| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| POSIA | Potentilla simplex Michx. var. argyrisma Fern. | Potentilla simplex | Rosaceae
|
| POSIC | Potentilla simplex Michx. var. calvescens Fern. | Potentilla simplex | Rosaceae
|
| POSIT | Potentilla simplex Michx. var. typica Fern. | Potentilla simplex | Rosaceae
|
| POSI2 | Potentilla simplex Michx. | common cinquefoil | Rosaceae
|
| POSTG | Potentilla stipularis L. var. groenlandica Sorensen | Greenland cinquefoil | Rosaceae
|
| POST4 | Potentilla stipularis L. | stipulated cinquefoil | Rosaceae
|
| POST9 | Potentilla strigosa (Pallas ex Pursh) Pallas ex Tratt. | Potentilla pensylvanica var. pensylvanica | Rosaceae
|
| POSU5 | Potentilla subjuga Rydb. | Colorado cinquefoil | Rosaceae
|
| POSUR | Potentilla subviscosa Greene var. ramulosa (Rydb.) Kearney & Peebles | Navajo cinquefoil | Rosaceae
|
| POSUS | Potentilla subviscosa Greene var. subviscosa | Navajo cinquefoil | Rosaceae
|
| POSU6 | Potentilla subviscosa Greene | Navajo cinquefoil | Rosaceae
|
| POSUP | Potentilla supina L. ssp. paradoxa (Nutt.) Soj�k | Potentilla paradoxa | Rosaceae
|
| POTA | Potentilla tabernaemontani Aschers. | Potentilla neumanniana | Rosaceae
|
| POTHA | Potentilla thurberi Gray var. atrorubens (Rydb.) Kearney & Peebles | scarlet cinquefoil | Rosaceae
|
| POTHS | Potentilla thurberi Gray var. sanguinea (Rydb.) Kearney & Peebles | scarlet cinquefoil | Rosaceae
|
| POTHT | Potentilla thurberi Gray var. thurberi | scarlet cinquefoil | Rosaceae
|
| POTH2 | Potentilla thurberi Gray | scarlet cinquefoil | Rosaceae
|
| POTI | Potentilla tilingii (Regel) Greene | Horkelia tridentata ssp. tridentata | Rosaceae
|
| POTR7 | Potentilla tridentata Ait. | Sibbaldiopsis tridentata | Rosaceae
|
| POTU2 | Potentilla tularensis J.T. Howell | Horkelia tularensis | Rosaceae
|
| POUN2 | Potentilla uniflora Ledeb. | oneflower cinquefoil | Rosaceae
|
| POUS | Potentilla usticapensis Fern. | Potentilla pulchella | Rosaceae
|
| POVA4 | Potentilla vahliana Lehm. | Vahl's cinquefoil | Rosaceae
|
| POVA9 | Potentilla vallicola Greene | Potentilla crinita var. crinita | Rosaceae
|
| POVE5 | Potentilla verna auct. p.p. non L. | Potentilla neumanniana | Rosaceae
|
| POVE3 | Potentilla versicolor Rydb. | Potentilla millefolia var. klamathensis | Rosaceae
|
| POVIP | Potentilla villosa Pallas ex Pursh var. parviflora C.L. Hitchc. | Potentilla villosa | Rosaceae
|
| POVI4 | Potentilla villosa Pallas ex Pursh | villous cinquefoil | Rosaceae
|
| POVI23 | Potentilla villosula auct. non Jurtzev | Potentilla villosa | Rosaceae
|
| POVI6 | Potentilla virgulata A. Nels. | Potentilla rubricaulis | Rosaceae
|
| POVI17 | Potentilla viridescens Rydb. | Potentilla gracilis var. fastigiata | Rosaceae
|
| POVI12 | Potentilla viscidula Rydb. | Potentilla wheeleri | Rosaceae
