| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PESA11 | Pelea sandwicensis (Hook. & Arn.) Gray | Melicope sandwicensis | Rutaceae
|
| PESC8 | Pelea scandens St. John | Melicope radiata | Rutaceae
|
| PESE9 | Pelea semiternata St. John | Melicope lydgatei | Rutaceae
|
| PEST4 | Pelea stellata St. John | Melicope molokaiensis | Rutaceae
|
| PEST5 | Pelea storeyana St. John & Hume | Melicope christophersenii | Rutaceae
|
| PETO2 | Pelea tomentosa St. John & Hume | Melicope knudsenii | Rutaceae
|
| PEUK | Pelea ukeleteensis St. John | Melicope balloui | Rutaceae
|
| PEVOK | Pelea volcanica Gray var. kohalae B.C. Stone | Melicope volcanica | Rutaceae
|
| PEVO2 | Pelea volcanica Gray | Melicope volcanica | Rutaceae
|
| PEWA3 | Pelea wahiawaensis St. John & Hume | Melicope wawraeana | Rutaceae
|
| PEWAL | Pelea waialealae Wawra var. latior St. John & Hume | Melicope waialealae | Rutaceae
|
| PEWAP | Pelea waialealae Wawra var. pubescens Skottsberg | Melicope waialealae | Rutaceae
|
| PEWA4 | Pelea waialealae Wawra | Melicope waialealae | Rutaceae
|
| PEWA14 | Pelea wailauensis St. John | Melicope wailauensis | Rutaceae
|
| PEWA5 | Pelea waimeaensis St. John & Hume | Melicope peduncularis | Rutaceae
|
| PEWA13 | Pelea wainihaensis St. John | Melicope feddei | Rutaceae
|
| PEWA6 | Pelea waipioensis St. John | Melicope wawraeana | Rutaceae
|
| PEWAP2 | Pelea wawraeana Rock var. pubens St. John | Melicope wawraeana | Rutaceae
|
| PEWAT | Pelea wawraeana Rock var. tenuifolia St. John & Hume | Melicope peduncularis | Rutaceae
|
| PEWA7 | Pelea wawraeana Rock | Melicope wawraeana | Rutaceae
|
| PEZA | Pelea zahlbruckneri Rock | Melicope zahlbruckneri | Rutaceae
|
| PEAD3 | Pelexia adnata (Sw.) Spreng. | hachuela | Orchidaceae
|
| PESE16 | Pelexia setacea Lindl. | Eltroplectris calcarata | Orchidaceae
|
| PELEX | Pelexia Poit. ex Lindl. | hachuela | Orchidaceae
|
| PEAL15 | Pellaea alabamensis (Buckl.) Baker ex Hook. | Cheilanthes alabamensis | Pteridaceae
|
| PEANP | Pellaea andromedifolia (Kaulfuss) F�e var. pubescens Baker | Pellaea andromedifolia | Pteridaceae
|
| PEANR | Pellaea andromedifolia (Kaulfuss) F�e var. rubens D.C. Eat. | Pellaea andromedifolia | Pteridaceae
|
| PEAN2 | Pellaea andromedifolia (Kaulfuss) F�e | coffee cliffbrake | Pteridaceae
|
| PEATB | Pellaea atropurpurea (L.) Link var. bushii Mackenzie | Pellaea glabella ssp. glabella | Pteridaceae
|
| PEATS | Pellaea atropurpurea (L.) Link var. simplex (Butters) Morton | Pellaea glabella ssp. simplex | Pteridaceae
|
| PEAT2 | Pellaea atropurpurea (L.) Link | purple cliffbrake | Pteridaceae
|
| PEBR3 | Pellaea brachyptera (T. Moore) Baker | Sierra cliffbrake | Pteridaceae
|
| PEBR4 | Pellaea breweri D.C. Eat. | Brewer's cliffbrake | Pteridaceae
|
| PEBR5 | Pellaea bridgesii Hook. | Bridges' cliffbrake | Pteridaceae
|
| PECA27 | Pellaea cardiomorpha Weatherby | Pellaea cordifolia | Pteridaceae
|
| PECO22 | Pellaea compacta (Davenport) Maxon | Pellaea mucronata ssp. californica | Pteridaceae
