTR4 | Rosaceae | |
| Mirador green ladies'-tresses | Cyclopogon miradorense Schlechter | CYMI7 | Orchidaceae | |
| mirrorplant | Coprosma J.R. & G. Forst. | COPRO | Rubiaceae | |
| Miss Jones' hawthorn | Crataegus jonesiae Sarg. | CRJO3 | Rosaceae | |
| Miss Vail's hawthorn | Crataegus vailiae Britt. | CRVA | Rosaceae | |
| Mississippi hawthorn | Crataegus ancisa Beadle | CRAN9 | Rosaceae | |
| Missouri gourd | Cucurbita foetidissima Kunth | CUFO | Cucurbitaceae | |
| Missouri lambsquarters | Chenopodium album L. var. missouriense (Aellen) I.J. Bassett & C.W. Crompton | CHALM2 | Chenopodiaceae | |
| Missouri milkvetch | Astragalus missouriensis Nutt. | ASMI10 | Fabaceae | |
| Missouri milkvetch | Astragalus missouriensis Nutt. var. amphibolus Barneby | ASMIA | Fabaceae | |
| Missouri milkvetch | Astragalus missouriensis Nutt. var. humistratus Isely | ASMIH2 | Fabaceae | |
| Missouri milkvetch | Astragalus missouriensis Nutt. var. missouriensis | ASMIM5 | Fabaceae | |
| Missouri sedge | Carex missouriensis P. Rothr. & Reznicek | CAMI50 | Cyperaceae | |
| Mitchell's sedge | Carex mitchelliana M.A. Curtis | CAMI18 | Cyperaceae | |
| Moab milkvetch | Astragalus coltonii M.E. Jones var. moabensis M.E. Jones | ASCOM2 | Fabaceae | |
| moccasin flower | Cypripedium acaule Ait. | CYAC3 | Orchidaceae | |
| mock fanpetals | Allosidastrum (Hochr.) Krapov., Fryxell & Bates | ALLOS | Malvaceae | |
| mock fanpetals | Allosidastrum pyramidatum (Desportes ex Cav.) Krapov., Fryxell & Bates | ALPY | Malvaceae | |
| mock leopardbane | Arnica dealbata (Gray) B.G. Baldwin | ARDE11 | Asteraceae | |
| mock parsley | Apiastrum angustifolium Nutt. | APAN | Apiaceae | |
| mockernut hickory | Carya alba (L.) Nutt. ex Ell. | CAAL27 | Juglandaceae | |
| modest prickle grass | Crypsis vaginiflora (Forssk.) Opiz | CRVA2 | Poaceae | |
| Modoc cypress | Cupressus bakeri Jepson | CUBA | Cupressaceae | |
| Modoc hawksbeard | Crepis modocensis Greene | CRMO4 | Asteraceae | |
| Modoc hawksbeard | Crepis modocensis Greene ssp. glareosa (Piper) Babcock & Stebbins | CRMOG3 | Asteraceae | |
| Modoc hawksbeard | Crepis modocensis Greene ssp. modocensis | CRMOM | Asteraceae | |
| Modoc hawksbeard | Crepis modocensis Greene ssp. rostrata (Coville) Babcock & Stebbins | CRMOR | Asteraceae | |
| Modoc hawksbeard | Crepis modocensis Greene ssp. subacaulis (Kellogg) Babcock & Stebbins | CRMOS | Asteraceae | |
| Moenkopi milkvetch | Astragalus moencoppensis M.E. Jones | ASMO4 | Fabaceae | |
| Mogollon thistle | Cirsium parryi (Gray) Petrak ssp. mogollonicum C. Schaack & G. Goodwin | CIPAM | Asteraceae | |
| Mohr's bluestem | Andropogon mohrii (Hack.) Hack. ex Vasey | ANMO3 | Poaceae | |
| Mohr's threeawn | Aristida mohrii Nash | ARMO3 | Poaceae | |
| Mojave brickellbush | Brickellia oblongifolia Nutt. | BROB | Asteraceae | |
| Mojave brickellbush | Brickellia oblongifolia Nutt. var. oblongifolia | BROBO | Asteraceae | |