|
| POWHR | Potentilla wheeleri S. Wats. var. rimicola Munz & Johnston | Potentilla rimicola | Rosaceae
|
| POWH | Potentilla wheeleri S. Wats. | Kern cinquefoil | Rosaceae
|
| POWY | Potentilla wyomingensis A. Nels. | Potentilla ovina var. ovina | Rosaceae
|
| POYU2 | Potentilla yukonensis Hult�n | Argentina anserina | Rosaceae
|
| POTEN | Potentilla L. | cinquefoil | Rosaceae
|
| POAN16 | Poteridium annuum (Nutt. ex Hook.) Spach | Sanguisorba annua | Rosaceae
|
| POOF | Poterium officinale (L.) A. Gray | Sanguisorba officinalis | Rosaceae
|
| POPO11 | Poterium polygamum Waldst. & Kit. | Sanguisorba minor ssp. muricata | Rosaceae
|
| POSA16 | Poterium sanguisorba auct. non L. | Sanguisorba minor ssp. muricata | Rosaceae
|
| POPE18 | Pothomorphe peltata (L.) Miq. | Lepianthes peltata | Piperaceae
|
| POUM2 | Pothomorphe umbellata (L.) Miq. | Lepianthes peltata | Piperaceae
|
| POAU7 | Pothos aurea Lindl. & Andr� | Epipremnum pinnatum | Araceae
|
| POARA5 | Pottia arizonica Wareh. var. arizonica | Arizona pottia moss | Pottiaceae
|
| POARM | Pottia arizonica Wareh. var. mucronulata Wareh. | Arizona pottia moss | Pottiaceae
|
| POAR19 | Pottia arizonica Wareh. | Arizona pottia moss | Pottiaceae
|
| POBR18 | Pottia bryoides (Dicks.) Mitt. | pottia moss | Pottiaceae
|
| POCO37 | Pottia conica (Schwaegr.) F�rnr. ex Par. | Pottia davalliana | Pottiaceae
|
| PODA3 | Pottia davalliana (Sm. in Drake) C. Jens. | Davall's pottia moss | Pottiaceae
|
| POFO8 | Pottia fosbergii Bartr. | Pottia starkeana | Pottiaceae
|
| POHEA | Pottia heimii (Hedw.) Hampe var. arctica Lindb. | Desmatodon heimii var. arctica | Pottiaceae
|
| POHEO | Pottia heimii (Hedw.) Hampe var. obtusifolia (C. M�ll.) Hag. | Desmatodon heimii var. arctica | Pottiaceae
|
| POHE17 | Pottia heimii (Hedw.) Hampe | Desmatodon heimii var. heimii | Pottiaceae
|
| POIN29 | Pottia intermedia (Turn.) F�rnr. | intermediate pottia moss | Pottiaceae
|
| POLA16 | Pottia lanceolata (Hedw.) C. M�ll. | lance pottia moss | Pottiaceae
|
| POLAP3 | Pottia latifolia (Schwaegr. in Schultes) C. M�ll. var. pilifera (Brid.) C. M�ll. | Stegonia pilifera | Pottiaceae
|
| POLA21 | Pottia latifolia (Schwaegr. in Schultes) C. M�ll. | Stegonia latifolia | Pottiaceae
|
| POMI20 | Pottia minutula (Schwaegr.) F�rnr. ex Hampe | Pottia davalliana | Pottiaceae
|
| PONE15 | Pottia nevadensis Card. & Th�r. | Nevada pottia moss | Pottiaceae
|
| POOB7 | Pottia obtusifolia C. M�ll. | Desmatodon heimii var. arctica | Pottiaceae
|
| PORA13 | Pottia randii Kenn. | Desmatodon randii | Pottiaceae
|
| POST10 | Pottia starkeana (Hedw.) C. M�ll. | Starke's pottia moss | Pottiaceae
|
| POTE14 | Pottia texana Wareh. in Grout | Pottia starkeana | Pottiaceae
|
