| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PERO3 | Peperomia robustior Urban | grand peperomia | Piperaceae
|
| PERO4 | Peperomia rockii C. DC. | Kahuaha Forest peperomia | Piperaceae
|
| PERO5 | Peperomia rotundifolia (L.) Kunth | yerba linda | Piperaceae
|
| PESAR | Peperomia sandwicensis Miq. var. robusta Wawra | Peperomia sandwicensis | Piperaceae
|
| PESA8 | Peperomia sandwicensis Miq. | singlespike peperomia | Piperaceae
|
| PESE8 | Peperomia serpens (Sw.) Loud. | vinagre | Piperaceae
|
| PESI3 | Peperomia sintenisii C. DC. | Sintenis' peperomia | Piperaceae
|
| PESP4 | Peperomia spathulifolia Small | Peperomia magnoliifolia | Piperaceae
|
| PESU4 | Peperomia subpetiolata Yuncker | Waikamoi peperomia | Piperaceae
|
| PETE7 | Peperomia tenella (Sw.) A. Dietr. | jayuya | Piperaceae
|
| PETEE | Peperomia tetraphylla (G. Forst.) Hook. & Arn. var. elongata (Hbd.) O.& I. Deg. | Peperomia tetraphylla | Piperaceae
|
| PETEP | Peperomia tetraphylla (G. Forst.) Hook. & Arn. var. parvifolia (C. DC.) O.& I. Deg. | Peperomia tetraphylla | Piperaceae
|
| PETE8 | Peperomia tetraphylla (G. Forst.) Hook. & Arn. | acorn peperomia | Piperaceae
|
| PETR4 | Peperomia treleasei Yuncker | Peperomia eekana | Piperaceae
|
| PETR5 | Peperomia trichostigma C. DC. | Peperomia remyi | Piperaceae
|
| PEUR | Peperomia urocarpa Fisch. & C.A. Mey. | Brazilian peperomia | Piperaceae
|
| PEVI16 | Peperomia viridispica Trel. | Peperomia pereskiifolia | Piperaceae
|
| PEWA11 | Peperomia waihoiana St. John | Peperomia latifolia | Piperaceae
|
| PEWA2 | Peperomia waikamoiana Yuncker | Peperomia eekana | Piperaceae
|
| PEWA12 | Peperomia waipioana Yuncker | Peperomia membranacea | Piperaceae
|
| PEWH2 | Peperomia wheeleri Britt. | Wheeler's peperomia | Piperaceae
|
| PEYA | Peperomia yabucoana Urban & C. DC. | viper peperomia | Piperaceae
|
| PEPER | Peperomia Ruiz & Pav�n | peperomia | Piperaceae
|
| PEDI11 | Peplis diandra Nutt. ex DC. | Didiplis diandra | Lythraceae
|
| PEPO6 | Peplis portula L. | Lythrum portula | Lythraceae
|
| PEFO4 | Pepo foetidissima (Kunth) Britt. | Cucurbita foetidissima | Cucurbitaceae
|
| PEMO8 | Pepo moschata (Duchesne ex Lam.) Britt. | Cucurbita moschata | Cucurbitaceae
|
| PEOK2 | Pepo okeechobeensis Small | Cucurbita okeechobeensis | Cucurbitaceae
|
| PEPE21 | Pepo pepo (L.) Britt. ex Small | Cucurbita pepo var. pepo | Cucurbitaceae
|
| PEBU2 | Pera bumeliifolia Griseb. | jiqi | Euphorbiaceae
|
| PERA7 | Pera Mutis | pera | Euphorbiaceae
|
| PEDE14 | Peramium decipiens (Hook.) Piper | Goodyera oblongifolia | Orchidaceae
|
| PEOP2 | Peramium ophioides (Fern.) Rydb. | Goodyera repens | Orchidaceae
|
| PEPU20 | Peramium pubescens (Willd.) MacM. | Goodyera pubescens | Orchidaceae
|