| Mojave ceanothus | Ceanothus greggii Gray var. vestitus (Greene) McMinn | CEGRV | Rhamnaceae | |
| Mojave cleomella | Cleomella obtusifolia Torr. & Frém. | CLOB | Capparaceae | |
| Mojave cryptantha | Cryptantha mohavensis (Greene) Greene | CRMO7 | Boraginaceae | |
| Mojave fringed onion | Allium fimbriatum S. Wats. var. mohavense (Tidestrom) Jepson | ALFIM | Liliaceae | |
| Mojave Indian paintbrush | Castilleja plagiotoma Gray | CAPL7 | Scrophulariaceae | |
| Mojave milkvetch | Astragalus mohavensis S. Wats. | ASMO5 | Fabaceae | |
| Mojave milkvetch | Astragalus mohavensis S. Wats. var. hemigyrus (Clokey) Barneby | ASMOH | Fabaceae | |
| Mojave milkvetch | Astragalus mohavensis S. Wats. var. mohavensis | ASMOM4 | Fabaceae | |
| Mojave milkweed | Asclepias nyctaginifolia Gray | ASNY | Asclepiadaceae | |
| Mojave pricklypoppy | Argemone corymbosa Greene | ARCO6 | Papaveraceae | |
| Mojave pricklypoppy | Argemone corymbosa Greene ssp. arenicola G.B. Ownbey | ARCOA | Papaveraceae | |
| Mojave pricklypoppy | Argemone corymbosa Greene ssp. corymbosa | ARCOC6 | Papaveraceae | |
| Mojave sand verbena | Abronia pogonantha Heimerl | ABPO | Nyctaginaceae | |
| Mojave sandwort | Arenaria macradenia S. Wats. | ARMA3 | Caryophyllaceae | |
| Mojave sandwort | Arenaria macradenia S. Wats. ssp. macradenia | ARMAM | Caryophyllaceae | |
| Mojave sandwort | Arenaria macradenia S. Wats. ssp. macradenia var. arcuifolia Maguire | ARMAA2 | Caryophyllaceae | |
| Mojave sandwort | Arenaria macradenia S. Wats. ssp. macradenia var. macradenia | ARMAM4 | Caryophyllaceae | |
| Mojave spineflower | Chorizanthe spinosa S. Wats. | CHSP | Polygonaceae | |
| Mojave suncup | Camissonia campestris (Greene) Raven | CACA33 | Onagraceae | |
| Mojave suncup | Camissonia campestris (Greene) Raven ssp. campestris | CACAC8 | Onagraceae | |
| Mojave thistle | Cirsium mohavense (Greene) Petrak | CIMO | Asteraceae | |
| Mokiak milkvetch | Astragalus mokiacensis Gray | ASMO6 | Fabaceae | |
| mollusc ctenidium moss | Ctenidium molluscum (Hedw.) Mitt. | CTMO | Hypnaceae | |
| Molokai beggarticks | Bidens molokaiensis (Hbd.) Sherff | BIMO | Asteraceae | |
| Molokai cyanea | Cyanea procera Hbd. | CYPR8 | Campanulaceae | |
| Molokai cyrtandra | Cyrtandra biserrata Hbd. | CYBI3 | Gesneriaceae | |
| Molokai flatsedge | Cyperus phleoides (Nees ex Kunth) Hbd. | CYPH2 | Cyperaceae | |
| Molokai flatsedge | Cyperus phleoides (Nees ex Kunth) Hbd. var. hawaiensis (Mann) Kükenth. | CYPHH | Cyperaceae | |
| Molokai flatsedge | Cyperus phleoides (Nees ex Kunth) Hbd. var. phleoides | CYPHP | Cyperaceae | |
| Molokai jackbean | Canavalia molokaiensis O.& I. Deg. & Sauer | CAMO15 | Fabaceae | |
| Molokai mirrorplant | Coprosma ternata Oliver | COTE8 | Rubiaceae | |
| Molokai ohaha | Brighamia rockii St. John | BRRO | Campanulaceae | |
| Molokai sedge | Carex montis-eeka Hbd. | CAMO12 | Cyperaceae | |
| molybdenum cracked lichen | Acarospora molybdina (Wahlenb.) Trevisan | ACMO6 | Acarosporaceae | |
