| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PAWA4 | Paronychia wardii Rydb. | Paronychia jamesii | Caryophyllaceae
|
| PAWI3 | Paronychia wilkinsonii S. Wats. | Wilkinson's nailwort | Caryophyllaceae
|
| PARON | Paronychia P. Mill. | nailwort | Caryophyllaceae
|
| PAAL16 | Parosela alopecuroides (Willd.) Rydb. | Dalea leporina | Fabaceae
|
| PAAU4 | Parosela aurea (Nutt. ex Pursh) Britt. | Dalea aurea | Fabaceae
|
| PADO3 | Parosela domingensis (DC.) Millsp. | Dalea carthagenensis var. carthagenensis | Fabaceae
|
| PAEN2 | Parosela enneandra (Nutt.) Britt. | Dalea enneandra | Fabaceae
|
| PAFL8 | Parosela floridana Rydb. | Dalea carthagenensis var. floridana | Fabaceae
|
| PALA20 | Parosela lanata (Spreng.) Britt. | Dalea lanata var. lanata | Fabaceae
|
| PANA4 | Parosela nana (Torr. ex Gray) Heller | Dalea nana var. nana | Fabaceae
|
| PAPE18 | Parrotia persica (DC.) C.A. Mey. | Persian ironwood | Hamamelidaceae
|
| PARRO | Parrotia C. A. Mey. | ironwood | Hamamelidaceae
|
| PAEU2 | Parrya eurycarpa (Gray) Jepson | Anelsonia eurycarpa | Brassicaceae
|
| PANUI | Parrya nudicaulis (L.) Boiss. ssp. interior Hult�n | Parrya nudicaulis | Brassicaceae
|
| PANUS | Parrya nudicaulis (L.) Boiss. ssp. septentrionalis Hult�n | Parrya nudicaulis | Brassicaceae
|
| PANUG | Parrya nudicaulis (L.) Boiss. var. grandiflora Hult�n | Parrya nudicaulis | Brassicaceae
|
| PANUI2 | Parrya nudicaulis (L.) Boiss. var. interior (Hult�n) Boivin | Parrya nudicaulis | Brassicaceae
|
| PANU5 | Parrya nudicaulis (L.) Boiss. | nakedstem wallflower | Brassicaceae
|
| PAPL8 | Parrya platycarpa Rydb., non Hook. f. & T. Thomson | Parrya nudicaulis | Brassicaceae
|
| PARY | Parrya rydbergii Botsch. | Parrya nudicaulis | Brassicaceae
|
| PARRY | Parrya R. Br. | parrya | Brassicaceae
|
| PAFI4 | Parryella filifolia Torr. & Gray ex Gray | common dunebroom | Fabaceae
|
| PARO5 | Parryella rotundata Woot. | Errazurizia rotundata | Fabaceae
|
| PARRY2 | Parryella Torr. & Gray ex Gray | parryella | Fabaceae
|
| PABA4 | Parsonsia balsamona (Cham. & Schlecht.) Standl. | Cuphea carthagenensis | Lythraceae
|
| PALY | Parsonsia lythroides Small | Cuphea aspera | Lythraceae
|
| PAMI12 | Parsonsia micrantha (Kunth) Jennings | Cuphea micrantha | Lythraceae
|
| PAPA31 | Parsonsia parsonsia (L.) Britt. | Cuphea parsonsia | Lythraceae
|
| PAPE9 | Parsonsia petiolata (L.) Rusby | Cuphea viscosissima | Lythraceae
|
| PAPR10 | Parsonsia procumbens (Ortega) Heller | Cuphea procumbens | Lythraceae
|
| PAWR6 | Parsonsia wrightii (Gray) Kearney | Cuphea wrightii | Lythraceae
|
| PAMO2 | Parthenice mollis Gray | annual monsterwort | Asteraceae
|
| PARTH | Parthenice Gray | parthenice | Asteraceae
|
| PAALL | Parthenium alpinum (Nutt.) Torr. & Gray var. ligulatum M.E. Jones | Parthenium ligulatum | Asteraceae
|
