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Plant List
Indexed Alphabetically by Common Name
P-Q
For a list of plants indexed by Scientific Name, click here
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| National Common Name | Scientific Name with Author | Symbol | Family | |
| pacaya | Chamaedorea costaricana Oerst. | CHCO27 | Arecaceae | |
| Pacific alpine wormwood | Artemisia glomerata Ledeb. | ARGL9 | Asteraceae | |
| Pacific alpine wormwood | Artemisia glomerata Ledeb. var. glomerata | ARGLG | Asteraceae | |
| Pacific alpine wormwood | Artemisia glomerata Ledeb. var. subglabrata Hultén | ARGLS | Asteraceae | |
| Pacific anemone | Anemone multifida Poir. | ANMU | Ranunculaceae | |
| Pacific anemone | Anemone multifida Poir. var. ?hirsuta C.L. Hitchc. | ANMUH | Ranunculaceae | |
| Pacific anemone | Anemone multifida Poir. var. multifida Poir. [excluded] | ANMUM3 | Ranunculaceae | |
| Pacific anemone | Anemone multifida Poir. var. stylosa (A. Nels.) Dutton & Keener | ANMUS5 | Ranunculaceae | |
| Pacific bentgrass | Agrostis avenacea J.F. Gmel. | AGAV | Poaceae | |
| Pacific brachythecium moss | Brachythecium reflexum (Starke in Web. & Mohr) Schimp. in B.S.G. var. pacificum Ren. & Card. in Röll | BRREP | Brachytheciaceae | |
| Pacific bristlystalked sedge | Carex leptalea Wahlenb. ssp. pacifica Calder & Taylor | CALEP2 | Cyperaceae | |
| Pacific brome | Bromus pacificus Shear | BRPA3 | Poaceae | |
| Pacific brownish sedge | Carex brunnescens (Pers.) Poir. ssp. pacifica Kalela | CABRP2 | Cyperaceae | |
| Pacific coralroot | Corallorhiza mertensiana Bong. | COME17 | Orchidaceae | |
| Pacific cyrtandra | Cyrtandra grayana Hbd. | CYGR6 | Gesneriaceae | |
| Pacific dogwood | Cornus nuttallii Audubon ex Torr. & Gray | CONU4 | Cornaceae | |
| Pacific false bindweed | Calystegia purpurata (Greene) Brummitt | CAPU18 | Convolvulaceae | |
| Pacific false bindweed | Calystegia purpurata (Greene) Brummitt ssp. purpurata | CAPUP2 | Convolvulaceae | |
| Pacific false bindweed | Calystegia purpurata (Greene) Brummitt ssp. saxicola (Eastw.) Brummitt | CAPUS | Convolvulaceae | |
| Pacific foxtail | Alopecurus saccatus Vasey | ALSA3 | Poaceae | |
| Pacific golden saxifrage | Chrysosplenium glechomifolium Nutt. | CHGL5 | Saxifragaceae | |
| Pacific hemlockparsley | Conioselinum gmelinii (Cham. & Schlecht.) Steud. | COGM | Apiaceae | |
| Pacific hound's tongue | Cynoglossum grande Dougl. ex Lehm. | CYGR | Boraginaceae | |
| Pacific island flatsedge | Cyperus cyperoides (L.) Kuntze | CYCY2 | Cyperaceae | |
| Pacific lacefern | Ctenitis squamigera (Hook. & Arn.) Copeland | CTSQ | Dryopteridaceae | |
| Pacific madrone | Arbutus menziesii Pursh | ARME | Ericaceae | |
| Pacific manzanita | Arctostaphylos pacifica J.B. Roof | ARPA19 | Ericaceae | |
| Pacific mosquitofern | Azolla filiculoides Lam. | AZFI | Azollaceae | |
| Pacific onion | Allium validum S. Wats. | ALVA | Liliaceae | |
| Pacific reedgrass | Calamagrostis nutkaensis (J. Presl) J. Presl ex Steud. | CANU | Poaceae | |
| Pacific reindeer lichen | Cladina portentosa (Dufour) Follmann ssp. pacifica (Ahti) Ahti | CLPOP | Cladoniaceae | |
| Pacific serviceberry | Amelanchier interior Nielsen | AMIN2 | Rosaceae | |
| Pacific silver fir | Abies amabilis (Dougl. ex Loud.) Dougl. ex Forbes | ABAM | Pinaceae | |
| Pacific silverweed | Argentina egedii (Wormsk.) Rydb. | AREG | Rosaceae | |
| Pacific silverweed | Argentina egedii (Wormsk.) Rydb. ssp. egedii | AREGE | Rosaceae | |
| Pacific silverweed | Argentina egedii (Wormsk.) Rydb. ssp. groenlandica (Tratt.) A. Löve | AREGG | Rosaceae | |
| Pacific springbeauty | Claytonia lanceolata Pall. ex Pursh var. pacifica McNeill | CLLAP | Portulacaceae | |
| Pacific yarrow | Achillea millefolium L. var. pacifica (Rydb.) G.N. Jones | ACMIP | Asteraceae | |
| Packard's milkvetch | Astragalus cusickii Gray var. packardiae Barneby | ASCUP | Fabaceae | |
| Packard's wormwood | Artemisia packardiae J. Grimes & Ertter | ARPA20 | Asteraceae | |
| Padang cassia | Cinnamomum burmannii (Nees & Th. Nees) Nees ex Blume | CIBU2 | Lauraceae | |
| Paddo rockcress | Arabis lemmonii S. Wats. var. paddoensis Rollins | ARLEP | Brassicaceae | |
| pagoda-plant | Blephilia Raf. | BLEPH5 | Lamiaceae | |
| pagumpa milkvetch | Astragalus ensiformis M.E. Jones | ASEN4 | Fabaceae | |
| pagumpa milkvetch | Astragalus ensiformis M.E. Jones var. ensiformis | ASENE | Fabaceae | |
| pagumpa milkvetch | Astragalus ensiformis M.E. Jones var. gracilior Barneby | ASENG | Fabaceae | |
| pahuen | Adesmia microphylla Hook. & Arn. | ADMI2 | Fabaceae | |
| painted buckeye | Aesculus sylvatica Bartr. | AESY | Hippocastanaceae | |
| painted desert milkvetch | Astragalus sophoroides M.E. Jones | ASSO4 | Fabaceae | |
| painted milkvetch | Astragalus ceramicus Sheldon | ASCE | Fabaceae | |
| painted milkvetch | Astragalus ceramicus Sheldon var. apus Barneby | ASCEA | Fabaceae | |
| painted milkvetch | Astragalus ceramicus Sheldon var. ceramicus | ASCEC | Fabaceae | |
| painted milkvetch | Astragalus ceramicus Sheldon var. filifolius (Gray) F.J. Herm. | ASCEF | Fabaceae | |
| paintedtongue | Bouchetia erecta DC. | BOER3 | Solanaceae | |
| Paiute cypress | Cupressus arizonica Greene ssp. nevadensis (Abrams) E. Murray | CUARN2 | Cupressaceae | |
| Paiute false bindweed | Calystegia longipes (S. Wats.) Brummitt | CALO12 | Convolvulaceae | |
| Paiute suncup | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven | CASC18 | Onagraceae | |
| Paiute suncup | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven ssp. brachycarpa (Raven) Raven | CASCB2 | Onagraceae | |
| Paiute suncup | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven ssp. macrocarpa (Raven) Raven | CASCM | Onagraceae | |
| Paiute suncup | Camissonia scapoidea (Nutt. ex Torr. & Gray) Raven ssp. scapoidea | CASCS3 | Onagraceae | |
| Pajaro manzanita | Arctostaphylos pajaroensis (J.E. Adams ex McMinn) J.E. Adams | ARPA3 | Ericaceae | |
| pak choi | Brassica chinensis L. | BRCH4 | Brassicaceae | |
| Palay rubbervine | Cryptostegia grandiflora (Roxb. ex R. Br.) R. Br. | CRGR6 | Asclepiadaceae | |
| pale agoseris | Agoseris glauca (Pursh) Raf. | AGGL | Asteraceae | |
| pale agoseris | Agoseris glauca (Pursh) Raf. var. agrestis (Osterhout) Q. Jones ex Cronq. | AGGLA | Asteraceae | |
| pale agoseris | Agoseris glauca (Pursh) Raf. var. cronquistii Welsh | AGGLC | Asteraceae | |
| pale agoseris | Agoseris glauca (Pursh) Raf. var. dasycephala (Torr. & Gray) Jepson | AGGLD | Asteraceae | |
| pale agoseris | Agoseris glauca (Pursh) Raf. var. glauca | AGGLG | Asteraceae | |
| pale agoseris | Agoseris glauca (Pursh) Raf. var. monticola (Greene) Q. Jones ex Cronq. | AGGLM | Asteraceae | |
| pale bastard toadflax | Comandra umbellata (L.) Nutt. ssp. pallida (A. DC.) Piehl | COUMP | Santalaceae | |
| pale bellflower | Campanula scouleri Hook. ex A. DC. | CASC7 | Campanulaceae | |
| pale biddy-biddy | Acaena pallida (Kirk) Allen | ACPA14 | Rosaceae | |
| pale botrychium | Botrychium pallidum W.H. Wagner | BOPA12 | Ophioglossaceae | |
| pale bugseed | Corispermum pallidum Mosyakin | COPA39 | Chenopodiaceae | |
| pale callicostella moss | Callicostella pallida (Hornsch.) Ĺngstr. | CAPA67 | Callicostaceae | |
| pale cologania | Cologania pallida Rose | COPA4 | Fabaceae | |
| pale five eyes | Chamaesaracha pallida Averett | CHPA16 | Solanaceae | |
| pale giant hyssop | Agastache pallida (Lindl.) Cory | AGPA11 | Lamiaceae | |
| pale grasspink | Calopogon pallidus Chapman | CAPA4 | Orchidaceae | |
| pale Indian paintbrush | Castilleja pallescens (Gray) Greenm. | CAPA25 | Scrophulariaceae | |
| pale Indian paintbrush | Castilleja pallescens (Gray) Greenm. var. inverta (A. Nels. & J.F. Macbr.) Edwin | CAPAI | Scrophulariaceae | |
| pale Indian paintbrush | Castilleja pallescens (Gray) Greenm. var. pallescens | CAPAP7 | Scrophulariaceae | |
| pale Indian plaintain | Arnoglossum atriplicifolium (L.) H.E. Robins. | ARAT | Asteraceae | |
| pale leather flower | Clematis versicolor Small ex Rydb. | CLVE | Ranunculaceae | |
| pale lidflower | Calyptranthes pallens Griseb. | CAPA8 | Myrtaceae | |
| pale madwort | Alyssum alyssoides (L.) L. | ALAL3 | Brassicaceae | |
| pale Mexican pricklypoppy | Argemone ochroleuca Sweet | AROC2 | Papaveraceae | |
| pale seagrape | Coccoloba pallida C. Wright | COPA24 | Polygonaceae | |
| pale sedge | Carex pallescens L. | CAPA17 | Cyperaceae | |
| pale serviceberry | Amelanchier pallida Greene | AMPA2 | Rosaceae | |