| Mona Island sandmat | Chamaesyce orbifolia Alain | CHOR6 | Euphorbiaceae | |
| Mona Island swallow-wort | Cynanchum monense (Britt.) Alain | CYMO6 | Asclepiadaceae | |
| Mona Island thoroughwort | Chromolaena oteroi (Monachino) King & H.E. Robins. | CHOT | Asteraceae | |
| monarch birch | Betula maximowicziana Regel | BEMA5 | Betulaceae | |
| monarch redstem | Ammannia baccifera L. | AMBA3 | Lythraceae | |
| monarch thistle | Cirsium chuskaense Moore & Frankton | CICH3 | Asteraceae | |
| money croton | Croton nummulariifolius A. Rich. | CRNU3 | Euphorbiaceae | |
| moneywort | Alysicarpus Neck. ex Desv. | ALYSI | Fabaceae | |
| monkey Jack | Artocarpus rigidus Blume | ARRI4 | Moraceae | |
| monkeybush | Abutilon indicum (L.) Sweet | ABIN3 | Malvaceae | |
| monkeyflower savory | Clinopodium mimuloides (Benth.) Kuntze | CLMI9 | Lamiaceae | |
| monkeypuzzle tree | Araucaria araucana (Molina) K. Koch | ARAR23 | Araucariaceae | |
| monkshood | Aconitum L. | ACONI | Ranunculaceae | |
| monkshoodvine | Ampelopsis aconitifolia Bunge | AMAC4 | Vitaceae | |
| Monnier's snowparsley | Cnidium monnieri (L.) Cusson ex Juss. | CNMO | Apiaceae | |
| Mono Hot Springs evening-primrose | Camissonia sierrae Raven ssp. alticola Raven | CASIA | Onagraceae | |
| Mono locoweed | Astragalus lentiginosus Dougl. ex Hook. var. sesquimetralis (Rydb.) Barneby | ASLES4 | Fabaceae | |
| Mono milkvetch | Astragalus monoensis Barneby | ASMO9 | Fabaceae | |
| Montara manzanita | Arctostaphylos montaraensis J.B. Roof | ARMO5 | Ericaceae | |
| montbretia | Crocosmia ×crocosmiiflora (V. Lemoine) N.E. Br. [aurea × pottsii] | CRCR6 | Iridaceae | |
| Monte Neva Indian paintbrush | Castilleja salsuginosa N. Holmgren | CASA20 | Scrophulariaceae | |
| Monterey ceanothus | Ceanothus cuneatus (Hook.) Nutt. var. rigidus (Nutt.) Hoover | CECUR2 | Rhamnaceae | |
| Monterey cypress | Cupressus macrocarpa Hartw. ex Gord. | CUMA2 | Cupressaceae | |
| Monterey Indian paintbrush | Castilleja latifolia Hook. & Arn. | CALA26 | Scrophulariaceae | |
| Monterey manzanita | Arctostaphylos montereyensis Hoover | ARMO6 | Ericaceae | |
| Monterey mariposa lily | Calochortus uniflorus Hook. & Arn. | CAUN | Liliaceae | |
| Monterey spineflower | Chorizanthe pungens Benth. | CHPU3 | Polygonaceae | |
| Monterey spineflower | Chorizanthe pungens Benth. var. pungens | CHPUP3 | Polygonaceae | |
| Montgomery hawthorn | Crataegus arborea Beadle | CRAR6 | Rosaceae | |
| Monti's milkvetch | Astragalus limnocharis Barneby var. montii (Welsh) Isely | ASLIM | Fabaceae | |
| Montpelier cistus | Cistus monspeliensis L. | CIMO7 | Cistaceae | |
| Monument Valley milkvetch | Astragalus monumentalis Barneby | ASMO10 | Fabaceae | |
| Monument Valley milkvetch | Astragalus monumentalis Barneby var. monumentalis | ASMOM6 | Fabaceae | |
| Moore's brake | Anopteris hexagona (L.) C. Christens. | ANHE2 | Pteridaceae | |