| PAALT | Parthenium alpinum (Nutt.) Torr. & Gray var. tetraneuris (Barneby) Rollins | Parthenium tetraneuris | Asteraceae
|
| PAAL6 | Parthenium alpinum (Nutt.) Torr. & Gray | alpine feverfew | Asteraceae
|
| PAAR5 | Parthenium argentatum Gray | guayule | Asteraceae
|
| PAAU7 | Parthenium auriculatum Britt. | Parthenium integrifolium var. auriculatum | Asteraceae
|
| PACOC | Parthenium confertum Gray var. confertum | Gray's feverfew | Asteraceae
|
| PACOD | Parthenium confertum Gray var. divaricatum Rollins | Gray's feverfew | Asteraceae
|
| PACOI | Parthenium confertum Gray var. intermedium Mears, var. nov. ined. | Gray's feverfew | Asteraceae
|
| PACOL | Parthenium confertum Gray var. lyratum (Gray) Rollins | Gray's feverfew | Asteraceae
|
| PACOM | Parthenium confertum Gray var. microcephalum Rollins | Gray's feverfew | Asteraceae
|
| PACO11 | Parthenium confertum Gray | Gray's feverfew | Asteraceae
|
| PAHIA | Parthenium hispidum Raf. var. auriculatum (Britt.) Rollins | Parthenium integrifolium var. auriculatum | Asteraceae
|
| PAHI8 | Parthenium hispidum Raf. | Parthenium integrifolium var. hispidum | Asteraceae
|
| PAHYL | Parthenium hysterophorus L. var. lyratum Gray | Parthenium confertum var. lyratum | Asteraceae
|
| PAHY | Parthenium hysterophorus L. | Santa Maria feverfew | Asteraceae
|
| PAIN2 | Parthenium incanum Kunth | mariola | Asteraceae
|
| PAINA | Parthenium integrifolium L. var. auriculatum (Britt.) Cornelius ex Cronq. | wild quinine | Asteraceae
|
| PAINH | Parthenium integrifolium L. var. henryanum Mears | wild quinine | Asteraceae
|
| PAINH2 | Parthenium integrifolium L. var. hispidum (Raf.) Mears | wild quinine | Asteraceae
|
| PAINI | Parthenium integrifolium L. var. integrifolium | wild quinine | Asteraceae
|
| PAINM | Parthenium integrifolium L. var. mabryanum Mears | wild quinine | Asteraceae
|
| PAIN3 | Parthenium integrifolium L. | wild quinine | Asteraceae
|
| PALI6 | Parthenium ligulatum (M.E. Jones) Barneby | Colorado feverfew | Asteraceae
|
| PALO7 | Parthenium lobatum Buckl. | Parthenium hysterophorus | Asteraceae
|
| PALY2 | Parthenium lyratum (Gray) Gray | Parthenium confertum var. lyratum | Asteraceae
|
| PARA9 | Parthenium radfordii Mears | Parthenium integrifolium var. mabryanum | Asteraceae
|
| PARE7 | Parthenium repens Eggert | Parthenium integrifolium var. hispidum | Asteraceae
|
| PATE12 | Parthenium tetraneuris Barneby | Arkansas River feverfew | Asteraceae
|
| PARTH2 | Parthenium L. | feverfew | Asteraceae
|
| PAHE4 | Parthenocissus heptaphylla (Buckl.) Britt. ex Small | sevenleaf creeper | Vitaceae
|
| PAHI9 | Parthenocissus hirsuta (Pursh) Graebn. | Parthenocissus quinquefolia | Vitaceae
|
| PAIN10 | Parthenocissus inserta (Kerner) Fritsch | Parthenocissus quinquefolia | Vitaceae
|
| PAQUH | Parthenocissus quinquefolia (L.) Planch. var. hirsuta (Pursh) Planch. | Parthenocissus quinquefolia | Vitaceae