| pale thistle | Cirsium pallidum Woot. & Standl. | CIPA5 | Asteraceae | |
| pale Wallowa Indian paintbrush | Castilleja oresbia Greenm. | CAOR4 | Scrophulariaceae | |
| paleyellow suncup | Camissonia pallida (Abrams) Raven | CAPA36 | Onagraceae | |
| paleyellow suncup | Camissonia pallida (Abrams) Raven ssp. pallida | CAPAP5 | Onagraceae | |
| Palisot's calymperes moss | Calymperes palisotii Schwaegr. | CAPA68 | Calymperaceae | |
| pallid bird's beak | Cordylanthus tenuis Gray ssp. pallescens (Pennell) Chuang & Heckard | COTEP2 | Scrophulariaceae | |
| pallid flatsedge | Cyperus pallidicolor (Kükenth.) G. Tucker | CYPA24 | Cyperaceae | |
| pallid milkweed | Asclepias cryptoceras S. Wats. | ASCR | Asclepiadaceae | |
| pallid milkweed | Asclepias cryptoceras S. Wats. ssp. cryptoceras | ASCRC2 | Asclepiadaceae | |
| pallid suncup | Camissonia brevipes (Gray) Raven ssp. pallidula (Munz) Raven | CABRP | Onagraceae | |
| palm | Acoelorraphe H. Wendl. | ACOEL | Arecaceae | |
| palm fern | Blechnum appendiculatum Willd. | BLAP | Blechnaceae | |
| palmate toothwort | Cardamine nuttallii Greene var. nuttallii | CANUN2 | Brassicaceae | |
| palmbract bird's-beak | Cordylanthus palmatus (Ferris) J.F. Macbr. | COPA8 | Scrophulariaceae | |
| Palmer ceanothus | Ceanothus palmeri Trel. | CEPA | Rhamnaceae | |
| Palmer evening-primrose | Camissonia palmeri (S. Wats.) Raven | CAPA37 | Onagraceae | |
| Palmer's bluestar | Amsonia palmeri Gray | AMPA5 | Apocynaceae | |
| Palmer's century plant | Agave palmeri Engelm. | AGPA3 | Agavaceae | |
| Palmer's cock's comb | Celosia palmeri S. Wats. | CEPA5 | Amaranthaceae | |
| Palmer's cryptantha | Cryptantha palmeri (Gray) Payson | CRPA21 | Boraginaceae | |
| Palmer's goosefoot | Chenopodium neomexicanum Standl. var. palmeri (Standl.) T.W. Walters | CHNEP | Chenopodiaceae | |
| Palmer's Indian mallow | Abutilon palmeri Gray | ABPA | Malvaceae | |
| Palmer's leather flower | Clematis palmeri Rose | CLPA | Ranunculaceae | |
| Palmer's mariposa lily | Calochortus palmeri S. Wats. | CAPA3 | Liliaceae | |
| Palmer's mariposa lily | Calochortus palmeri S. Wats. var. palmeri | CAPAP4 | Liliaceae | |
| Palmer's milkvetch | Astragalus palmeri Gray | ASPA10 | Fabaceae | |
| Palmer's spineflower | Chorizanthe palmeri S. Wats. | CHPA8 | Polygonaceae | |
| Palmer's spleenwort | Asplenium palmeri Maxon | ASPA | Aspleniaceae | |
| palm-grass | Curculigo capitulata (Lour.) Kuntze | CUCA3 | Liliaceae | |
| palm-leaf marshmallow | Althaea cannabina L. | ALCA25 | Malvaceae | |
| palmleaf poppymallow | Callirhoe pedata (Nutt. ex Hook.) Gray | CAPE23 | Malvaceae | |
| palmleaf thoroughwort | Conoclinium greggii (Gray) Small | COGR10 | Asteraceae | |
| palmtree cyanea | Cyanea arborea Hbd. | CYAR10 | Campanulaceae | |
| palmyra palm | Borassus aethiopum C. Martius | BOAE | Arecaceae | |
| Palo Alto thistle | Cirsium praeteriens J.F. Macbr. | CIPR2 | Asteraceae | |
| palo blanco | Allophylus crassinervis Radlk. | ALCR9 | Sapindaceae | |
| palo de caja | Allophylus racemosus Sw. | ALRA | Sapindaceae | |
| palo de gallina | Alchorneopsis floribunda (Benth.) Muell.-Arg. | ALFL3 | Euphorbiaceae | |
| palo de ramon | Banara Aubl. | BANAR | Flacourtiaceae | |
| palo iloron | Antirhea lucida (Sw.) Hook. f. | ANLU3 | Rubiaceae | |
| Palolo Valley cyrtandra | Cyrtandra gracilis Hbd. ex C.B. Clarke | CYGR4 | Gesneriaceae | |
| Palolo Valley rollandia | Cyanea koolauensis Lammers, Givnish & Sytsma | CYKO4 | Campanulaceae | |
| Palouse milkvetch | Astragalus arrectus Gray | ASAR7 | Fabaceae | |
| Palouse thistle | Cirsium brevifolium Nutt. | CIBR | Asteraceae | |
| Pammell's dotted lichen | Bacidia pammellii (Fink) Zahlbr. | BAPA5 | Bacidiaceae | |
| pamohe | Asplenium unilaterale Lam. | ASUN | Aspleniaceae | |
| pampano | Calathea lutea (Aubl.) Schult. | CALU11 | Marantaceae | |
| pampas grass | Cortaderia araucana Stapf | COAR16 | Poaceae | |
| pampas grass | Cortaderia Stapf | CORTA | Poaceae | |
| panal | Cypselea humifusa Turp. | CYHU3 | Aizoaceae | |
| Panaluu Mountain rollandia | Cyanea purpurellifolia (Rock) Lammers, Givnish & Systma | CYPU11 | Campanulaceae | |
| Panama hat plant | Carludovica palmata Ruiz & Pavón | CAPA65 | Cyclanthaceae | |
| Panama rubbertree | Castilla elastica Sessé | CAEL5 | Moraceae | |
| Panamint cryptantha | Cryptantha angustifolia (Torr.) Greene | CRAN4 | Boraginaceae | |
| Panamint milkvetch | Astragalus panamintensis Sheldon | ASPA11 | Fabaceae | |
| Panamint Mountain mariposa lily | Calochortus panamintensis (Ownbey) Reveal | CAPA45 | Liliaceae | |
| Panamint rock goldenrod | Chrysothamnus gramineus Hall | CHGR13 | Asteraceae | |
| Panamint springparsley | Cymopterus panamintensis Coult. & Rose | CYPA | Apiaceae | |
| Panamint springparsley | Cymopterus panamintensis Coult. & Rose var. acutifolius (Coult. & Rose) Munz | CYPAA | Apiaceae | |
| Panamint springparsley | Cymopterus panamintensis Coult. & Rose var. panamintensis | CYPAP | Apiaceae | |
| panicled false indigo | Amorpha paniculata Torr. & Gray | AMPA4 | Fabaceae | |
| pannicle jointvetch | Aeschynomene paniculata Willd. ex Vogel | AEPA3 | Fabaceae | |
| panther milkvetch | Astragalus pardalinus (Rydb.) Barneby | ASPA12 | Fabaceae | |
| papala | Charpentiera Gaud. | CHARP | Amaranthaceae | |
| papaya | Carica L. | CARIC | Caricaceae | |
| papaya | Carica papaya L. | CAPA23 | Caricaceae | |
| paper birch | Betula papyrifera Marsh. | BEPA | Betulaceae | |
| paper birch | Betula papyrifera Marsh. var. papyrifera | BEPAP | Betulaceae | |
| paper mulberry | Broussonetia papyrifera (L.) L'Hér. ex Vent. | BRPA4 | Moraceae | |
| paperbark maple | Acer griseum (Franch.) Pax | ACGR14 | Aceraceae | |
| paperbark-thorn | Acacia sieberiana DC. var. woodii (Burtt Davy) Keay & Brenan | ACSIW2 | Fabaceae | |
| paperflower | Bougainvillea glabra Choisy | BOGL4 | Nyctaginaceae | |
| papery cyanea | Cyanea membranacea Rock | CYME9 | Campanulaceae | |
| papery onion | Allium membranaceum Ownbey | ALME | Liliaceae | |
| pappose tarweed | Centromadia parryi (Greene) Greene ssp. australis (Keck) B.G. Baldwin | CEPAA | Asteraceae | |
| pappose tarweed | Centromadia parryi (Greene) Greene ssp. parryi | CEPAP4 | Asteraceae | |
| pappose tarweed | Centromadia parryi (Greene) Greene ssp. rudis (Greene) B.G. Baldwin | CEPAR4 | Asteraceae | |
| papyrus | Cyperus papyrus L. | CYPA8 | Cyperaceae | |
| parachute plant | Atrichoseris platyphylla (Gray) Gray | ATPL | Asteraceae | |
| parachute sedge | Carex tonsa (Fern.) Bickn. var. rugosperma (Mackenzie) Crins | CATOR | Cyperaceae | |
| paradox acacia | Acacia paradoxa DC. | ACPA8 | Fabaceae | |
| paradox campylopus moss | Campylopus paradoxus Wils. in Hardy | CAPA69 | Dicranaceae | |
| Paradox milkvetch | Astragalus holmgreniorum Barneby | ASHO5 | Fabaceae | |
| Paraguayan starburr | Acanthospermum australe (Loefl.) Kuntze | ACAU2 | Asteraceae | |
| Paraguayan windmill grass | Chloris canterai Arech. | CHCA6 | Poaceae | |
| Paraguayan windmill grass | Chloris canterai Arech. var. canterai | CHCAC5 | Poaceae | |
| Paraguayan windmill grass | Chloris canterai Arech. var. grandiflora (Roseng. & Izag.) D.E. Anderson | CHCAG3 | Poaceae | |
| paralejo de monte | Banisteriopsis lucida (L.C. Rich.) Small | BALU3 | Malpighiaceae | |
| parana pine | Araucaria angustifolia (Bertol.) Kuntze | ARAN15 | Araucariaceae | |
| parasite cup lichen | Cladonia parasitica (Hoffm.) Hoffm. | CLPA13 | Cladoniaceae | |
| parasol sedge | Carex umbellata Schkuhr ex Willd. | CAUM4 | Cyperaceae | |
| pareira | Chondrodendron tomentosum Ruiz & Pavón | CHTO5 | Menispermaceae | |
| pareira brava | Cissampelos pareira L. | CIPA4 | Menispermaceae | |
| Parish's chaenactis | Chaenactis parishii Gray | CHPA | Asteraceae | |
| Parish's flatsedge | Cyperus parishii Britt. | CYPA4 | Cyperaceae | |
| Parish's glasswort | Arthrocnemum subterminale (Parish) Standl. | ARSU11 | Chenopodiaceae | |
| Parish's Indian mallow | Abutilon parishii S. Wats. | ABPA2 | Malvaceae | |
| Parish's milkvetch | Astragalus douglasii (Torr. & Gray) Gray var. parishii (Gray) M.E. Jones | ASDOP | Fabaceae | |
| Parish's needlegrass | Achnatherum parishii (Vasey) Barkworth | ACPA13 | Poaceae | |
| Parish's needlegrass | Achnatherum parishii (Vasey) Barkworth var. parishii | ACPAP | Poaceae | |
| Parish's onion | Allium parishii S. Wats. | ALPA2 | Liliaceae | |
| Parish's saltbush | Atriplex parishii S. Wats. | ATPA2 | Chenopodiaceae | |