| Moore's brake | Anopteris hexagona (L.) C. Christens. ssp. intermedia Morton | ANHEI | Pteridaceae | |
| Moraccan oat | Avena maroccana Gand. | AVMA | Poaceae | |
| Moran's manzanita | Arctostaphylos moranii P.V. Wells [excluded] | ARMO12 | Ericaceae | |
| Moreton Bay pine | Araucaria cunninghamii Aiton ex D. Don | ARCU7 | Araucariaceae | |
| Mormon needlegrass | Achnatherum aridum (M.E. Jones) Barkworth | ACAR14 | Poaceae | |
| morning-glory begonia | Begonia convolvulacea A. DC. | BECO2 | Begoniaceae | |
| Morocco knapweed | Cyanopsis muricata (L.) Dostál | CYMU7 | Asteraceae | |
| morrito | Crescentia alata Kunth | CRAL11 | Bignoniaceae | |
| Morro manzanita | Arctostaphylos morroensis Wies. & Schreib. | ARMO2 | Ericaceae | |
| Morro milkvetch | Astragalus curtipes Gray | ASCU3 | Fabaceae | |
| Morton's Canadian milkvetch | Astragalus canadensis L. var. mortonii (Nutt.) S. Wats. | ASCAM3 | Fabaceae | |
| Mosquin's clarkia | Clarkia mosquinii E. Small | CLMO3 | Onagraceae | |
| mosquito flatsedge | Cyperus prolixus Kunth | CYPR2 | Cyperaceae | |
| mosquito plant | Agastache cana (Hook.) Woot. & Standl. | AGCA | Lamiaceae | |
| mosquitofern | Azolla Lam. | AZOLL | Azollaceae | |
| moss pygmyweed | Crassula tillaea Lester-Garland | CRTI | Crassulaceae | |
| mossgrass | Coleanthus Seidel | COLEA | Poaceae | |
| mossgrass | Coleanthus subtilis (Tratt.) Seidel | COSU | Poaceae | |
| mottled dutchman's pipe | Aristolochia labiata Willd. | ARLA24 | Aristolochiaceae | |
| Mougeot's amphidium moss | Amphidium mougeotii (Bruch & Schimp. in B.S.G.) Schimp. | AMMO70 | Orthotrichaceae | |
| mound saltbush | Atriplex obovata Moq. | ATOB | Chenopodiaceae | |
| moundscale | Atriplex ×aptera A. Nels. (pro sp.) [canescens × nutallii] | ATAP | Chenopodiaceae | |
| Mount Diablo fairy-lantern | Calochortus pulchellus Dougl. ex Benth. | CAPU2 | Liliaceae | |
| Mount Diablo manzanita | Arctostaphylos auriculata Eastw. | ARAU | Ericaceae | |
| mountain alder | Alnus viridis (Chaix) DC. ssp. crispa (Ait.) Turrill | ALVIC | Betulaceae | |
| mountain alsinidendron | Alsinidendron trinerve Mann | ALTR5 | Caryophyllaceae | |
| mountain arnica | Arnica montana L. | ARMO8 | Asteraceae | |
| mountain aster | Canadanthus Nesom | CANAD | Asteraceae | |
| mountain bentgrass | Agrostis variabilis Rydb. | AGVA | Poaceae | |
| mountain big sagebrush | Artemisia tridentata Nutt. ssp. vaseyana (Rydb.) Beetle | ARTRV | Asteraceae | |
| mountain brome | Bromus marginatus Nees ex Steud. | BRMA4 | Poaceae | |
| mountain bugbane | Actaea podocarpa DC. | ACPO11 | Ranunculaceae | |
| mountain clarkia | Clarkia heterandra (Torr.) Lewis & Raven | CLHE4 | Onagraceae | |
| mountain clauzadea lichen | Clauzadea monticola (Ach. ex Schaerer) Hafellner & Bellem. | CLMO9 | Porpidiaceae | |
| mountain cryptantha | Cryptantha cana (A. Nels.) Payson | CRCA8 | Boraginaceae | |
| mountain cyrtandra | Cyrtandra dentata St. John & Storey | CYDE4 | Gesneriaceae | |
