| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PAER3 | Pachyrhizus erosus (L.) Urban | yam bean | Fabaceae
|
| PATU7 | Pachyrhizus tuberosus (Lam.) Sprengel | ajipo | Fabaceae
|
| PACHY2 | Pachyrhizus L.C. Rich. ex DC. | pachyrhizus | Fabaceae
|
| PAPR7 | Pachysandra procumbens Michx. | Allegheny-spurge | Buxaceae
|
| PATE11 | Pachysandra terminalis Sieb. & Zucc. | Japanese pachysandra | Buxaceae
|
| PACHY3 | Pachysandra Michx. | pachysandra | Buxaceae
|
| PALU7 | Pachystachys lutea Nees | lollipop-plant | Acanthaceae
|
| PASP17 | Pachystachys spicata (Ruiz & Pav�n) Wasshausen | | Acanthaceae
|
| PACHY7 | Pachystachys Nees | pachystachys | Acanthaceae
|
| PAMY2 | Pachystima myrsinites (Pursh) Raf. | | Celastraceae
|
| PACHY8 | Pachystima Raf. | pachystima | Celastraceae
|
| PAAC9 | Packera actinella (Greene) W.A. Weber & A. L�ve | Senecio actinella | Asteraceae
|
| PAAN6 | Packera anonyma (Wood) W.A. Weber & A. L�ve | Small's ragwort | Asteraceae
|
| PAAN7 | Packera antennariifolia (Britt.) W.A. Weber & A. L�ve | shalebarren ragwort | Asteraceae
|
| PAAU3 | Packera aurea (L.) A.& D. L�ve | golden ragwort | Asteraceae
|
| PABE7 | Packera bernardina (Greene) W.A. Weber & A. L�ve | San Bernardino ragwort | Asteraceae
|
| PABOB | Packera bolanderi (Gray) W.A. Weber & A. L�ve var. bolanderi | Bolander's ragwort | Asteraceae
|
| PABOH | Packera bolanderi (Gray) W.A. Weber & A. L�ve var. harfordii (Greenm.) T.M. Barkl., comb. nov. ined. | Harford's ragwort | Asteraceae
|
| PABO6 | Packera bolanderi (Gray) W.A. Weber & A. L�ve | Bolander's ragwort | Asteraceae
|
| PABR11 | Packera breweri (Burtt-Davy) W.A. Weber & A. L�ve | Brewer's ragwort | Asteraceae
|
| PACA15 | Packera cana (Hook.) W.A. Weber & A. L�ve | woolly groundsel | Asteraceae
|
| PACA34 | Packera cardamine (Greene) W.A. Weber & A. L�ve | bittercress ragwort | Asteraceae
|
| PACA35 | Packera castoreus (Welsh) Kartesz, comb. nov. ined. | Beaver Mountain ragwort | Asteraceae
|
| PACL10 | Packera clevelandii (Greene) W.A. Weber & A. L�ve | Cleveland's ragwort | Asteraceae
|
| PACO53 | Packera contermina (Greenm.) T.M. Barkl., comb. nov. ined. | | Asteraceae
|
| PACR5 | Packera crocata (Rydb.) W.A. Weber & A. L�ve | saffron ragwort | Asteraceae
|
| PACY8 | Packera cymbalaria (Pursh) W.A. Weber & A. L�ve | dwarf arctic ragwort | Asteraceae
|
| PACY2 | Packera cymbalarioides (Buek) W.A. Weber & A. L�ve | cleftleaf groundsel | Asteraceae
|
| PACY9 | Packera cynthioides (Greene) W.A. Weber & A. L�ve | White Mountain ragwort | Asteraceae
|
| PADE22 | Packera debilis (Nutt.) W.A. Weber & A. L�ve | weak groundsel | Asteraceae
|
| PADID2 | Packera dimorphophylla (Greene) W.A. Weber & A. L�ve ssp. dimorphophylla | splitleaf groundsel | Asteraceae
|
| PADII3 | Packera dimorphophylla (Greene) W.A. Weber & A. L�ve ssp. intermedia (T.M. Barkl.) W.A. Weber & A. L�ve | Packera dimorphophylla var. intermedia | Asteraceae
|
| PADII4 | Packera dimorphophylla (Greene) W.A. Weber & A. L�ve var. intermedia (T.M. Barkl.) T.M. Barkl., comb. nov. ined. | splitleaf groundsel | Asteraceae
|
| PADIP2 | Packera dimorphophylla (Greene) W.A. Weber & A. L�ve var. paysonii (T.M. Barkl.) T.M. Barkl., comb. nov. ined. | Payson's groundsel | Asteraceae