| PETE14 | Peramium tesselatum (Lodd.) Heller | Goodyera tesselata | Orchidaceae
|
| PERA4 | Peraphyllum ramosissimum Nutt. | | Rosaceae
|
| PERAP | Peraphyllum Nutt. | peraphyllum | Rosaceae
|
| PEACG | Pereskia aculeata P. Mill. var. godseffiana (hort. ex Gard. Chron.) Backeberg & F.M. Knuth ex Krainz | Pereskia aculeata | Cactaceae
|
| PEAC2 | Pereskia aculeata P. Mill. | Barbados shrub | Cactaceae
|
| PEGR14 | Pereskia grandifolia Haw. | rose cactus | Cactaceae
|
| PEPE20 | Pereskia pereskia (L.) Karst. | Pereskia aculeata | Cactaceae
|
| PERES | Pereskia P. Mill. | pereskia | Cactaceae
|
| PEMI11 | Perezia microcephala (DC.) Gray | Acourtia microcephala | Asteraceae
|
| PENA5 | Perezia nana Gray | Acourtia nana | Asteraceae
|
| PERU7 | Perezia runcinata (Lag. ex D. Don) Lag. ex Gray | Acourtia runcinata | Asteraceae
|
| PETH6 | Perezia thurberi Gray | Acourtia thurberi | Asteraceae
|
| PEWR4 | Perezia wrightii Gray | Acourtia wrightii | Asteraceae
|
| PEMI16 | Perforaria minuta Degel. | Coccotrema pocillarium | Coccotremataceae
|
| PEAF2 | Pergularia africana N. E. Br. | Telosma africana | Asclepiadaceae
|
| PEDA4 | Pergularia daemia (Forsskal) Chiov. | pergularia | Asclepiadaceae
|
| PERGU | Pergularia L. | pergularia | Asclepiadaceae
|
| PECU4 | Pericallis cuneata (L'H�r.) Bolle | common ragwort | Asteraceae
|
| PERIC4 | Pericallis Webb | ragwort | Asteraceae
|
| PECAG | Pericome caudata Gray var. glandulosa (Goodman) Harrington | Pericome caudata | Asteraceae
|
| PECA10 | Pericome caudata Gray | mountain tail-leaf | Asteraceae
|
| PERIC | Pericome Gray | pericome | Asteraceae
|
| PEMO13 | Pericopsis mooniana Thw. | | Fabaceae
|
| PERIC5 | Pericopsis Thwaites | | Fabaceae
|
| PEAM2 | Perideridia americana (Nutt. ex DC.) Reichenb. | eastern yampah | Apiaceae
|
| PEBA5 | Perideridia bacigalupii Chuang & Constance | Mother Lode yampah | Apiaceae
|
| PEBOB | Perideridia bolanderi (Gray) A. Nels. & J.F. Macbr. ssp. bolanderi | Bolander's yampah | Apiaceae
|
| PEBOI | Perideridia bolanderi (Gray) A. Nels. & J.F. Macbr. ssp. involucrata Chuang & Constance | Bolander's yampah | Apiaceae
|
| PEBO2 | Perideridia bolanderi (Gray) A. Nels. & J.F. Macbr. | Bolander's yampah | Apiaceae
|
| PECA14 | Perideridia californica (Torr.) A. Nels. & J.F. Macbr. | California yampah | Apiaceae
|
| PEER3 | Perideridia erythrorhiza (Piper) Chuang & Constance | western yampah | Apiaceae
|
| PEGAB | Perideridia gairdneri (Hook. & Arn.) Mathias ssp. borealis Chuang & Constance | common yampah | Apiaceae
|
| PEGAG | Perideridia gairdneri (Hook. & Arn.) Mathias ssp. gairdneri | Gairdner's yampah | Apiaceae
|
| PEGA3 | Perideridia gairdneri (Hook. & Arn.) Mathias | Gardner's yampah | Apiaceae
|
| PEHO5 | Perideridia howellii (Coult. & Rose) Mathias | Howell's yampah | Apiaceae