| mountain dodder | Cuscuta suksdorfii Yuncker | CUSU3 | Cuscutaceae | |
| mountain dodder | Cuscuta suksdorfii Yuncker var. subpedicellata Yuncker | CUSUS | Cuscutaceae | |
| mountain dodder | Cuscuta suksdorfii Yuncker var. suksdorfii | CUSUS2 | Cuscutaceae | |
| mountain ebony | Bauhinia variegata L. | BAVA | Fabaceae | |
| mountain false indigo | Amorpha glabra Desf. ex Poir. | AMGL2 | Fabaceae | |
| mountain harebell | Campanula lasiocarpa Cham. | CALA7 | Campanulaceae | |
| mountain hawksbeard | Crepis monticola Coville | CRMO5 | Asteraceae | |
| mountain heather | Cassiope D. Don | CASSI3 | Ericaceae | |
| mountain Indian paintbrush | Castilleja parviflora Bong. | CAPA26 | Scrophulariaceae | |
| mountain lady's slipper | Cypripedium montanum Dougl. ex Lindl. | CYMO2 | Orchidaceae | |
| mountain mahogany | Cercocarpus Kunth | CERCO | Rosaceae | |
| mountain maple | Acer spicatum Lam. | ACSP2 | Aceraceae | |
| mountain marlberry | Ardisia luquillensis (Britt.) Alain | ARLU3 | Myrsinaceae | |
| mountain melonleaf | Cayaponia racemosa (P. Mill.) Cogn. | CARA10 | Cucurbitaceae | |
| mountain misery | Chamaebatia Benth. | CHAMA | Rosaceae | |
| mountain misery | Chamaebatia foliolosa Benth. | CHFO | Rosaceae | |
| mountain moonwort | Botrychium montanum W.H. Wagner | BOMO | Ophioglossaceae | |
| mountain oat grass | Calamagrostis avenoides (Hook. f.) Cockayne | CAAV | Poaceae | |
| mountain papaya | Carica pubescens (A. DC.) Solms-Laub. | CAPU39 | Caricaceae | |
| mountain paper birch | Betula papyrifera Marsh. var. cordifolia (Regel) Fern. | BEPAC2 | Betulaceae | |
| mountain rockcress | Arabis hirsuta (L.) Scop. var. glabrata Torr. & Gray | ARHIG | Brassicaceae | |
| mountain sandwort | Arenaria montana L. | ARMO10 | Caryophyllaceae | |
| mountain saucerflower | Crusea Cham. & Schlecht. | CRUSE | Rubiaceae | |
| mountain saucerflower | Crusea diversifolia (Kunth) W.A. Anderson | CRDI12 | Rubiaceae | |
| mountain sedge | Carex scopulorum Holm | CASC12 | Cyperaceae | |
| mountain sedge | Carex scopulorum Holm var. bracteosa (Bailey) F.J. Herm. | CASCB | Cyperaceae | |
| mountain sedge | Carex scopulorum Holm var. scopulorum | CASCS2 | Cyperaceae | |
| mountain slope thistle | Cirsium scapanolepis Petrak | CISC | Asteraceae | |
| mountain snailfern | Cochlidium jungens Bishop | COJU | Grammitidaceae | |
| mountain soursop | Annona montana Macfad. | ANMO | Annonaceae | |
| mountain spleenwort | Asplenium montanum Willd. | ASMO2 | Aspleniaceae | |
| mountain springparsley | Cymopterus montanus Nutt. ex Torr. & Gray | CYMO | Apiaceae | |
| mountain sweetpepperbush | Clethra acuminata Michx. | CLAC3 | Clethraceae | |
| mountain thimbleweed | Anemone lancifolia Pursh | ANLA | Ranunculaceae | |
| mountain thistle | Cirsium scopulorum (Greene) Cockerell ex Daniels | CISC3 | Asteraceae | |
| mountain torchwood | Amyris madrensis S. Wats. | AMMA3 | Rutaceae | |
| mountainbay | Calyptranthes Sw. | CALYP3 | Myrtaceae | |