|
| PADI11 | Packera dimorphophylla (Greene) W.A. Weber & A. L�ve | splitleaf groundsel | Asteraceae
|
| PAEUE | Packera eurycephala (Torr. & Gray ex Gray) W.A. Weber & A. L�ve var. eurycephala | widehead groundsel | Asteraceae
|
| PAEUL | Packera eurycephala (Torr. & Gray ex Gray) W.A. Weber & A. L�ve var. lewisrosei (J.T. Howell) T.M. Barkl., comb. nov. ined | Lewis' groundsel | Asteraceae
|
| PAEU5 | Packera eurycephala (Torr. & Gray ex Gray) W.A. Weber & A. L�ve | widehead groundsel | Asteraceae
|
| PAFE4 | Packera fendleri (Gray) W.A. Weber & A. L�ve | Fendler's ragwort | Asteraceae
|
| PAFE3 | Packera fernaldii (Greenm.) A.& D. L�ve | Packera cymbalaria | Asteraceae
|
| PAFL15 | Packera flettii (Wieg.) W.A. Weber & A. L�ve | Flett's ragwort | Asteraceae
|
| PAFR6 | Packera franciscana (Greene) W.A. Weber & A. L�ve | San Francisco Peaks ragwort | Asteraceae
|
| PAGA5 | Packera ganderi (T.M. Barkl. & Beauchamp) W.A. Weber & A. L�ve | Gander's ragwort | Asteraceae
|
| PAGL17 | Packera glabella (Poir) C. Jeffrey | butterweed | Asteraceae
|
| PAGR9 | Packera greenei (Gray) W.A. Weber & A. L�ve | flame ragwort | Asteraceae
|
| PAHA16 | Packera hartiana (Heller) W.A. Weber & A. L�ve | Hart's ragwort | Asteraceae
|
| PAHE11 | Packera hesperia (Greene) W.A. Weber & A. L�ve | western ragwort | Asteraceae
|
| PAHY5 | Packera hyperborealis (Greenm.) A.& D. L�ve | northern groundsel | Asteraceae
|
| PAIN11 | Packera indecora (Greene) A.& D. L�ve | elegant groundsel | Asteraceae
|
| PAIO4 | Packera ionophylla (Greene) W.A. Weber & A. L�ve | Tehachapi ragwort | Asteraceae
|
| PALA41 | Packera layneae (Greene) W.A. Weber & A. L�ve | Layne's ragwort | Asteraceae
|
| PAMA35 | Packera macounii (Greene) W.A. Weber & A. L�ve | Siskiyou Mountain ragwort | Asteraceae
|
| PAMA36 | Packera malmstenii (Blake ex Tidestrom) Kartesz, comb. nov. ined | Podunk ragwort | Asteraceae
|
| PAMI25 | Packera millefolia (Torr. & Gray) T.M. Barkl., comb. nov. ined. | piedmont ragwort | Asteraceae
|
| PAMI26 | Packera millelobata (Rydb.) W.A. Weber & A. L�ve | Uinta ragwort | Asteraceae
|
| PAMU11 | Packera multilobata (Torr. & Gray ex Gray) W.A. Weber & A. L�ve | lobeleaf groundsel | Asteraceae
|
| PANEM2 | Packera neomexicana (Gray) W.A. Weber & A. L�ve var. metcalfei (Greene) T.M. Barkl., comb. nov. ined. | Metcalf's groundsel | Asteraceae
|
| PANEM | Packera neomexicana (Gray) W.A. Weber & A. L�ve var. mutabilis (Greene) W.A. Weber & A. L�ve | New Mexico groundsel | Asteraceae
|
| PANEN | Packera neomexicana (Gray) W.A. Weber & A. L�ve var. neomexicana | New Mexico groundsel | Asteraceae
|
| PANET2 | Packera neomexicana (Gray) W.A. Weber & A. L�ve var. toumeyi (Greene) T.M. Barkl., comb. nov. ined. | Toumey's groundsel | Asteraceae
|
| PANE7 | Packera neomexicana (Gray) W.A. Weber & A. L�ve | New Mexico groundsel | Asteraceae
|
| PAOB6 | Packera obovata (Muhl. ex Willd.) W.A. Weber & A. L�ve | roundleaf ragwort | Asteraceae
|
| PAOG | Packera ogotorukensis (Packer) A.& D. L�ve | Ogotoruk Creek ragwort | Asteraceae
|
| PAOO | Packera oodes (Rydb.) W.A. Weber | Packera streptanthifolia | Asteraceae
|
| PAPA19 | Packera pauciflora (Pursh) A.& D. L�ve | alpine groundsel | Asteraceae