| POTRM2 | Pottia truncata (Hedw.) F�rnr. ex B.S.G. var. major (Web. & Mohr) Bruch & Schimp. in B.S.G. | Pottia intermedia | Pottiaceae
|
| POTR21 | Pottia truncata (Hedw.) F�rnr. ex B.S.G. | truncate pottia moss | Pottiaceae
|
| POTR22 | Pottia truncatula (With.) Buse | Pottia truncata | Pottiaceae
|
| POWI4 | Pottia wilsonii (Hook.) Bruch & Schimp. in B.S.G. | Wilson's pottia moss | Pottiaceae
|
| POTTI | Pottia (Reichenb.) F�rnr. | pottia moss | Pottiaceae
|
| POAU9 | Pouteria auahiensis (Rock) Fosberg | Pouteria sandwicensis | Sapotaceae
|
| POAU10 | Pouteria aurantia (Rock) Fosberg | Pouteria sandwicensis | Sapotaceae
|
| POCA43 | Pouteria caimito (Ruiz & Pavon) Radlk. | abiu | Sapotaceae
|
| POCA23 | Pouteria campechiana (Kunth) Baehni | canistel | Sapotaceae
|
| POCE7 | Pouteria ceresolii (Rock) Fosberg | Pouteria sandwicensis | Sapotaceae
|
| PODIF | Pouteria dictyoneura (Griseb.) Radlk. ssp. fuertesii (Urban) Cronq. | cocuyo | Sapotaceae
|
| PODI5 | Pouteria dictyoneura (Griseb.) Radlk. | cocuyo | Sapotaceae
|
| PODO5 | Pouteria dominigensis (Gaertn. f.) Baehni | jacana | Sapotaceae
|
| POHO4 | Pouteria hotteana (Urban & Ekman) Baehni | redmammee | Sapotaceae
|
| POMA19 | Pouteria mammosa (L.) Cronq. | Pouteria sapota | Sapotaceae
|
| POMU6 | Pouteria multiflora (A. DC.) Eyma | bullytree | Sapotaceae
|
| PORH4 | Pouteria rhynchosperma (Rock) Fosberg | Pouteria sandwicensis | Sapotaceae
|
| POSA11 | Pouteria sandwicensis (Gray) Baehni & O. Deg. | 'ala'a | Sapotaceae
|
| POSA13 | Pouteria sapota (Jacq.) H.E. Moore & Stearn | naseberry | Sapotaceae
|
| POSP7 | Pouteria spathulata (Hbd.) Fosberg | Pouteria sandwicensis | Sapotaceae
|
| POVI21 | Pouteria viridis (Pittier) Cronq. | pouteria | Sapotaceae
|
| POUTE | Pouteria Aubl. | pouteria | Sapotaceae
|
| POOC4 | Pouzolzia occidentalis (Liebm.) Weddell | Coamo River pouzolzsbush | Urticaceae
|
| POZE | Pouzolzia zeylanica (L.) Benn. | graceful pouzolzsbush | Urticaceae
|
| POUZO | Pouzolzia Gaud. | pouzolzia | Urticaceae
|
| PRSU5 | Prasanthus suecicus (Gottsche) Lindb. | | Gymnomitriaceae
|
| PRASA | Prasanthus Lindb. & S. W. Arnell | | Gymnomitriaceae
|
| PRQUH | Preissia quadrata (Scop.) Nees ssp. hyperborea R. M. Schust. | | Marchantiaceae
|
| PRQUQ | Preissia quadrata (Scop.) Nees ssp. quadrata | | Marchantiaceae
|
| PRQU2 | Preissia quadrata (Scop.) Nees | | Marchantiaceae
|
| PREIS | Preissia Corda | | Marchantiaceae
|
| PROB | Premna obtusifolia R. Br. | premna | Verbenaceae
|
| PROD | Premna odorata Blanco | fragrant premna | Verbenaceae
|
| PREMN | Premna L. | premna | Verbenaceae
|
| PREX | Prenanthella exigua (Gray) Rydb. | brightwhite | Asteraceae
|
| PRENA2 | Prenanthella Rydb. | prenanthella | Asteraceae
|
| PRALS | Prenanthes alata (Hook.) D. Dietr. var. sagittata Gray | Prenanthes sagittata | Asteraceae
|