| mountainside Indian paintbrush | Castilleja crista-galli Rydb. | CACR13 | Scrophulariaceae | |
| mourning milkvetch | Astragalus atratus S. Wats. | ASAT | Fabaceae | |
| mourning milkvetch | Astragalus atratus S. Wats. var. atratus | ASATA | Fabaceae | |
| mourning milkvetch | Astragalus atratus S. Wats. var. mensanus M.E. Jones | ASATM | Fabaceae | |
| mourning-cypress | Chamaecyparis funebris (Endl.) Franco | CHFU6 | Cupressaceae | |
| mouse-ear chickweed | Cerastium L. | CERAS | Caryophyllaceae | |
| mouseear cress | Arabidopsis thaliana (L.) Heynh. | ARTH | Brassicaceae | |
| mouse's eye | Bernardia myricifolia (Scheele) S. Wats. | BEMY | Euphorbiaceae | |
| Mt Hamilton thistle | Cirsium fontinale (Greene) Jepson var. campylon (H.K. Sharsmith) Pilz ex Keil & C. Turner | CIFOC | Asteraceae | |
| Mt. Davis brickellbush | Brickellia parvula Gray | BRPA | Asteraceae | |
| Mt. Dellenbaugh sandwort | Arenaria aberrans M.E. Jones | ARAB | Caryophyllaceae | |
| Mt. Diablo bird's-beak | Cordylanthus nidularius J.T. Howell | CONI2 | Scrophulariaceae | |
| Mt. Diablo milkvetch | Astragalus oxyphysus Gray | ASOX | Fabaceae | |
| Mt. Hamilton bellflower | Campanula sharsmithiae Morin | CASH4 | Campanulaceae | |
| Mt. Hamilton Indian paintbrush | Castilleja dissitiflora N. Holmgren | CADI20 | Scrophulariaceae | |
| Mt. Hamilton tickseed | Coreopsis hamiltonii (Elmer) H.K. Sharsmith | COHA2 | Asteraceae | |
| Mt. Hood bugbane | Actaea laciniata (S. Wats.) J. Compton | ACLA12 | Ranunculaceae | |
| Mt. Hood pussypaws | Cistanthe umbellata (Torr.) Hershkovitz | CIUM | Portulacaceae | |
| Mt. Hood pussypaws | Cistanthe umbellata (Torr.) Hershkovitz var. caudicifera (Gray) Kartesz & Gandhi | CIUMC | Portulacaceae | |
| Mt. Hood pussypaws | Cistanthe umbellata (Torr.) Hershkovitz var. umbellata | CIUMU | Portulacaceae | |
| Mt. Kaala cyanea | Cyanea superba (Cham.) Gray | CYSU8 | Campanulaceae | |
| Mt. Kaala cyanea | Cyanea superba (Cham.) Gray ssp. regina (Wawra) Lammers | CYSUR | Campanulaceae | |
| Mt. Kaala cyanea | Cyanea superba (Cham.) Gray ssp. superba | CYSUS | Campanulaceae | |
| Mt. Kahili beggarticks | Bidens valida Sherff | BIVA | Asteraceae | |
| Mt. Lassen clarkia | Clarkia lassenensis (Eastw.) H.F. & M.E. Lewis | CLLA | Onagraceae | |
| Mt. Mazama collomia | Collomia mazama Coville | COMA | Polemoniaceae | |
| Mt. Sapphire rockcress | Arabis fecunda Rollins | ARFE6 | Brassicaceae | |
| Mt. Shasta arnica | Arnica viscosa Gray | ARVI6 | Asteraceae | |
| Mt. Tamalpais manzanita | Arctostaphylos hookeri G. Don ssp. montana (Eastw.) P.V. Wells | ARHOM | Ericaceae | |
| Mt. Vision ceanothus | Ceanothus gloriosus J.T. Howell var. porrectus J.T. Howell | CEGLP | Rhamnaceae | |
| mucilage manjack | Cordia sulcata DC. | COSU3 | Boraginaceae | |
| mud sedge | Carex limosa L. | CALI7 | Cyperaceae | |
| Muehlenbeck's bryum moss | Bryum muehlenbeckii Bruch & Schimp. in B.S.G. | BRMU6 | Bryaceae | |