|
| PECO20 | Pellaea cordata (Cav.) Sm. | Pellaea cordifolia | Pteridaceae
|
| PECO11 | Pellaea cordifolia (Sess� & Moc.) A.R. Sm. | heartleaf cliffbrake | Pteridaceae
|
| PEDE18 | Pellaea dealbata (Pursh) Prantl | Argyrochosma dealbata | Pteridaceae
|
| PEDE13 | Pellaea densa (Brack.) Hook. | Aspidotis densa | Pteridaceae
|
| PEFE4 | Pellaea fendleri (Kunze) Prantl | Argyrochosma fendleri | Pteridaceae
|
| PEGA5 | Pellaea gastonyi Windham | Gastony's cliffbrake | Pteridaceae
|
| PEGLG | Pellaea glabella Mett. ex Kuhn ssp. glabella | smooth cliffbrake | Pteridaceae
|
| PEGLM | Pellaea glabella Mett. ex Kuhn ssp. missouriensis (Gastony) Windham | Missouri cliffbrake | Pteridaceae
|
| PEGLO3 | Pellaea glabella Mett. ex Kuhn ssp. occidentalis (E. Nels.) Windham | western dwarf cliffbrake | Pteridaceae
|
| PEGLS3 | Pellaea glabella Mett. ex Kuhn ssp. simplex (Butters) A.& D. L�ve | smooth cliffbrake | Pteridaceae
|
| PEGLM2 | Pellaea glabella Mett. ex Kuhn var. missouriensis Gastony | Pellaea glabella ssp. missouriensis | Pteridaceae
|
| PEGLN | Pellaea glabella Mett. ex Kuhn var. nana (L.C. Rich.) Cody | Pellaea glabella ssp. occidentalis | Pteridaceae
|
| PEGLO2 | Pellaea glabella Mett. ex Kuhn var. occidentalis (E. Nels.) Butters | Pellaea glabella ssp. occidentalis | Pteridaceae
|
| PEGLS2 | Pellaea glabella Mett. ex Kuhn var. simplex Butters | Pellaea glabella ssp. simplex | Pteridaceae
|
| PEGL | Pellaea glabella Mett. ex Kuhn | smooth cliffbrake | Pteridaceae
|
| PEGL17 | Pellaea �glaciogena W.H. Wagner, Pray & A.R. Smith | | Pteridaceae
|
| PEIN | Pellaea intermedia Mett. ex Kuhn | intermediate cliffbrake | Pteridaceae
|
| PEJO3 | Pellaea jonesii (Maxon) Morton | Argyrochosma jonesii | Pteridaceae
|
| PELIM2 | Pellaea limitanea (Maxon) Morton var. mexicana (Maxon) Morton | Argyrochosma limitanea ssp. mexicana | Pteridaceae
|
| PELI12 | Pellaea limitanea (Maxon) Morton | Argyrochosma limitanea ssp. limitanea | Pteridaceae
|
| PELO8 | Pellaea longimucronata Hook. | Pellaea mucronata ssp. mucronata | Pteridaceae
|
| PELO6 | Pellaea longimucronata auct. non Hook. | Pellaea truncata | Pteridaceae
|
| PELY3 | Pellaea lyngholmii Windham | Lyngholm's cliffbrake | Pteridaceae
|
| PEMI10 | Pellaea microphylla Mett. ex Kuhn | Argyrochosma microphylla | Pteridaceae
|
| PEMUC2 | Pellaea mucronata (D.C. Eat.) D.C. Eat. ssp. californica (Lemmon) Windham | California cliffbrake | Pteridaceae
|
| PEMUM | Pellaea mucronata (D.C. Eat.) D.C. Eat. ssp. mucronata | birdfoot cliffbrake | Pteridaceae
|
| PEMUC | Pellaea mucronata (D.C. Eat.) D.C. Eat. var. californica (Lemmon) Munz & Johnston | Pellaea mucronata ssp. californica | Pteridaceae
|
| PEMU | Pellaea mucronata (D.C. Eat.) D.C. Eat. | birdfoot cliffbrake | Pteridaceae
|
| PEOCS | Pellaea occidentalis (E. Nels.) Rydb. ssp. simplex (Butters) Gastony | Pellaea glabella ssp. simplex | Pteridaceae
|