| Parish's sandmat | Chamaesyce parishii (Greene) Millsp. ex Parish | CHPA30 | Euphorbiaceae | |
| Parish's threeawn | Aristida purpurea Nutt. var. parishii (A.S. Hitchc.) Allred | ARPUP5 | Poaceae | |
| Parish's woolly milkweed | Asclepias vestita Hook. & Arn. ssp. parishii (Jepson) Woods. | ASVEP | Asclepiadaceae | |
| park milkvetch | Astragalus leptaleus Gray | ASLE9 | Fabaceae | |
| park rockcress | Arabis fernaldiana Rollins | ARFE2 | Brassicaceae | |
| park rockcress | Arabis fernaldiana Rollins var. fernaldiana | ARFEF2 | Brassicaceae | |
| park rockcress | Arabis fernaldiana Rollins var. stylosa (S. Wats.) Rollins | ARFES2 | Brassicaceae | |
| Parks' croton | Croton parksii Croizat | CRPA5 | Euphorbiaceae | |
| Parlin's pussytoes | Antennaria parlinii Fern. | ANPA9 | Asteraceae | |
| Parlin's pussytoes | Antennaria parlinii Fern. ssp. fallax (Greene) Bayer & Stebbins | ANPAF | Asteraceae | |
| Parlin's pussytoes | Antennaria parlinii Fern. ssp. parlinii | ANPAP | Asteraceae | |
| parlor palm | Chamaedorea elegans C. Martius | CHEL5 | Arecaceae | |
| parmelia abrothallus lichen | Abrothallus parmeliarum (Sommerf.) Arnold | ABPA5 | Uncertain Lichen Family | |
| parrotfeather treefern | Cyathea andina (Karst.) Domin | CYAN | Cyatheaceae | |
| parrothead Indian paintbrush | Castilleja pilosa (S. Wats.) Rydb. | CAPI3 | Scrophulariaceae | |
| parrothead Indian paintbrush | Castilleja pilosa (S. Wats.) Rydb. var. pilosa | CAPIP | Scrophulariaceae | |
| parrot-lily | Alstroemeria pulchella L. f. | ALPU2 | Liliaceae | |
| parrotweed | Bocconia frutescens L. | BOFR2 | Papaveraceae | |
| Parry ceanothus | Ceanothus parryi Trel. | CEPA3 | Rhamnaceae | |
| Parry manzanita | Arctostaphylos parryana Lemmon | ARPA4 | Ericaceae | |
| Parry manzanita | Arctostaphylos parryana Lemmon ssp. deserticum J.E. Keeley, L. Boykin & A. Massihi | ARPAD2 | Ericaceae | |
| Parry manzanita | Arctostaphylos parryana Lemmon ssp. parryana | ARPAP5 | Ericaceae | |
| Parry manzanita | Arctostaphylos parryana Lemmon ssp. tumescens J.E. Keeley, L. Boykin & A. Massihi | ARPAT | Ericaceae | |
| Parry's agave | Agave parryi Engelm. | AGPA4 | Agavaceae | |
| Parry's agave | Agave parryi Engelm. ssp. neomexicana (Woot. & Standl.) Ullrich | AGPAN6 | Agavaceae | |
| Parry's agave | Agave parryi Engelm. ssp. parryi | AGPAP5 | Agavaceae | |
| Parry's arnica | Arnica parryi Gray | ARPA13 | Asteraceae | |
| Parry's arnica | Arnica parryi Gray ssp. parryi | ARPAP3 | Asteraceae | |
| Parry's bellflower | Campanula parryi Gray | CAPA10 | Campanulaceae | |
| Parry's bellflower | Campanula parryi Gray var. parryi | CAPAP2 | Campanulaceae | |
| Parry's blue eyed Mary | Collinsia parryi Gray | COPA2 | Scrophulariaceae | |
| Parry's false tarplant | Centromadia parryi (Greene) Greene | CEPA21 | Asteraceae | |
| Parry's fringed onion | Allium parryi S. Wats. | ALPA11 | Liliaceae | |
| Parry's grama | Bouteloua parryi (Fourn.) Griffiths | BOPA2 | Poaceae | |
| Parry's leastdaisy | Chaetopappa parryi Gray | CHPA2 | Asteraceae | |
| Parry's lipfern | Cheilanthes parryi (D.C. Eat.) Domin | CHPA4 | Pteridaceae | |
| Parry's milkvetch | Astragalus parryi Gray | ASPA13 | Fabaceae | |
| Parry's pussypaws | Cistanthe parryi (Gray) Hershkovitz | CIPA7 | Portulacaceae | |
| Parry's pussypaws | Cistanthe parryi (Gray) Hershkovitz var. parryi | CIPAP | Portulacaceae | |
| Parry's saltbush | Atriplex parryi S. Wats. | ATPA3 | Chenopodiaceae | |
| Parry's sandmat | Chamaesyce parryi (Engelm.) Rydb. | CHPA28 | Euphorbiaceae | |
| Parry's sedge | Carex parryana Dewey | CAPA18 | Cyperaceae | |
| Parry's sedge | Carex parryana Dewey var. brevisquama F.J. Herm. | CAPAB | Cyperaceae | |
| Parry's sedge | Carex parryana Dewey var. parryana | CAPAP3 | Cyperaceae | |
| Parry's thistle | Cirsium parryi (Gray) Petrak | CIPA | Asteraceae | |
| Parry's thistle | Cirsium parryi (Gray) Petrak ssp. parryi | CIPAP2 | Asteraceae | |
| Parry's wormwood | Artemisia parryi Gray | ARPA17 | Asteraceae | |
| parsley hawthorn | Crataegus marshallii Egglest. | CRMA5 | Rosaceae | |
| parsley piert | Aphanes L. | APHAN4 | Rosaceae | |
| parsley spleenwort | Asplenium cristatum Lam. | ASCR6 | Aspleniaceae | |
| particular cracked lichen | Acarospora particularis H. Magn. | ACPA7 | Acarosporaceae | |
| partridge pea | Chamaecrista fasciculata (Michx.) Greene | CHFA2 | Fabaceae | |
| partridge pea | Chamaecrista fasciculata (Michx.) Greene var. fasciculata | CHFAF | Fabaceae | |
| partridge pea | Chamaecrista fasciculata (Michx.) Greene var. macrosperma (Fern.) C.F. Reed | CHFAM2 | Fabaceae | |
| Passey's onion | Allium passeyi N.& A. Holmgren | ALPA5 | Liliaceae | |
| pasto micael | Axonopus micay Garcia-Barr. | AXMI | Poaceae | |
| pasture hawksbeard | Crepis pannonica (Jacq.) K. Koch | CRPA20 | Asteraceae | |
| pasture knapweed | Centaurea bovina Velen. | CEBO | Asteraceae | |
| pasture thistle | Cirsium pumilum Spreng. | CIPU4 | Asteraceae | |
| pastureweed | Cyathula prostrata (L.) Blume | CYPR10 | Amaranthaceae | |
| Patterson's milkvetch | Astragalus pattersonii Gray ex Brandeg. | ASPA14 | Fabaceae | |
| Patterson's wormwood | Artemisia pattersonii Gray | ARPA18 | Asteraceae | |
| pauper milkvetch | Astragalus misellus S. Wats. | ASMI8 | Fabaceae | |
| pauper milkvetch | Astragalus misellus S. Wats. var. misellus | ASMIM3 | Fabaceae | |
| pauper milkvetch | Astragalus misellus S. Wats. var. pauper Barneby | ASMIP | Fabaceae | |
| pawpaw | Asimina Adans. | ASIMI | Annonaceae | |
| pawpaw | Asimina triloba (L.) Dunal | ASTR | Annonaceae | |
| Payson's cryptantha | Cryptantha paysonii (J.F. Macbr.) I.M. Johnston | CRPA8 | Boraginaceae | |
| Payson's milkvetch | Astragalus paysonii (Rydb.) Barneby | ASPA16 | Fabaceae | |
| Payson's sedge | Carex paysonis Clokey | CAPA31 | Cyperaceae | |
| Payson's wild cabbage | Caulanthus simulans Payson | CASI5 | Brassicaceae | |
| peach palm | Bactris gasipaes Kunth | BAGA2 | Arecaceae | |
| Peach Springs canyon cholla | Cylindropuntia abysii (Hester) Backeberg | CYAB2 | Cactaceae | |
| peachleaf bellflower | Campanula persicifolia L. | CAPE20 | Campanulaceae | |
| peanut | Arachis hypogaea L. | ARHY | Fabaceae | |
| peanut | Arachis L. | ARACH | Fabaceae | |
| peanut | Arachis monticola Krapov. & Rig. | ARMO9 | Fabaceae | |
| pear hawthorn | Crataegus calpodendron (Ehrh.) Medik. | CRCA | Rosaceae | |
| pearl laceleaf | Anthurium scandens (Aubl.) Engl. | ANSC4 | Araceae | |
| pearl wattle | Acacia podalyriifolia A. Cunningham ex G. Don | ACPO2 | Fabaceae | |
| pearly everlasting | Anaphalis DC. | ANAPH | Asteraceae | |
| pearly pussytoes | Antennaria anaphaloides Rydb. | ANAN2 | Asteraceae | |
| Pearson's hawthorn | Crataegus pearsonii Ashe | CRPE13 | Rosaceae | |
| pearthorn | Crataegus perjucunda Sarg. | CRPE7 | Rosaceae | |
| peashrub | Caragana Fabr. | CARAG | Fabaceae | |
| peashrub | Caragana korshinskii Kom. | CAKO6 | Fabaceae | |
| pebble pincushion | Chaenactis carphoclinia Gray | CHCA | Asteraceae | |
| pebble pincushion | Chaenactis carphoclinia Gray var. carphoclinia | CHCAC | Asteraceae | |
| pecan | Carya illinoinensis (Wangenh.) K. Koch | CAIL2 | Juglandaceae | |
| Pecho manzanita | Arctostaphylos pechoensis (Dudley ex Abrams) Dudley ex Munz | ARPE5 | Ericaceae | |
| Peck's Indian paintbrush | Castilleja peckiana Pennell | CAPE19 | Scrophulariaceae | |
| Peck's milkvetch | Astragalus peckii Piper | ASPE4 | Fabaceae | |
| Peck's sedge | Carex peckii Howe | CAPE11 | Cyperaceae | |
| peculiar moonwort | Botrychium paradoxum W.H. Wagner | BOPA9 | Ophioglossaceae | |
| Peebles' bluestar | Amsonia peeblesii Woods. | AMPE | Apocynaceae | |
| Peebles' browneyes | Camissonia claviformis (Torr. & Frém.) Raven ssp. peeblesii (Munz) Raven | CACLP2 | Onagraceae | |
| pegwood | Antirhea coriacea (Vahl) Urban | ANCO3 | Rubiaceae | |
| Peirson's browneyes | Camissonia claviformis (Torr. & Frém.) Raven ssp. peirsonii (Munz) Raven | CACLP3 | Onagraceae | |
| Peirson's false bindweed | Calystegia peirsonii (Abrams) Brummitt | CAPE18 | Convolvulaceae | |
| Peirson's milkvetch | Astragalus magdalenae Greene var. peirsonii (Munz & McBurney) Barneby | ASMAP | Fabaceae | |
| Peirson's pincushion | Chaenactis carphoclinia Gray var. peirsonii (Jepson) Munz | CHCAP2 | Asteraceae | |
| Peirson's springbeauty | Claytonia lanceolata Pall. ex Pursh var. peirsonii Munz & Johnston | CLLAP2 | Portulacaceae | |