|
| PAPA20 | Packera paupercula (Michx.) A.& D. L�ve | balsam groundsel | Asteraceae
|
| PAPL12 | Packera plattensis (Nutt.) W.A. Weber & A. L�ve | prairie groundsel | Asteraceae
|
| PAPO12 | Packera porteri (Greene) C. Jeffrey | Porter's groundsel | Asteraceae
|
| PAPSF | Packera pseudaurea (Rydb.) W.A. Weber & A. L�ve var. flavula (Greene) W.A. Weber & A. L�ve | falsegold groundsel | Asteraceae
|
| PAPSP2 | Packera pseudaurea (Rydb.) W.A. Weber & A. L�ve var. pseudaurea | falsegold groundsel | Asteraceae
|
| PAPSS | Packera pseudaurea (Rydb.) W.A. Weber & A. L�ve var. semicordata (Mackenzie & Bush) T.M. Barkl., comb. nov. ined. | falsegold groundsel | Asteraceae
|
| PAPS5 | Packera pseudaurea (Rydb.) W.A. Weber & A. L�ve | falsegold groundsel | Asteraceae
|
| PAQU7 | Packera quaerens (Greene) W.A. Weber & A. L�ve | Mogollon Mountain ragwort | Asteraceae
|
| PAQU8 | Packera quercetorum (Greene) C. Jeffrey | Oak Creek ragwort | Asteraceae
|
| PARE8 | Packera resedifolia (Less.) A.& D. L�ve | Packera cymbalaria | Asteraceae
|
| PASA12 | Packera sanguisorboides (Rydb.) W.A. Weber & A. L�ve | burnet ragwort | Asteraceae
|
| PASC19 | Packera schweinitziana (Nutt.) W.A. Weber & A. L�ve | Schweinitz's ragwort | Asteraceae
|
| PASP18 | Packera spellenbergii (T.M. Barkl.) C. Jeffrey | Carrizo Creek ragwort | Asteraceae
|
| PAST10 | Packera streptanthifolia (Greene) W.A. Weber & A. L�ve | Rocky Mountain groundsel | Asteraceae
|
| PATA5 | Packera tampicana (DC.) C. Jeffrey | Great Plains ragwort | Asteraceae
|
| PATO4 | Packera tomentosa (Michx.) C. Jeffrey | woolly ragwort | Asteraceae
|
| PATR7 | Packera tridenticulata (Rydb.) W.A. Weber & A. L�ve | threetooth ragwort | Asteraceae
|
| PAWE4 | Packera werneriifolia (Gray) W.A. Weber & A. L�ve | hoary groundsel | Asteraceae
|
| PACKE | Packera A. & D. L�ve | ragwort | Asteraceae
|
| PAAL15 | Padus alabamensis (C. Mohr) Small | Prunus alabamensis | Rosaceae
|
| PAAU5 | Padus australis Beadle | Prunus alabamensis | Rosaceae
|
| PACU2 | Padus cuthbertii Small | Prunus alabamensis | Rosaceae
|
| PAME5 | Padus melanocarpa (A. Nels.) Shafer | Prunus virginiana var. melanocarpa | Rosaceae
|
| PANA3 | Padus nana (Du Roi) M. Roemer | Prunus virginiana var. virginiana | Rosaceae
|
| PAVIM2 | Padus virginiana (L.) M. Roemer ssp. melanocarpa (A. Nels.) W.A. Weber | Prunus virginiana var. melanocarpa | Rosaceae
|
| PAVI11 | Padus virginiana (L.) P. Mill. | Prunus virginiana var. virginiana | Rosaceae
|
| PACR15 | Paederia cruddasiana Prain | sewer vine | Rubiaceae
|
| PAFO3 | Paederia foetida L. | stinkvine | Rubiaceae
|
| PASC15 | Paederia scandans (Lour.) Merr. | Paederia foetida | Rubiaceae
|
| PAEDE | Paederia L. | sewer vine | Rubiaceae
|
| PABRC | Paeonia brownii Dougl. ex Hook. ssp. californica (Nutt.) Abrams | Paeonia californica | Paeoniaceae
|
| PABR | Paeonia brownii Dougl. ex Hook. | Brown's peony | Paeoniaceae
|
| PACA2 | Paeonia californica Nutt. | California peony | Paeoniaceae
|
| PACA37 | Paeonia cambessedesii Willk. | Paeonia corallina | Paeoniaceae
|
| PACO55 | Paeonia corallina Retz. | peony | Paeoniaceae
|
| PADE23 | Paeonia delavayi Franch. | dian mu dan | Paeoniaceae
|