| PEOC | Pellaea occidentalis (E. Nels.) Rydb. | Pellaea glabella ssp. occidentalis | Pteridaceae
|
| PEOV | Pellaea ovata (Desv.) Weatherby | ovateleaf cliffbrake | Pteridaceae
|
| PESAC | Pellaea sagittata (Cav.) Link var. cordata (Cav.) A. Tryon | Pellaea cordifolia | Pteridaceae
|
| PESU3 | Pellaea suksdorfiana Butters | Pellaea glabella ssp. simplex | Pteridaceae
|
| PETEA | Pellaea ternifolia (Cav.) Link ssp. arizonica Windham | Arizonia cliffbrake | Pteridaceae
|
| PETET | Pellaea ternifolia (Cav.) Link ssp. ternifolia | TransPecos cliffbrake | Pteridaceae
|
| PETEV | Pellaea ternifolia (Cav.) Link ssp. villosa Windham | TransPecos cliffbrake | Pteridaceae
|
| PETEW | Pellaea ternifolia (Cav.) Link var. wrightiana (Hook.) A. Tryon | Pellaea wrightiana | Pteridaceae
|
| PETE2 | Pellaea ternifolia (Cav.) Link | TransPecos cliffbrake | Pteridaceae
|
| PETR3 | Pellaea truncata Goodding | spiny cliffbrake | Pteridaceae
|
| PEVI7 | Pellaea viridis (Forsk.) Prantl | green cliffbrake | Pteridaceae
|
| PEWR | Pellaea wrightiana Hook. | Wright's cliffbrake | Pteridaceae
|
| PELLA | Pellaea Link | cliffbrake | Pteridaceae
|
| PEAP3 | Pellia appalachiana R. M. Schust. pro hybr. | | Pelliaceae
|
| PEENA | Pellia endiviifolia (Dicks.) Dumort. ssp. alpicola R. M. Schust. | | Pelliaceae
|
| PEENE | Pellia endiviifolia (Dicks.) Dumort. ssp. endiviifolia | | Pelliaceae
|
| PEEN | Pellia endiviifolia (Dicks.) Dumort. | | Pelliaceae
|
| PEEP3 | Pellia epiphylla (L.) Corda | | Pelliaceae
|
| PEME14 | Pellia megaspora R. M. Schust. | | Pelliaceae
|
| PENEC | Pellia neesiana (Gottsche) Limpr. ssp. columbiana (Krajina & Brayshaw) R. M. Schust. | | Pelliaceae
|
| PENEN3 | Pellia neesiana (Gottsche) Limpr. ssp. neesiana | | Pelliaceae
|
| PENE14 | Pellia neesiana (Gottsche) Limpr. | | Pelliaceae
|
| PELLI | Pellia Raddi nom. cons. | | Pelliaceae
|
| PEGL12 | Peltandra glauca (Ell.) Feay | Peltandra sagittifolia | Araceae
|
| PELU | Peltandra luteospadix Fern. | Peltandra sagittifolia | Araceae
|
| PESA7 | Peltandra sagittifolia (Michx.) Morong | white arrow arum | Araceae
|
| PETH8 | Peltandra tharpii Barkl. | Peltandra virginica | Araceae
|
| PEVIL | Peltandra virginica (L.) Schott ssp. luteospadix (Fern.) W.H. & K.P. Blackwell | Peltandra sagittifolia | Araceae
|
| PEVI | Peltandra virginica (L.) Schott | green arrow arum | Araceae
|
| PELTA | Peltandra Raf. | arrow arum | Araceae
|
| PEPE4 | Peltapteris peltata (Sw.) Morton | Elaphoglossum peltatum | Dryopteridaceae
|
| PEAPV | Peltigera aphthosa (L.) Willd var. variolosa A. Massal. | Peltigera leucophlebia | Peltigeraceae
|
| PEAP60 | Peltigera aphthosa (L.) Willd. | felt lichen | Peltigeraceae
|
| PEBR21 | Peltigera britannica (Gyelnik) Holt.-Hartw. & Tonsb. | British felt lichen | Peltigeraceae
|
| PECAR2 | Peltigera canina (L.) Willd. var. rufescens (Weis) Mudd | Peltigera rufescens | Peltigeraceae
|
| PECAS2 | Peltigera canina (L.) Willd. var. spuria (Ach.) Schaerer | Peltigera didactyla | Peltigeraceae
|