| Peking cotoneaster | Cotoneaster acutifolius Turcz. | COAC2 | Rosaceae | |
| pele clermontia | Clermontia peleana Rock | CLPE2 | Campanulaceae | |
| pele clermontia | Clermontia peleana Rock var. peleana | CLPEP4 | Campanulaceae | |
| pelicanflower | Aristolochia grandiflora Sw. | ARGR2 | Aristolochiaceae | |
| pelos del diablo | Aristida portoricensis Pilger | ARPO3 | Poaceae | |
| pelotazo | Abutilon incanum (Link) Sweet | ABIN | Malvaceae | |
| peltate dutchman's pipe | Aristolochia peltata L. | ARPE7 | Aristolochiaceae | |
| pendant kihifern | Adenophorus periens Bishop | ADPE2 | Grammitidaceae | |
| pendantgrass | Arctophila fulva (Trin.) Rupr. ex Anderss. | ARFU2 | Poaceae | |
| pendantgrass | Arctophila Rupr. ex Anderss. | ARCTO2 | Poaceae | |
| pendulous barbella moss | Barbella pendula (Sull.) Fleisch. | BAPE6 | Meteoriaceae | |
| Peninsular manzanita | Arctostaphylos peninsularis P.V. Wells | ARPE9 | Ericaceae | |
| penisula onion | Allium peninsulare J.G. Lemmon ex Greene var. peninsulare | ALPEP2 | Liliaceae | |
| Pennell's bird's beak | Cordylanthus tenuis Gray ssp. capillaris (Pennell) Chuang & Heckard | COTEC | Scrophulariaceae | |
| Pennsylvania bittercress | Cardamine pensylvanica Muhl. ex Willd. | CAPE3 | Brassicaceae | |
| Pennsylvania hawthorn | Crataegus pennsylvanica Ashe | CRPE3 | Rosaceae | |
| Pennsylvania sedge | Carex pensylvanica Lam. | CAPE6 | Cyperaceae | |
| Pensacola hawthorn | Crataegus lacrimata Small | CRLA2 | Rosaceae | |
| pepper | Capsicum L. | CAPSI | Solanaceae | |
| pepperbush | Croton humilis L. | CRHU | Euphorbiaceae | |
| peppervine | Ampelopsis arborea (L.) Koehne | AMAR5 | Vitaceae | |
| peppervine | Ampelopsis Michx. | AMPEL3 | Vitaceae | |
| pequi | Caryocar brasiliense Cambess. | CABR36 | Caryocaraceae | |
| peregrine saltbush | Atriplex suberecta I. Verd. | ATSU80 | Chenopodiaceae | |
| peregrine thistle | Cirsium cymosum (Greene) J.T. Howell | CICY | Asteraceae | |
| perennial cornflower | Centaurea montana L. | CEMO | Asteraceae | |
| perennial quakinggrass | Briza media L. | BRME | Poaceae | |
| perennial rockcress | Arabis perennans S. Wats. | ARPE2 | Brassicaceae | |
| perennial sandmat | Chamaesyce perennans Shinners | CHPE10 | Euphorbiaceae | |
| periwinkle | Catharanthus G. Don | CATHA | Apocynaceae | |
| perplexed chiodecton lichen | Chiodecton perplexum Nyl. | CHPE11 | Opegraphaceae | |
| Perry's aloe | Aloe perryi Baker | ALPE9 | Aloaceae | |
| Persian goatgrass | Aegilops crassa Boiss. | AECR | Poaceae | |
| Peruvian dodder | Cuscuta obtusiflora Kunth | CUOB | Cuscutaceae | |
| Peruvian dodder | Cuscuta obtusiflora Kunth var. glandulosa Engelm. | CUOBG | Cuscutaceae | |
| Peruvian ragweed | Ambrosia peruviana Willd. | AMPE2 | Asteraceae | |
| Peruvian-lily | Alstroemeria aurea Graham | ALAU6 | Liliaceae | |
| petite flamboyant bauhinia | Bauhinia multinervia (Kunth) DC. | BAMU3 | Fabaceae | |
| phantom orchid | Cephalanthera austiniae (Gray) Heller | CEAU | Orchidaceae | |
| pheasant's eye | Adonis L. | ADONI | Ranunculaceae | |
| Philippine evergreen | Aglaonema commutatum Schott | AGCO4 | Araceae | |
| Philippine evergreen | Aglaonema commutatum Schott var. maculatum (Hook. f.) Nicolson | AGCOM | Araceae | |
| Philippine pigeonwings | Clitoria fairchildiana Howard | CLFA5 | Fabaceae | |
| Philippine violet | Barleria L. | BARLE | Acanthaceae | |
| Phipps' hawthorn | Crataegus phippsii R. O'Kennon | CRPH2 | Rosaceae | |
| Phoenix City hawthorn | Crataegus annosa Beadle | CRAN | Rosaceae | |
| Picabo milkvetch | Astragalus oniciformis Barneby | ASON2 | Fabaceae | |
| pick me nots | Cryptantha texana (A. DC.) Greene | CRTE5 | Boraginaceae | |
| Pickering's reedgrass | Calamagrostis pickeringii Gray | CAPI | Poaceae | |
| piedmont bedstraw | Cruciata pedemontana (Bellardi) Ehrend. | CRPE10 | Rubiaceae | |
| piedmont cup lichen | Cladonia piedmontensis G. Merr. | CLPI3 | Cladoniaceae | |
| Piedmont flatsedge | Cyperus distans L. f. | CYDI7 | Cyperaceae | |
| Piedmont roseling | Callisia rosea (Vent.) D.R. Hunt | CARO18 | Commelinaceae | |
| piedmont threeawn | Aristida condensata Chapman | ARCO7 | Poaceae | |
| pigeonpea | Cajanus cajan (L.) Millsp. | CACA27 | Fabaceae | |
| pigeonwings | Clitoria L. | CLITO | Fabaceae | |
| Pigmy cypress-pine | Callitris oblonga Rich. | CAOB15 | Cupressaceae | |
| pignut hickory | Carya glabra (P. Mill.) Sweet | CAGL8 | Juglandaceae | |
| pig's ear | Cotyledon L. | COTYL | Crassulaceae | |
| pig's ear | Cotyledon orbiculata L. | COOR2 | Crassulaceae | |
| pig's ear | Cotyledon orbiculata L. var. oblongata (Haw.) DC. | COORO | Crassulaceae | |
| pigweed | Amaranthus L. | AMARA | Amaranthaceae | |
| piipiilau manamana | Asplenium lobulatum Mett. | ASLO5 | Aspleniaceae | |
| Pike's horsehair lichen | Bryoria pikei Brodo & D. Hawksw. | BRPI8 | Parmeliaceae | |
| pili nut | Canarium ovatum Engler | CAOV7 | Burseraceae | |
| pillpod sandmat | Chamaesyce hirta (L.) Millsp. | CHHI3 | Euphorbiaceae | |
| pimpernel | Anagallis L. | ANAGA | Primulaceae | |
| pin lichen | Coniocybe Ach. | CONIO3 | Coniocybaceae | |
| pin lichen | Coniocybe gracilescens Willey | COGR15 | Coniocybaceae | |
| pincushion | Chaenactis DC. | CHAEN | Asteraceae | |
| pincushion flower | Chaenactis fremontii Gray | CHFR | Asteraceae | |
| pine barren flatsedge | Cyperus retrorsus Chapman | CYRE5 | Cyperaceae | |
| pine barren flatsedge | Cyperus retrorsus Chapman var. retrorsus | CYRER2 | Cyperaceae | |
| pine barren flatsedge | Cyperus retrorsus Chapman var. robustus (Boeckl.) Kükenth. | CYRER | Cyperaceae | |
| pine barren sandreed | Calamovilfa brevipilis (Torr.) Scribn. | CABR2 | Poaceae | |
| pine barren sedge | Carex turgescens Torr. | CATU4 | Cyperaceae | |
| pine dropseed | Blepharoneuron tricholepis (Torr.) Nash | BLTR | Poaceae | |
| pine flatsedge | Cyperus hypopitys G. Tucker | CYHY6 | Cyperaceae | |
| Pine Hill buckbrush | Ceanothus roderickii Knight | CERO4 | Rhamnaceae | |
| pine hyacinth | Clematis baldwinii Torr. & Gray | CLBA | Ranunculaceae | |
| pine hyacinth | Clematis baldwinii Torr. & Gray var. baldwinii | CLBAB | Ranunculaceae | |
| pine hyacinth | Clematis baldwinii Torr. & Gray var. latiuscula R.W. Long | CLBAL | Ranunculaceae | |
| pine needlegrass | Achnatherum pinetorum (M.E. Jones) Barkworth | ACPI2 | Poaceae | |
| Pine Valley milkvetch | Astragalus straturensis M.E. Jones | ASST5 | Fabaceae | |
| pineapple | Ananas comosus (L.) Merr. | ANCO30 | Bromeliaceae | |
| pineapple | Ananas P. Mill. | ANANA | Bromeliaceae | |
| pineapple cactus | Coryphantha sulcata (Engelm.) Britt. & Rose | COSU7 | Cactaceae | |
| pineapplegrass | Astelia Banks & Soland. ex R. Br. | ASTEL | Liliaceae | |
| pinegrass | Calamagrostis rubescens Buckl. | CARU | Poaceae | |
| pineland butterfly pea | Centrosema arenicola (Small) F.J. Herm. | CEAR5 | Fabaceae | |
| pineland chaffhead | Carphephorus carnosus (Small) C.W. James | CACA59 | Asteraceae | |
| pineland daisy | Chaptalia dentata (L.) Cass. | CHDE4 | Asteraceae | |
| pineland dwarf mistletoe | Arceuthobium vaginatum (Willd.) J. Presl | ARVA | Viscaceae | |
| pineland dwarf mistletoe | Arceuthobium vaginatum (Willd.) J. Presl ssp. cryptopodum (Engelm.) Hawksworth & Wiens | ARVAC | Viscaceae | |
| pineland false foxglove | Agalinis divaricata (Chapman) Pennell | AGDI2 | Scrophulariaceae | |
| pineland fern | Anemia adiantifolia (L.) Sw. | ANAD | Anemiaceae | |
| pineland golden trumpet | Angadenia berteroi (A. DC.) Miers | ANBE2 | Apocynaceae | |
| pineland golden trumpet | Angadenia Miers | ANGAD | Apocynaceae | |
| pineland goldenaster | Chrysopsis latisquamea Pollard | CHLA7 | Asteraceae | |
| pineland hawthorn | Crataegus pinetorum Beadle | CRPI3 | Rosaceae | |
| pineland milkberry | Chiococca parvifolia Wullschl. ex Griseb. | CHPA17 | Rubiaceae | |
| pineland milkweed | Asclepias obovata Ell. | ASOB | Asclepiadaceae | |
| pineland rayless goldenrod | Bigelowia nudata (Michx.) DC. | BINU | Asteraceae | |
| pineland rayless goldenrod | Bigelowia nudata (Michx.) DC. ssp. australis L.C. Anders. | BINUA | Asteraceae | |
| pineland rayless goldenrod | Bigelowia nudata (Michx.) DC. ssp. nudata | BINUN | Asteraceae | |
| pineland threeawn | Aristida stricta Michx. | ARST5 | Poaceae | |
| pineland threeseed mercury | Acalypha ostryifolia Riddell | ACOS | Euphorbiaceae | |
| pineland wattle | Acacia pinetorum F.J. Herm. | ACPI | Fabaceae | |
| pineland wild indigo | Baptisia lecontei Torr. & Gray | BALE4 | Fabaceae | |