|
| PAQUM | Parthenocissus quinquefolia (L.) Planch. var. murorum (Focke) Rehd. | Parthenocissus quinquefolia | Vitaceae
|
| PAQUS | Parthenocissus quinquefolia (L.) Planch. var. saintpaulii (Koehne ex Graebn.) Rehd. | Parthenocissus quinquefolia | Vitaceae
|
| PAQU2 | Parthenocissus quinquefolia (L.) Planch. | Virginia creeper | Vitaceae
|
| PATR6 | Parthenocissus tricuspidata (Sieb. & Zucc.) Planch. | Boston ivy | Vitaceae
|
| PAVI5 | Parthenocissus vitacea (Knerr) A.S. Hitchc. | woodbine | Vitaceae
|
| PARTH3 | Parthenocissus Planch. | creeper | Vitaceae
|
| PACO18 | Parvisedum congdonii (Eastw.) Clausen | Sedella congdonii | Crassulaceae
|
| PALE8 | Parvisedum leiocarpum (H.K. Sharsmith) Clausen | Sedella leiocarpa | Crassulaceae
|
| PAPE8 | Parvisedum pentandrum (H.K. Sharsmith) Clausen | Sedella pentandra | Crassulaceae
|
| PAPU10 | Parvisedum pumilum (Benth.) Clausen | Sedella pumila | Crassulaceae
|
| PAGL9 | Pascalia glauca Ortega | beach creeping oxeye | Asteraceae
|
| PASCA | Pascalia Ortega | Pascalia | Asteraceae
|
| PASM | Pascopyrum smithii (Rydb.) A. L�ve | western wheatgrass | Poaceae
|
| PASCO | Pascopyrum A. L�ve | wheatgrass | Poaceae
|
| PACH16 | Paspalidium chapmanii (Vasey) Davise & Pohl | Chapman's bristlegrass | Poaceae
|
| PADI27 | Paspalidium distans (Trin.) Hughes | spreading panicgrass | Poaceae
|
| PAGEG | Paspalidium geminatum (Forsk.) Stapf var. geminatum | Egyptian panicgrass | Poaceae
|
| PAGEP | Paspalidium geminatum (Forsk.) Stapf var. paludivagum (A.S. Hitchc. & Chase) Gould | Egyptian panicgrass | Poaceae
|
| PAGE2 | Paspalidium geminatum (Forsk.) Stapf | Egyptian panicgrass | Poaceae
|
| PAMA13 | Paspalidium macrospermum Roseng. | Paspalidium philippianum | Poaceae
|
| PAPA25 | Paspalidium paludivagum (A.S. Hitchc. & Chase) Parodi | Paspalidium geminatum var. paludivagum | Poaceae
|
| PAPH2 | Paspalidium philippianum Parodi | Philippine watercrown grass | Poaceae
|
| PARA8 | Paspalidium radiatum Vickery | Paspalidium distans | Poaceae
|
| PASPA | Paspalidium Stapf | watercrown grass | Poaceae
|
| PAAC4 | Paspalum acuminatum Raddi | brook crowngrass | Poaceae
|
| PAAL7 | Paspalum almum Chase | Comb's crowngrass | Poaceae
|
| PAAR6 | Paspalum arundinaceum Poir. | thick ditch crowngrass | Poaceae
|
| PABA10 | Paspalum bakeri Hook. | Baker's crowngrass | Poaceae
|
| PABI8 | Paspalum bicorne Lam. | Digitaria bicornis | Poaceae
|
| PABIP | Paspalum bifidum (Bertol.) Nash var. projectum Fern. | Paspalum bifidum | Poaceae
|
| PABI3 | Paspalum bifidum (Bertol.) Nash | pitchfork crowngrass | Poaceae
|
| PABL | Paspalum blodgettii Chapman | Blodgett's crowngrass | Poaceae
|
| PABO3 | Paspalum boscianum Fluegg� | bull crowngrass | Poaceae
|
| PABU3 | Paspalum bushii Nash | Paspalum setaceum | Poaceae
|
| PACA12 | Paspalum caespitosum Fluegg� | blue crowngrass | Poaceae
|