|
| PEKE | Perideridia kelloggii (Gray) Mathias | Kellogg's yampah | Apiaceae
|
| PELE5 | Perideridia lemmonii (Coult. & Rose) Chuang & Constance | Lemmon's yampah | Apiaceae
|
| PELE6 | Perideridia leptocarpa Chuang & Constance | narrowseed yampah | Apiaceae
|
| PEMO7 | Perideridia montana (Blank.) Dorn | Perideridia gairdneri ssp. borealis | Apiaceae
|
| PEOR6 | Perideridia oregana (S. Wats.) Mathias | Oregon yampah | Apiaceae
|
| PEPAL | Perideridia parishii (Coult. & Rose) A. Nels. & J.F. Macbr. ssp. latifolia (Gray) Chuang & Constance | Parish's yampah | Apiaceae
|
| PEPAP2 | Perideridia parishii (Coult. & Rose) A. Nels. & J.F. Macbr. ssp. parishii | Parish's yampah | Apiaceae
|
| PEPA21 | Perideridia parishii (Coult. & Rose) A. Nels. & J.F. Macbr. | Parish's yampah | Apiaceae
|
| PEPR5 | Perideridia pringlei (Coult. & Rose) A. Nels. & J.F. Macbr. | adobe yampah | Apiaceae
|
| PERID | Perideridia Reichenb. | yampah | Apiaceae
|
| PEGR23 | Peridiothelia grandiuscula (Anzi) D. Hawksw. | | Pleomassariaceae
|
| PERID4 | Peridiothelia D. Hawksw. | peridiothelia | Pleomassariaceae
|
| PEAR12 | Perilla arguta Benth. | Perilla frutescens | Lamiaceae
|
| PEFRC2 | Perilla frutescens (L.) Britt. var. crispa (Benth.) Deane | beefsteakplant | Lamiaceae
|
| PEFRF2 | Perilla frutescens (L.) Britt. var. frutescens | beefsteakplant | Lamiaceae
|
| PEFR4 | Perilla frutescens (L.) Britt. | beefsteakplant | Lamiaceae
|
| PEOC7 | Perilla ocymoides L. | Perilla frutescens | Lamiaceae
|
| PERIL | Perilla L. | perilla | Lamiaceae
|
| PEGR9 | Periploca graeca L. | silkvine | Asclepiadaceae
|
| PERIP | Periploca L. | periploca | Asclepiadaceae
|
| PEAG | Perityle aglossa Gray | bluff rockdaisy | Asteraceae
|
| PEAJ | Perityle ajoensis T.K. Todsen | Ajo rockdaisy | Asteraceae
|
| PEAM11 | Perityle ambrosiifolia Greene ex A.M. Powell & S.C. Yarborough | lace-leaved rockdaisy | Asteraceae
|
| PEAN6 | Perityle angustifolia (Gray) Shinners | narrow-leaved rockdaisy | Asteraceae
|
| PEBIA | Perityle bisetosa (Torr. ex Gray) Shinners var. appressa A. Powell | twobristle rockdaisy | Asteraceae
|
| PEBIB | Perityle bisetosa (Torr. ex Gray) Shinners var. bisetosa | twobristle rockdaisy | Asteraceae
|
| PEBIS | Perityle bisetosa (Torr. ex Gray) Shinners var. scalaris A. Powell | twobristle rockdaisy | Asteraceae
|
| PEBI | Perityle bisetosa (Torr. ex Gray) Shinners | twobristle rockdaisy | Asteraceae
|
| PECE3 | Perityle cernua (Greene) Shinners | Organ Mountain rockdaisy | Asteraceae
|
| PECI8 | Perityle ciliata (L.H. Dewey) Rydb. | fringed rockdaisy | Asteraceae
|
| PECI9 | Perityle cinerea (Gray) A. Powell | gray rockdaisy | Asteraceae
|
| PECO17 | Perityle cochisensis (Niles) A. Powell | Cochise rockdaisy | Asteraceae
|