| pine-leaf bottlebrush | Callistemon pinifolius (J. C. Wendl.) DC. | CAPI19 | Myrtaceae | |
| pinemat | Ceanothus diversifolius Kellogg | CEDI2 | Rhamnaceae | |
| pinemat manzanita | Arctostaphylos nevadensis Gray | ARNE | Ericaceae | |
| pineneedle milkweed | Asclepias linaria Cav. | ASLI6 | Asclepiadaceae | |
| pinepink | Bletia purpurea (Lam.) DC. | BLPU | Orchidaceae | |
| pinewoods bluestem | Andropogon arctatus Chapman | ANAR2 | Poaceae | |
| pinewoods cryptantha | Cryptantha simulans Greene | CRSI2 | Boraginaceae | |
| pinewoods milkweed | Asclepias humistrata Walt. | ASHU3 | Asclepiadaceae | |
| pinewoods pussytoes | Antennaria geyeri Gray | ANGE3 | Asteraceae | |
| pinguin | Bromelia pinguin L. | BRPI4 | Bromeliaceae | |
| pink funnel lily | Androstephium breviflorum S. Wats. | ANBR4 | Liliaceae | |
| pink queen | Cleome hassleriana Chod. | CLHA | Capparaceae | |
| pink redstem | Ammannia latifolia L. | AMLA3 | Lythraceae | |
| pink sand verbena | Abronia umbellata Lam. | ABUM | Nyctaginaceae | |
| pink sand verbena | Abronia umbellata Lam. ssp. breviflora (Standl.) Munz | ABUMB | Nyctaginaceae | |
| pink sand verbena | Abronia umbellata Lam. ssp. umbellata | ABUMU | Nyctaginaceae | |
| pink shower | Cassia grandis L. f. | CAGR11 | Fabaceae | |
| pink spineflower | Chorizanthe membranacea Benth. | CHME2 | Polygonaceae | |
| pink tickseed | Coreopsis rosea Nutt. | CORO | Asteraceae | |
| pink turtlehead | Chelone lyonii Pursh | CHLY2 | Scrophulariaceae | |
| pinkbracted manzanita | Arctostaphylos pringlei Parry ssp. drupacea (Parry) P.V. Wells | ARPRD2 | Ericaceae | |
| pinkfairies | Clarkia pulchella Pursh | CLPU | Onagraceae | |
| pinkflower bindweed | Convolvulus erubescens Sims | COER9 | Convolvulaceae | |
| pinkfringe | Arthrostemma ciliatum Pavón ex D. Don | ARCI2 | Melastomataceae | |
| pinto peanut | Arachis pintoi Krapov. & W. C. Greg. | ARPI8 | Fabaceae | |
| pintwater rabbitbrush | Chrysothamnus eremobius L.C. Anders. | CHER3 | Asteraceae | |
| Pinyon Desert cryptantha | Cryptantha scoparia A. Nels. | CRSC2 | Boraginaceae | |
| pinyon dwarf mistletoe | Arceuthobium divaricatum Engelm. | ARDI3 | Viscaceae | |
| pinyon gilia | Aliciella subacaulis (Rydb.) J.M. Porter & L.A. Johnson | ALSU10 | Polemoniaceae | |
| pinyon goosefoot | Chenopodium atrovirens Rydb. | CHAT | Chenopodiaceae | |
| pinyon milkvetch | Astragalus pinonis M.E. Jones | ASPI4 | Fabaceae | |
| pinyon milkvetch | Astragalus pinonis M.E. Jones var. pinonis | ASPIP4 | Fabaceae | |
| pinyon rockcress | Arabis dispar M.E. Jones | ARDI | Brassicaceae | |
| pioneer rockcress | Arabis platysperma Gray | ARPL | Brassicaceae | |
| pioneer rockcress | Arabis platysperma Gray var. platysperma | ARPLP2 | Brassicaceae | |
| Piper's anemone | Anemone piperi Britt. ex Rydb. | ANPI | Ranunculaceae | |
| Piper's buxbaumia moss | Buxbaumia piperi Best | BUPI | Buxbaumiaceae | |
| Piper's hawthorn | Crataegus chrysocarpa Ashe var. piperi (Britt.) Kruschke | CRCHP2 | Rosaceae | |
| Piper's sedge | Carex piperi Mackenzie | CAPI6 | Cyperaceae | |
| pipestem clematis | Clematis lasiantha Nutt. | CLLA3 | Ranunculaceae | |
| pipevine | Aristolochia macrophylla Lam. | ARMA7 | Aristolochiaceae | |
| pipsissewa | Chimaphila umbellata (L.) W. Bart. | CHUM | Pyrolaceae | |
| pipsissewa | Chimaphila umbellata (L.) W. Bart. ssp. acuta (Rydb.) Hultén | CHUMA | Pyrolaceae | |
| pipsissewa | Chimaphila umbellata (L.) W. Bart. ssp. cisatlantica (Blake) Hultén | CHUMC2 | Pyrolaceae | |
| pipsissewa | Chimaphila umbellata (L.) W. Bart. ssp. occidentalis (Rydb.) Hultén | CHUMO2 | Pyrolaceae | |
| piratebush | Buckleya distichophylla (Nutt.) Torr. | BUDI | Santalaceae | |
| Pismo clarki | Clarkia speciosa H.F. & M.E. Lewis ssp. immaculata H.F. & M.E. Lewis | CLSPI | Onagraceae | |
| pitseed goosefoot | Chenopodium berlandieri Moq. | CHBE4 | Chenopodiaceae | |
| pitseed goosefoot | Chenopodium berlandieri Moq. var. berlandieri | CHBEB2 | Chenopodiaceae | |
| pitseed goosefoot | Chenopodium berlandieri Moq. var. boscianum (Moq.) H.A. Wahl | CHBEB | Chenopodiaceae | |
| pitseed goosefoot | Chenopodium berlandieri Moq. var. macrocalycium (Aellen) Cronq. | CHBEM | Chenopodiaceae | |
| pitseed goosefoot | Chenopodium berlandieri Moq. var. sinuatum (J. Murr) H.A. Wahl | CHBES | Chenopodiaceae | |
| pitted beardgrass | Bothriochloa pertusa (L.) A. Camus | BOPE2 | Poaceae | |
| pitted lichen | Cavernularia Degel. | CAVER2 | Parmeliaceae | |
| pitted lichen | Cavernularia lophyrea (Ach.) Degel. | CALO60 | Parmeliaceae | |
| pitted onion | Allium lacunosum S. Wats. | ALLA3 | Liliaceae | |
| pitted onion | Allium lacunosum S. Wats. var. davisiae (M.E. Jones) McNeal & Ownbey | ALLAD | Liliaceae | |
| pitted onion | Allium lacunosum S. Wats. var. lacunosum | ALLAL | Liliaceae | |
| pitted onion | Allium lacunosum S. Wats. var. micranthum Eastw. | ALLAM2 | Liliaceae | |
| Pittsburgh hawthorn | Crataegus porrecta Ashe | CRPO11 | Rosaceae | |
| placa chiquitu | Antirhea acutata (DC.) Urban | ANAC4 | Rubiaceae | |
| plain mariposa lily | Calochortus invenustus Greene | CAIN3 | Liliaceae | |
| plains dozedaisy | Aphanostephus ramosissimus DC. | APRA | Asteraceae | |
| plains dozedaisy | Aphanostephus ramosissimus DC. var. humilis (Benth.) B.L. Turner & Birdsong | APRAH | Asteraceae | |
| plains dozedaisy | Aphanostephus ramosissimus DC. var. ramosissimus | APRAR | Asteraceae | |
| plains evening-primrose | Camissonia contorta (Dougl. ex Lehm.) Kearney | CACO34 | Onagraceae | |
| plains flatsedge | Cyperus onerosus M.C. Johnston | CYON | Cyperaceae | |
| plains milkvetch | Astragalus gilviflorus Sheldon | ASGI5 | Fabaceae | |
| plains milkvetch | Astragalus gilviflorus Sheldon var. gilviflorus | ASGIG | Fabaceae | |
| plains milkvetch | Astragalus gilviflorus Sheldon var. purpureus Dorn | ASGIP | Fabaceae | |
| plains milkweed | Asclepias pumila (Gray) Vail | ASPU | Asclepiadaceae | |
| plains onion | Allium perdulce S.V. Fraser | ALPE2 | Liliaceae | |
| plains onion | Allium perdulce S.V. Fraser var. perdulce | ALPEP | Liliaceae | |
| plains reedgrass | Calamagrostis montanensis Scribn. ex Vasey | CAMO | Poaceae | |
| plains sandparsley | Ammoselinum popei Torr. & Gray | AMPO4 | Apiaceae | |
| plains springparsley | Cymopterus acaulis (Pursh) Raf. | CYAC | Apiaceae | |
| plains springparsley | Cymopterus acaulis (Pursh) Raf. var. acaulis | CYACA | Apiaceae | |
| plains springparsley | Cymopterus acaulis (Pursh) Raf. var. parvus Goodrich | CYACP | Apiaceae | |
| plantainleaf sedge | Carex plantaginea Lam. | CAPL4 | Cyperaceae | |
| plateau delissea | Cyanea rivularis Rock | CYRI4 | Campanulaceae | |
| plateau false foxglove | Agalinis edwardsiana Pennell | AGED | Scrophulariaceae | |
| plateau milkvetch | Astragalus serpens M.E. Jones | ASSE6 | Fabaceae | |
| plateau silverbush | Argythamnia simulans Ingram | ARSI2 | Euphorbiaceae | |
| Platte River milkvetch | Astragalus plattensis Nutt. | ASPL2 | Fabaceae | |
| Plukenet's flatsedge | Cyperus plukenetii Fern. | CYPL3 | Cyperaceae | |
| plumed brickellbush | Brickellia brachyphylla (Gray) Gray | BRBR2 | Asteraceae | |
| plumeless thistle | Carduus L. | CARDU | Asteraceae | |
| plumeweed | Carminatia tenuiflora DC. | CATE8 | Asteraceae | |
| Plumier's bromelia | Bromelia plumieri (E. Morr.) L.B. Sm. | BRPL3 | Bromeliaceae | |
| plumleaf hawthorn | Crataegus persimilis Sarg. | CRPE6 | Rosaceae | |
| Plummer's baccharis | Baccharis plummerae Gray | BAPL | Asteraceae | |
| Plummer's baccharis | Baccharis plummerae Gray ssp. plummerae | BAPLP | Asteraceae | |
| Plummer's mariposa lily | Calochortus plummerae Greene | CAPL2 | Liliaceae | |
| PMC manzanita | Arctostaphylos ×repens (J.T. Howell) P.V. Wells [glandulosa × virgata] | ARRE8 | Ericaceae | |
| pochote | Ceiba acuminata (S. Watson) Rose | CEAC4 | Bombacaceae | |
| pochote | Ceiba aesculifolia (Kunth) Britt. & E.G. Baker | CEAE2 | Bombacaceae | |
| pod mahogany | Afzelia quanzensis Welw. | AFQU | Fabaceae | |
| Poelt's athelia lichen | Athelia poeltii Julich | ATPO5 | Atheliaceae | |
| pohaku cyanea | Cyanea pohaku Lammers | CYPO5 | Campanulaceae | |
| Pohil's milkvetch | Astragalus lentiginosus Dougl. ex Hook. var. pohlii Welsh & Barneby | ASLEP5 | Fabaceae | |
| Point Reyes bentgrass | Agrostis clivicola Crampton var. punta-reyesensis Crampton | AGCLP | Poaceae | |
| Point Reyes ceanothus | Ceanothus gloriosus J.T. Howell | CEGL | Rhamnaceae | |