| Muehlenberg's astomum moss | Astomum muehlenbergianum (Sw.) Grout | ASMU7 | Pottiaceae | |
| Mueller's saltbush | Atriplex muelleri Benth. | ATMU | Chenopodiaceae | |
| Muhlenberg maidencane | Amphicarpum muehlenbergianum (J.A. Schultes) A.S. Hitchc. | AMMU2 | Poaceae | |
| Muhlenberg's centaury | Centaurium muehlenbergii (Griseb.) W. Wight ex Piper | CEMU2 | Gentianaceae | |
| Muhlenberg's sedge | Carex muehlenbergii Schkuhr ex Willd. | CAMU4 | Cyperaceae | |
| Muhlenberg's sedge | Carex muehlenbergii Schkuhr ex Willd. var. enervis Boott | CAMUE | Cyperaceae | |
| Muhlenberg's sedge | Carex muehlenbergii Schkuhr ex Willd. var. muehlenbergii | CAMUM | Cyperaceae | |
| Muir's raillardiopsis | Carlquistia muirii (Gray) B.G. Baldwin | CAMU27 | Asteraceae | |
| Mule Mountain brickellbush | Asanthus squamulosus (Gray) King & H.E. Robins. | ASSQ | Asteraceae | |
| mule's fat | Baccharis salicifolia (Ruiz & Pavón) Pers. | BASA4 | Asteraceae | |
| Mulford's milkvetch | Astragalus mulfordiae M.E. Jones | ASMU | Fabaceae | |
| mulga | Acacia aneura F. Muell. ex Benth. | ACAN10 | Fabaceae | |
| Munci's rockcress | Arabis pulchra M.E. Jones ex S. Wats. var. munciensis M.E. Jones | ARPUM | Brassicaceae | |
| muneco | Cordia borinquensis Urban | COBO3 | Boraginaceae | |
| Munro's cyanea | Cyanea munroi (Hosaka) Lammers | CYMU10 | Campanulaceae | |
| Munz's cholla | Cylindropuntia munzii (C.B. Wolf) Backeberg | CYMU12 | Cactaceae | |
| Munz's mariposa lily | Calochortus palmeri S. Wats. var. munzii Ownbey | CAPAM | Liliaceae | |
| Munz's onion | Allium munzii (Ownbey ex Traub) McNeal | ALMU6 | Liliaceae | |
| Murdock's thistle | Cirsium murdockii (Welsh) Cronq. | CIMU2 | Asteraceae | |
| Murphey's century plant | Agave murpheyi F. Gibson | AGMU | Agavaceae | |
| Murray's birch | Betula murrayana Barnes & Dancik | BEMU2 | Betulaceae | |
| Murray's rockcress | Arabis murrayi G. Mulligan | ARMU6 | Brassicaceae | |
| musk okra | Abelmoschus moschatus Medik. | ABMO | Malvaceae | |
| Muskingum sedge | Carex muskingumensis Schwein. | CAMU9 | Cyperaceae | |
| muskroot | Adoxa moschatellina L. | ADMO | Adoxaceae | |
| Mussentuchit Creek gilia | Aliciella tenuis (F.G. Sm. & Neese) J.M. Porter | ALTE12 | Polemoniaceae | |
| mustard | Brassica cretica Lam. | BRCR4 | Brassicaceae | |
| mustard | Brassica L. | BRASS2 | Brassicaceae | |
| mustard | Brassica rupestris Raf. | BRRU3 | Brassicaceae | |
| Mutis' flatsedge | Cyperus mutisii (Kunth) Griseb. | CYMU4 | Cyperaceae | |
| myall acacia | Acacia pendula A. Cunn. ex G. Don | ACPE8 | Fabaceae | |
| Myrin's aspicilia | Aspicilia myrinii (Fr.) Stein | ASMY2 | Hymeneliaceae | |
| myrrh | Commiphora Jacq. | COMMI2 | Burseraceae | |
| myrtle of the river | Calyptranthes zuzygium (L.) Sw. | CAZU | Myrtaceae | |
| myrtlecroton | Bernardia P. Mill. | BERNA | Euphorbiaceae |
Source: U. S. Department of Agriculture
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