| Point Reyes ceanothus | Ceanothus gloriosus J.T. Howell var. exaltatus J.T. Howell | CEGLE | Rhamnaceae | |
| Point Reyes ceanothus | Ceanothus gloriosus J.T. Howell var. gloriosus | CEGLG3 | Rhamnaceae | |
| pointed cryptantha | Cryptantha muricata (Hook. & Arn.) A. Nels. & J.F. Macbr. | CRMU2 | Boraginaceae | |
| pointed sandmat | Chamaesyce acuta Millsp. | CHAC2 | Euphorbiaceae | |
| pointedtip mariposa lily | Calochortus apiculatus Baker | CAAP | Liliaceae | |
| pointleaf manzanita | Arctostaphylos pungens Kunth | ARPU5 | Ericaceae | |
| Poiret's copperleaf | Acalypha poiretii Spreng. | ACPO | Euphorbiaceae | |
| poison angelica | Angelica lineariloba Gray | ANLI2 | Apiaceae | |
| poison ash | Comocladia dodonaea (L.) Urban | CODO | Anacardiaceae | |
| poison hemlock | Conium L. | CONIU | Apiaceae | |
| poison hemlock | Conium maculatum L. | COMA2 | Apiaceae | |
| poisonbulb | Crinum asiaticum L. | CRAS6 | Liliaceae | |
| poke milkweed | Asclepias exaltata L. | ASEX | Asclepiadaceae | |
| polar milkvetch | Astragalus polaris Benth. | ASPO | Fabaceae | |
| polar sedge | Carex arctiformis Mackenzie | CAAR14 | Cyperaceae | |
| polargrass | Arctagrostis Griseb. | ARCTA | Poaceae | |
| pole butterflybush | Buddleja officinalis Maxim. | BUOF | Buddlejaceae | |
| polished maidenhair | Adiantum concinnum Humb. & Bonpl. ex Willd. | ADCO | Pteridaceae | |
| Pollin's orange lichen | Caloplaca pollinii (A. Massal.) Jatta | CAPO15 | Teloschistaceae | |
| polymorph bamboo | Bambusa polymorpha Munro | BAPO6 | Poaceae | |
| Pomona milkvetch | Astragalus pomonensis M.E. Jones | ASPO2 | Fabaceae | |
| pond apple | Annona glabra L. | ANGL4 | Annonaceae | |
| pond flatsedge | Cyperus ochraceus Vahl | CYOC2 | Cyperaceae | |
| pond water-starwort | Callitriche stagnalis Scop. | CAST | Callitrichaceae | |
| po'ola | Claoxylon sandwicense Muell.-Arg. | CLSA | Euphorbiaceae | |
| poorland flatsedge | Cyperus compressus L. | CYCO | Cyperaceae | |
| poorman's weatherglass | Anagallis arvensis L. ssp. foemina (P. Mill.) Schinz & Thellung | ANARF | Primulaceae | |
| pop saltbush | Atriplex holocarpa F. Muell. | ATHO2 | Chenopodiaceae | |
| pop saltbush | Atriplex spongiosa F. Muell. | ATSP4 | Chenopodiaceae | |
| popolo | Cyanea solanacea Hbd. | CYSO | Campanulaceae | |
| poponax | Acacia tortuosa (L.) Willd. | ACTO | Fabaceae | |
| poppymallow | Callirhoe Nutt. | CALLI3 | Malvaceae | |
| porcupine flower | Barleria prionitis L. | BAPR | Acanthaceae | |
| porcupine jointvetch | Aeschynomene histrix Poir. | AEHI2 | Fabaceae | |
| porcupine jointvetch | Aeschynomene histrix Poir. var. incana (Vogel) Benth. | AEHII | Fabaceae | |
| Porcupine River thimbleweed | Anemone multiceps (Greene) Standl. | ANMU4 | Ranunculaceae | |
| porcupine thistle | Cirsium laterifolium (Osterhout) Petrak | CILA5 | Asteraceae | |
| poreleaf dogweed | Adenophyllum porophyllum (Cav.) Hemsl. | ADPO2 | Asteraceae | |
| porknut | Acacia macracantha Humb. & Bonpl. ex Willd. | ACMA | Fabaceae | |
| Port Clarence Indian paintbrush | Castilleja caudata (Pennell) Rebr. | CACA20 | Scrophulariaceae | |
| Port Clarence Indian paintbrush | Castilleja caudata (Pennell) Rebr. var. auricoma (Pennell) Hultén | CACAA | Scrophulariaceae | |
| Port Clarence Indian paintbrush | Castilleja caudata (Pennell) Rebr. var. caudata | CACAC11 | Scrophulariaceae | |
| Port Huron hawthorn | Crataegus glareosa Ashe | CRGL4 | Rosaceae | |
| Port Orford cedar | Chamaecyparis lawsoniana (A. Murr.) Parl. | CHLA | Cupressaceae | |
| Porter brome | Bromus porteri (Coult.) Nash | BRPO2 | Poaceae | |
| Porter's fringed sedge | Carex crinita Lam. var. porteri (Olney) Fern. | CACRP | Cyperaceae | |
| Porter's reedgrass | Calamagrostis porteri Gray | CAPO3 | Poaceae | |
| Porter's reedgrass | Calamagrostis porteri Gray ssp. insperata (Swallen) C.W. Greene | CAPOI | Poaceae | |
| Porter's reedgrass | Calamagrostis porteri Gray ssp. porteri | CAPOP | Poaceae | |
| Porter's sandmat | Chamaesyce porteriana Small | CHPO7 | Euphorbiaceae | |
| Porter's sandmat | Chamaesyce porteriana Small var. porteriana | CHPOP3 | Euphorbiaceae | |
| Porter's sandmat | Chamaesyce porteriana Small var. scoparia (Small) Burch | CHPOS | Euphorbiaceae | |
| Porter's sandwort | Arenaria fendleri Gray var. porteri Rydb. | ARFEP | Caryophyllaceae | |
| Porter's wormwood | Artemisia porteri Cronq. | ARPO5 | Asteraceae | |
| pot marigold | Calendula officinalis L. | CAOF | Asteraceae | |
| poverty brome | Bromus sterilis L. | BRST2 | Poaceae | |
| poverty threeawn | Aristida divaricata Humb. & Bonpl. ex Willd. | ARDI5 | Poaceae | |
| powdery false cloak fern | Argyrochosma dealbata (Pursh) Windham | ARDE5 | Pteridaceae | |
| powdery milkvetch | Astragalus cerussatus Sheldon | ASCE2 | Fabaceae | |
| powdery strap airplant | Catopsis berteroniana (J.A. & J.H. Schultes) Mez | CABE5 | Bromeliaceae | |
| Powell's amaranth | Amaranthus powellii S. Wats. | AMPO2 | Amaranthaceae | |
| Powell's amaranth | Amaranthus powellii S. Wats. ssp. powellii | AMPOP | Amaranthaceae | |
| Powell's saltweed | Atriplex powellii S. Wats. | ATPO2 | Chenopodiaceae | |
| prairie acacia | Acacia angustissima (P. Mill.) Kuntze | ACAN | Fabaceae | |
| prairie acacia | Acacia angustissima (P. Mill.) Kuntze var. hirta (Nutt.) B.L. Robins. | ACANH | Fabaceae | |
| prairie acacia | Acacia angustissima (P. Mill.) Kuntze var. suffrutescens (Rose) Isely | ACANS2 | Fabaceae | |
| prairie bishop | Bifora americana Benth. & Hook. f. ex S. Wats. | BIAM2 | Apiaceae | |
| prairie broomweed | Amphiachyris dracunculoides (DC.) Nutt. | AMDR | Asteraceae | |
| prairie camas | Camassia angusta (Engelm. & Gray) Blank. | CAAN2 | Liliaceae | |
| prairie dodder | Cuscuta plattensis A. Nels. | CUPL | Cuscutaceae | |
| prairie false foxglove | Agalinis heterophylla (Nutt.) Small ex Britt. | AGHE4 | Scrophulariaceae | |
| prairie false willow | Baccharis texana (Torr. & Gray) Gray | BATE | Asteraceae | |
| prairie hawthorn | Crataegus pratensis Sarg. | CRPR4 | Rosaceae | |
| prairie Indian paintbrush | Castilleja purpurea (Nutt.) G. Don var. citrina (Pennell) Shinners | CAPUC | Scrophulariaceae | |
| prairie lily | Cooperia pedunculata Herbert | COPE | Liliaceae | |
| prairie milkvetch | Astragalus laxmannii Jacq. var. robustior (Hook.) Barneby & Welsh | ASLAR | Fabaceae | |
| prairie milkweed | Asclepias sullivantii Engelm. ex Gray | ASSU3 | Asclepiadaceae | |
| prairie sagewort | Artemisia frigida Willd. | ARFR4 | Asteraceae | |
| prairie sandmat | Chamaesyce missurica (Raf.) Shinners | CHMI8 | Euphorbiaceae | |
| prairie sandreed | Calamovilfa longifolia (Hook.) Scribn. | CALO | Poaceae | |
| prairie sandreed | Calamovilfa longifolia (Hook.) Scribn. var. longifolia | CALOL2 | Poaceae | |
| prairie sandreed | Calamovilfa longifolia (Hook.) Scribn. var. magna Scribn. & Merr. | CALOM | Poaceae | |
| prairie sedge | Carex prairea Dewey ex Wood | CAPR6 | Cyperaceae | |
| prairie straw sedge | Carex suberecta (Olney) Britt. | CASU5 | Cyperaceae | |
| prairie tea | Croton monanthogynus Michx. | CRMO6 | Euphorbiaceae | |
| prairie thistle | Cirsium canescens Nutt. | CICA11 | Asteraceae | |
| prairie threeawn | Aristida oligantha Michx. | AROL | Poaceae | |
| prairie wattle | Acacia angustissima (P. Mill.) Kuntze var. texensis (Torr. & Gray) Isely | ACANT4 | Fabaceae | |
| precocious milkvetch | Astragalus proimanthus Barneby | ASPR7 | Fabaceae | |
| Presidio clarkia | Clarkia franciscana Lewis & Raven | CLFR3 | Onagraceae | |
| Presidio manzanita | Arctostaphylos hookeri G. Don ssp. ravenii P.V. Wells | ARHOR2 | Ericaceae | |
| Presl's sedge | Carex preslii Steud. | CAPR8 | Cyperaceae | |
| pretty afzelia | Afzelia bella Harms | AFBE | Fabaceae | |
| pretty sedge | Carex woodii Dewey | CAWO2 | Cyperaceae | |
| Preuss' milkvetch | Astragalus preussii Gray | ASPR6 | Fabaceae | |
| Preuss' milkvetch | Astragalus preussii Gray var. laxiflorus Gray | ASPRL2 | Fabaceae | |
| Preuss' milkvetch | Astragalus preussii Gray var. preussii | ASPRP3 | Fabaceae | |
| prickbush | Adolphia Meisn. | ADOLP | Rhamnaceae | |
| pricklegrass | Crypsis Ait. | CRYPS | Poaceae | |
| prickly bog sedge | Carex atlantica Bailey | CAAT4 | Cyperaceae | |
| prickly bog sedge | Carex atlantica Bailey ssp. atlantica | CAATA2 | Cyperaceae | |
| prickly bog sedge | Carex atlantica Bailey ssp. capillacea (Bailey) Reznicek | CAATC | Cyperaceae | |
| prickly bottlebrush | Callistemon brachyandrus Lindl. | CABR38 | Myrtaceae | |
| prickly cryptantha | Cryptantha echinella Greene | CREC | Boraginaceae | |
| prickly cyanea | Cyanea horrida (Rock) O. Deg. & Hosaka | CYHO6 | Campanulaceae | |
| prickly gousblom | Berkheya heterophylla O. Hoffmann | BEHE | Asteraceae | |
| prickly hornwort | Ceratophyllum muricatum Cham. | CEMU3 | Ceratophyllaceae | |
| prickly hornwort | Ceratophyllum muricatum Cham. ssp. australe (Griseb.) D.H. Les | CEMUA | Ceratophyllaceae | |
| prickly hound's tongue | Cynoglossum glochidiatum Wallich ex Benth. | CYGL8 | Boraginaceae | |
| prickly Moses | Acacia verticillata (L'Hér.) Willd. | ACVE2 | Fabaceae | |
| prickly sandwort | Arenaria aculeata S. Wats. | ARAC2 | Caryophyllaceae | |
| prickly sedge | Carex spicata Huds. | CASP10 | Cyperaceae | |
| prickly spiderflower | Cleome aculeata L. | CLAC4 | Capparaceae | |
| prickly spineflower | Chorizanthe rectispina Goodman | CHRE | Polygonaceae | |
| pricklypoppy | Argemone L. | ARGEM | Papaveraceae | |
| pricklyseed pygmyweed | Crassula viridis (S. Wats.) Bywater & Wickens | CRVI6 | Crassulaceae | |
| pride-of-Barbados | Caesalpinia pulcherrima (L.) Sw. | CAPU13 | Fabaceae | |
| Priest Valley spineflower | Chorizanthe ventricosa Goodman | CHVE3 | Polygonaceae | |
| primroseleaf horseweed | Conyza primulifolia (Lam.) Cuatrec. & Lourteig | COPR5 | Asteraceae | |
| Prince-of-Wales feather | Amaranthus hypochondriacus L. | AMHY2 | Amaranthaceae | |
| prince's pine | Chimaphila Pursh | CHIMA | Pyrolaceae | |
| Pringle manzanita | Arctostaphylos pringlei Parry | ARPR | Ericaceae | |
| Pringle manzanita | Arctostaphylos pringlei Parry ssp. pringlei | ARPRP | Ericaceae | |
| Pringle's amaranth | Amaranthus pringlei S. Wats. | AMPR | Amaranthaceae | |
| Pringle's bird's beak | Cordylanthus pringlei Gray | COPR | Scrophulariaceae | |
| Pringle's brickellbush | Brickellia pringlei Gray | BRPR | Asteraceae | |
| Pringle's giant hyssop | Agastache pringlei (Briq.) Lint & Epling | AGPR3 | Lamiaceae | |
| Pringle's giant hyssop | Agastache pringlei (Briq.) Lint & Epling var. verticillata (Woot. & Standl.) R.W. Sanders | AGPRV | Lamiaceae | |
| Pringle's goosefoot | Chenopodium fremontii S. Wats. var. pringlei (Standl.) Aellen | CHFRP | Chenopodiaceae | |
| Pringle's hawthorn | Crataegus pringlei Sarg. | CRPR | Rosaceae | |
| Pringle's lipfern | Cheilanthes pringlei Davenport | CHPR2 | Pteridaceae | |
| Pringle's swallow-wort | Cynanchum pringlei (Gray) Henrickson | CYPR11 | Asclepiadaceae | |
| prism bouchea | Bouchea prismatica (L.) Kuntze | BOPR | Verbenaceae | |
| propeller flower | Alophia drummondii (Graham) R.C. Foster | ALDR2 | Iridaceae | |
| prostrate ceanothus | Ceanothus prostratus Benth. | CEPR | Rhamnaceae | |
| prostrate chamomile | Anthemis secundiramea Biv. | ANSE6 | Asteraceae | |
| prostrate clarkia | Clarkia prostrata H.F. & M.E. Lewis | CLPR | Onagraceae | |
| prostrate cup lichen | Cladonia prostrata A. Evans | CLPR3 | Cladoniaceae | |
| prostrate marshwort | Apium prostratum Labill. | APPR2 | Apiaceae | |
| prostrate milkvetch | Astragalus miser Dougl. var. decumbens (Nutt. ex Torr. & Gray) Cronq. | ASMID | Fabaceae | |
| prostrate milkweed | Asclepias prostrata Blackwell | ASPR9 | Asclepiadaceae | |
| prostrate pigweed | Amaranthus albus L. | AMAL | Amaranthaceae | |
| prostrate sandmat | Chamaesyce prostrata (Ait.) Small | CHPR6 | Euphorbiaceae | |
| prostrate spineflower | Chorizanthe procumbens Nutt. | CHPR4 | Polygonaceae | |
| Providence Mountain milkvetch | Astragalus nutans M.E. Jones | ASNU3 | Fabaceae | |
| prune-fruit sedge | Carex corrugata Fern. | CACO22 | Cyperaceae | |
| Pt. Reyes bird's-beak | Cordylanthus maritimus Nutt. ex Benth. ssp. palustris (Behr) Chuang & Heckard | COMAP | Scrophulariaceae | |
| pua kala | Cyanea solenocalyx Hbd. | CYSO2 | Campanulaceae | |
| pua'akuhinia | Astelia menziesiana Sm. | ASME4 | Liliaceae | |
| puakauhi | Canavalia hawaiiensis O.& I. Deg. & Sauer | CAHA12 | Fabaceae | |
| pubescent Lemmon's needlegrass | Achnatherum lemmonii (Vasey) Barkworth var. pubescens (Crampton) Barkworth | ACLEP | Poaceae | |
| pubescent mirrorplant | Coprosma pubens Gray | COPU8 | Rubiaceae | |
| pubescent sedge | Carex hirtifolia Mackenzie | CAHI5 | Cyperaceae | |
| pubescent western needlegrass | Achnatherum occidentale (Thurb.) Barkworth ssp. pubescens (Vasey) Barkworth | ACOCP | Poaceae | |
| puckhout | Coccoloba microstachya Willd. | COMI | Polygonaceae | |
| Puerto Rico alsophila | Alsophila portoricensis (Spreng. ex Kuhn) Conant | ALPO7 | Cyatheaceae | |
| Puerto Rico box | Buxus portoricensis Alain | BUPO | Buxaceae | |
| Puerto Rico copperleaf | Acalypha portoricensis Muell.-Arg. | ACPO4 | Euphorbiaceae | |
| Puerto Rico creepingfern | Bolbitis portoricensis (Spreng.) Hennipman | BOPO | Dryopteridaceae | |
| Puerto Rico croton | Croton impressus Urban | CRIM3 | Euphorbiaceae | |
| Puerto Rico flowering fern | Anemia portoricensis Maxon | ANPO2 | Anemiaceae | |
| Puerto Rico helmet orchid | Cranichis ricartii Ackerman | CRRI4 | Orchidaceae | |
| Puerto Rico jointvetch | Aeschynomene gracilis Vogel | AEGR | Fabaceae | |
| Puerto Rico lidflower | Calyptranthes portoricensis Britt. | CAPO9 | Myrtaceae | |
| Puerto Rico maidenhair | Adiantum vivesii Proctor | ADVI4 | Pteridaceae | |
| Puerto Rico manac | Calyptronoma rivalis (O.F. Cook) Bailey | CARI3 | Arecaceae | |
| Puerto Rico manjack | Cordia rupicola Urban | CORU5 | Boraginaceae | |
| Puerto Rico mountainbay | Calyptranthes acevedoi Alain | CAAC4 | Myrtaceae | |
| Puerto Rico palo de gallina | Alchorneopsis portoricensis Urban | ALPO | Euphorbiaceae | |
| Puerto Rico palo de ramon | Banara portoricensis Krug & Urban | BAPO | Flacourtiaceae | |
| Puerto Rico quina | Antirhea portoricensis (Britt. & P. Wilson) Standl. | ANPO3 | Rubiaceae | |
| Puerto Rico raintree | Brunfelsia portoricensis Krug & Urban | BRPO3 | Solanaceae | |
| Puerto Rico ridgerunner | Cybianthus sintenisii (Urban) G. Agostini | CYSI | Myrsinaceae | |
| Puerto Rico sensitive pea | Chamaecrista portoricensis (Urban) O.F. Cook & Collins | CHPO8 | Fabaceae | |
| Puerto Rico silver palm | Coccothrinax barbadensis (Lodd. ex Mart.) Becc. | COBA3 | Arecaceae | |
| Puerto Rico swallow-wort | Cynanchum ephedroides (Griseb.) Alain | CYEP | Asclepiadaceae | |
| Puerto Rico thoroughwort | Critonia portoricensis (Urban) Britt. & P. Wilson | CRPO7 | Asteraceae | |
| Puiggar's calopadia lichen | Calopadia puiggarii (Mull. Arg.) Vezda | CAPU34 | Ectolechiaceae | |
| pulvinate pussytoes | Antennaria rosea Greene ssp. pulvinata (Greene) Bayer | ANROP | Asteraceae | |
| Pumpelly's brome | Bromus inermis Leyss. ssp. pumpellianus (Scribn.) Wagnon | BRINP | Poaceae | |
| Pumpelly's brome | Bromus inermis Leyss. ssp. pumpellianus (Scribn.) Wagnon var. arcticus (Shear ex Scribn. & Merr.) Wagnon | BRINA | Poaceae | |
| Pumpelly's brome | Bromus inermis Leyss. ssp. pumpellianus (Scribn.) Wagnon var. pumpellianus (Scribn.) C.L. Hitchc. | BRINP5 | Poaceae | |
| pumpkin | Cucurbita mixta Pang. | CUMI3 | Cucurbitaceae | |
| pumpwood | Cecropia Loefl. | CECRO | Cecropiaceae | |
| pumpwood | Cecropia schreberiana Miq. | CESC9 | Cecropiaceae | |
| puna cyanea | Cyanea platyphylla (Gray) Hbd. | CYPL7 | Campanulaceae | |
| Punaluu cyanea | Cyanea truncata (Rock) Rock | CYTR7 | Campanulaceae | |
| pungent brickellbush | Brickellia arguta B.L. Robins. | BRAR2 | Asteraceae | |
| pungent brickellbush | Brickellia arguta B.L. Robins. var. arguta | BRARA | Asteraceae | |
| pungent brickellbush | Brickellia arguta B.L. Robins. var. odontolepis B.L. Robins. | BRARO | Asteraceae | |
| pungent false tarplant | Centromadia pungens (Hook. & Arn.) Greene | CEPU14 | Asteraceae | |
| puntaj jayuya | Chione seminervis Urban & Ekman | CHSE5 | Rubiaceae | |
| puntingpole bamboo | Bambusa tuldoides Munro | BATU2 | Poaceae | |
| Purdy's fringed onion | Allium fimbriatum S. Wats. var. purdyi (Eastw.) Ownbey & Aase | ALFIP2 | Liliaceae | |
| purging croton | Croton tiglium L. | CRTI3 | Euphorbiaceae | |
| purple allamanda | Allamanda blanchetii A. DC. | ALBL | Apocynaceae | |
| purple amaranth | Amaranthus blitum L. | AMBL2 | Amaranthaceae | |
| purple amaranth | Amaranthus blitum L. var. blitum | AMBLB | Amaranthaceae | |
| purple amole | Chlorogalum purpureum Brandeg. | CHPU2 | Liliaceae | |
| purple amole | Chlorogalum purpureum Brandeg. var. purpureum | CHPUP2 | Liliaceae | |
| purple beautyberry | Callicarpa dichotoma (Lour.) K. Koch | CADI | Verbenaceae | |
| purple bird's-beak | Cordylanthus parviflorus (Ferris) Wiggins | COPA9 | Scrophulariaceae | |
| purple bittercress | Cardamine purpurea Cham. & Schlecht. | CAPU5 | Brassicaceae | |
| purple bluestem | Andropogon glaucopsis Ell. | ANGL10 | Poaceae | |
| purple cestrum | Cestrum elegans (Brongn. ex Neumann) Schltdl. | CEEL4 | Solanaceae | |
| purple Chinese houses | Collinsia heterophylla Buist ex Graham | COHE | Scrophulariaceae | |
| purple Chinese houses | Collinsia heterophylla Buist ex Graham var. austromontana (Newsom) Munz | COHEA | Scrophulariaceae | |
| purple Chinese houses | Collinsia heterophylla Buist ex Graham var. heterophylla | COHEH | Scrophulariaceae | |
| purple cyanea | Cyanea macrostegia Hbd. | CYMA10 | Campanulaceae | |
| purple cyanea | Cyanea macrostegia Hbd. ssp. macrostegia | CYMAM | Campanulaceae | |
| purple fairy-lantern | Calochortus amoenus Greene | CAAM5 | Liliaceae | |
| purple false brome | Brachypodium distachyon (L.) Beauv. | BRDI2 | Poaceae | |
| purple false foxglove | Agalinis purpurea (L.) Pennell | AGPU5 | Scrophulariaceae | |
| purple false gilyflower | Allophyllum divaricatum (Nutt.) A.& V. Grant | ALDI4 | Polemoniaceae | |
| purple gaymallow | Batesimalva violacea (Rose) Fryxell | BAVI5 | Malvaceae | |
| purple giant hyssop | Agastache scrophulariifolia (Willd.) Kuntze | AGSC | Lamiaceae | |
| purple grama | Bouteloua radicosa (Fourn.) Griffiths | BORA | Poaceae | |
| purple marshlocks | Comarum palustre L. | COPA28 | Rosaceae | |
| purple milkvetch | Astragalus agrestis Dougl. ex G. Don | ASAG2 | Fabaceae | |
| purple milkweed | Asclepias purpurascens L. | ASPU2 | Asclepiadaceae | |
| purple pampas grass | Cortaderia jubata (Lem.) Stapf | COJU2 | Poaceae | |
| purple poppymallow | Callirhoe involucrata (Torr. & Gray) Gray | CAIN2 | Malvaceae | |
| purple poppymallow | Callirhoe involucrata (Torr. & Gray) Gray var. involucrata | CAINI4 | Malvaceae | |
| purple poppymallow | Callirhoe involucrata (Torr. & Gray) Gray var. lineariloba (Torr. & Gray) Gray | CAINL | Malvaceae | |
| purple reedgrass | Calamagrostis purpurascens R. Br. | CAPU | Poaceae | |
| purple reedgrass | Calamagrostis purpurascens R. Br. var. purpurascens | CAPUP7 | Poaceae | |
| purple sand verbena | Abronia angustifolia Greene | ABAN | Nyctaginaceae | |
| purple sedge | Carex purpurifera Mackenzie | CAPU12 | Cyperaceae | |
| purple silkyscale | Anthaenantia rufa (Nutt.) J.A. Schultes | ANRU | Poaceae | |
| purple smallreed | Calamagrostis canescens (Weber ex F. H. Wigg.) Roth | CACA80 | Poaceae | |
| purple spiderling | Boerhavia purpurascens Gray | BOPU | Nyctaginaceae | |
| purple springparsley | Cymopterus purpureus S. Wats. | CYPU2 | Apiaceae | |
| purple stickpea | Calliandra purpurea (L.) Benth. | CAPU33 | Fabaceae | |
| purple threeawn | Aristida purpurea Nutt. | ARPU9 | Poaceae | |
| purple threeawn | Aristida purpurea Nutt. var. perplexa Allred & Valdés-Reyna | ARPUP9 | Poaceae | |
| purple threeawn | Aristida purpurea Nutt. var. purpurea | ARPUP6 | Poaceae | |
| purple wormwood | Artemisia globularia Cham. ex Bess. | ARGL8 | Asteraceae | |
| purpledisk honeycombhead | Balduina atropurpurea Harper | BAAT | Asteraceae | |
| purplenerve springparsley | Cymopterus multinervatus (Coult. & Rose) Tidestrom | CYMU2 | Apiaceae | |
| purple-spot parrot-lily | Alstroemeria haemantha Ruiz & Pavón | ALHA2 | Liliaceae | |
| purplestem angelica | Angelica atropurpurea L. | ANAT | Apiaceae | |
| purplestem beggarticks | Bidens connata Muhl. ex Willd. | BICO5 | Asteraceae | |
| Purpus' carpetgrass | Axonopus purpusii (Mez) Chase | AXPU | Poaceae | |
| Pursh's rattlebox | Crotalaria purshii DC. | CRPU5 | Fabaceae | |
| pussypaws | Cistanthe Spach | CISTA | Portulacaceae | |
| pussytoes | Antennaria Gaertn. | ANTEN | Asteraceae | |
| pussytoes eggyolk lichen | Candelariella antennaria Rasanen | CAAN24 | Candelariaceae | |
| pussywillow jessamine | Cestrum salicifolium Jacq. | CESA4 | Solanaceae | |
| pygmy bamboo | Arundinaria pygmaea (Miq.) Asch. & Graebn. | ARPY8 | Poaceae | |
| pygmy bentspur orchid | Campylocentrum pygmaeum Cogn. | CAPY4 | Orchidaceae | |
| pygmy bluehearts | Buchnera pusilla Kunth | BUPU | Scrophulariaceae | |
| pygmy cypress | Cupressus goveniana Gord. ssp. pygmaea (Lemmon) Bartel | CUGOP2 | Cupressaceae | |
| pygmy fringetree | Chionanthus pygmaeus Small | CHPY2 | Oleaceae | |
| pygmy manzanita | Arctostaphylos mendocinoensis P.V. Wells | ARME8 | Ericaceae | |
| pygmy pussypaws | Cistanthe pygmaea (Parish ex Rydb.) Hershkovitz | CIPY | Portulacaceae | |
| pygmy pussytoes | Antennaria monocephala DC. | ANMO9 | Asteraceae | |
| pygmy pussytoes | Antennaria monocephala DC. ssp. angustata (Greene) Hultén | ANMOA | Asteraceae | |
| pygmy pussytoes | Antennaria monocephala DC. ssp. monocephala | ANMOM | Asteraceae | |
| pygmy sagebrush | Artemisia pygmaea Gray | ARPY2 | Asteraceae | |
| pygmyflower cryptantha | Cryptantha micromeres (Gray) Greene | CRMI2 | Boraginaceae | |
| pygmyflower rockjasmine | Androsace septentrionalis L. | ANSE4 | Primulaceae | |
| pygmyflower rockjasmine | Androsace septentrionalis L. ssp. glandulosa (Woot. & Standl.) G.T. Robbins | ANSEG2 | Primulaceae | |
| pygmyflower rockjasmine | Androsace septentrionalis L. ssp. puberulenta (Rydb.) G.T. Robbins | ANSEP2 | Primulaceae | |
| pygmyflower rockjasmine | Androsace septentrionalis L. ssp. septentrionalis | ANSES3 | Primulaceae | |
| pygmyflower rockjasmine | Androsace septentrionalis L. ssp. subulifera (Gray) G.T. Robbins | ANSES4 | Primulaceae | |
| pygmyflower rockjasmine | Androsace septentrionalis L. ssp. subumbellata (A. Nels.) G.T. Robbins | ANSES5 | Primulaceae | |
| pygmypoppy | Canbya Parry ex Gray | CANBY | Papaveraceae | |
| pygmyweed | Crassula L. | CRASS | Crassulaceae | |
| pyjama lily | Crinum macowanii Baker | CRMA23 | Liliaceae | |
| pyramid maidenhair | Adiantum pyramidale (L.) Willd. | ADPY | Pteridaceae | |
| Pyrenean sedge | Carex pyrenaica Wahlenb. | CAPY3 | Cyperaceae | |
| Pyrenean sedge | Carex pyrenaica Wahlenb. ssp. micropoda (C.A. Mey.) Hultén | CAPYM | Cyperaceae | |
| Pyrenean sedge | Carex pyrenaica Wahlenb. ssp. pyrenaica | CAPYP | Cyperaceae | |
| Pyrenean thistle | Cirsium pyrenaicum (Jacq.) All. | CIPY2 | Asteraceae | |
| pyrethrum | Chrysanthemum cinerariifolium (Trevir.) Vis. | CHCI5 | Asteraceae | |
| q tips | Bombycilaena californica (Fisch. & C.A. Mey.) Holub var. californica | BOCAC | Asteraceae | |
| q tips | Bombycilaena californica (Fisch. & C.A. Mey.) Holub var. subvestita (Gray) Kartesz, comb. nov. ined. | BOCAS | Asteraceae | |
| quailbush | Atriplex lentiformis (Torr.) S. Wats. ssp. breweri (S. Wats.) Hall & Clements | ATLEB | Chenopodiaceae | |
| quakinggrass | Briza humilis M. Bieb. | BRHU4 | Poaceae | |
| quakinggrass | Briza L. | BRIZA | Poaceae | |
| quartzite rimmed lichen | Aspicilia quartzitica W. A. Weber | ASQU3 | Hymeneliaceae | |
| Quebec hawthorn | Crataegus submollis Sarg. | CRSU2 | Rosaceae | |
| Queen Anne's thistle | Cirsium canum (L.) All. | CICA16 | Asteraceae | |
| queen coralbead | Cocculus orbiculatus (L.) DC. | COOR11 | Menispermaceae | |
| queen palm | Arecastrum romanzoffianum (Cham.) Becc. | ARRO10 | Arecaceae | |
| queen sago | Cycas circinalis L. | CYCI3 | Cycadaceae | |
| queen thistle | Cirsium chellyense Moore & Frankton | CICH2 | Asteraceae | |
| Queensland kauri | Agathis robusta (C. Moore ex F.J. Muell.) F.M. Bailey | AGRO6 | Araucariaceae | |
| Queensland sedge | Cyperus hyalinus Vahl | CYHY7 | Cyperaceae | |
| quill cryptantha | Cryptantha affinis (Gray) Greene | CRAF | Boraginaceae | |
| quill sedge | Carex tenera Dewey | CATE3 | Cyperaceae | |
| quina | Antirhea Comm. ex Juss. | ANTIR | Rubiaceae | |
| quina roja | Antirhea obtusifolia Urban | ANOB2 | Rubiaceae | |
| quince | Chaenomeles ×superba (Frahm) Rehder | CHSU21 | Rosaceae | |
| quince | Cydonia oblonga P. Mill. | CYOB2 | Rosaceae | |
| quinine | Cinchona calisaya Wedd. | CICA17 | Rubiaceae | |
| quinine | Cinchona officinalis L. | CIOF | Rubiaceae | |
| quinine | Cinchona pubescens Vahl | CIPU | Rubiaceae | |
| quinineweed | Centaurium beyrichii (Torr. & Gray ex Torr.) B.L. Robins. | CEBE | Gentianaceae | |
| quinoa | Chenopodium quinoa Willd. | CHQU | Chenopodiaceae | |
| quorn wattle | Acacia quornensis J. M. Black | ACQU2 | Fabaceae |
Source: U. S. Department of Agriculture
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