| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PARMO | Parmotrema A. Massal. | parmotrema | Parmeliaceae
|
| PAAN11 | Parmotremopsis antillensis (Nyl.) Elix & Hale | | Parmeliaceae
|
| PARMO2 | Parmotremopsis Elix & Hale | parmotremopsis | Parmeliaceae
|
| PABR9 | Parmularia brouardii de Lesd. | Lecanora brouardii | Lecanoraceae
|
| PANO5 | Parmularia novomexicana de Lesd. | Lecanora novomexicana | Lecanoraceae
|
| PAAM5 | Parnassia americana Muhl. | Parnassia glauca | Saxifragaceae
|
| PAAS2 | Parnassia asarifolia Vent. | kidneyleaf grass of Parnassus | Saxifragaceae
|
| PACA18 | Parnassia californica (Gray) Greene | California grass of Parnassus | Saxifragaceae
|
| PACA13 | Parnassia caroliniana Michx. | Carolina grass of Parnassus | Saxifragaceae
|
| PACII | Parnassia cirrata Piper var. intermedia (Rydb.) P. & N. Holmgren | Parnassia fimbriata var. intermedia | Saxifragaceae
|
| PACI2 | Parnassia cirrata Piper | San Bernardino grass of Parnassus | Saxifragaceae
|
| PAFIF | Parnassia fimbriata Koenig var. fimbriata | fringed grass of Parnassus | Saxifragaceae
|
| PAFIH | Parnassia fimbriata Koenig var. hoodiana C.L. Hitchc. | fringed grass of Parnassus | Saxifragaceae
|
| PAFII | Parnassia fimbriata Koenig var. intermedia (Rydb.) C.L. Hitchc. | fringed grass of Parnassus | Saxifragaceae
|
| PAFI3 | Parnassia fimbriata Koenig | fringed grass of Parnassus | Saxifragaceae
|
| PAFL9 | Parnassia floridana Rydb. | Parnassia caroliniana | Saxifragaceae
|
| PAGL3 | Parnassia glauca Raf. | fen grass of Parnassus | Saxifragaceae
|
| PAGR | Parnassia grandifolia DC. | largeleaf grass of Parnassus | Saxifragaceae
|
| PAIN9 | Parnassia intermedia Rydb. | Parnassia fimbriata var. intermedia | Saxifragaceae
|
| PAKOP | Parnassia kotzebuei Cham. ex Spreng. var. pumila C.L. Hitchc. & Ownbey | Parnassia kotzebuei | Saxifragaceae
|
| PAKO3 | Parnassia kotzebuei Cham. ex Spreng. | Kotzebue's grass of Parnassus | Saxifragaceae
|
| PAMO12 | Parnassia montanensis Fern. & Rydb. ex Rydb. | Parnassia palustris var. montanensis | Saxifragaceae
|
| PAMU12 | Parnassia multiseta (Ledeb.) Fern. | Parnassia palustris var. tenuis | Saxifragaceae
|
| PAPAN2 | Parnassia palustris L. ssp. neogaea (Fern.) Hult�n | Parnassia palustris var. tenuis | Saxifragaceae
|
| PAPAC | Parnassia palustris L. var. californica Gray | Parnassia californica | Saxifragaceae
|
| PAPAM2 | Parnassia palustris L. var. montanensis (Fern. & Rydb. ex Rydb.) C.L. Hitchc. | mountain grass of Parnassus | Saxifragaceae
|
| PAPAN | Parnassia palustris L. var. neogaea Fern. | Parnassia palustris var. tenuis | Saxifragaceae
|
| PAPAP | Parnassia palustris L. var. palustris | Alaska grass of Parnassus | Saxifragaceae
|
| PAPAP2 | Parnassia palustris L. var. parviflora (DC.) Boivin | smallflower grass of Parnassus | Saxifragaceae
|
| PAPAT | Parnassia palustris L. var. tenuis Wahlenb. | marsh grass of Parnassus | Saxifragaceae
|
| PAPA8 | Parnassia palustris L. | marsh grass of Parnassus | Saxifragaceae
|
| PAPA9 | Parnassia parviflora DC. | Parnassia palustris var. parviflora | Saxifragaceae
|
| PARNA | Parnassia L. | grass of Parnassus | Saxifragaceae
|
| PACO56 | Parodia concinna (Monv.) N.P. Taylor | | Cactaceae
|
| PAROD | Parodia Speg. | parodia | Cactaceae
|
| PAAH | Paronychia ahartii Ertter | Ahart's nailwort | Caryophyllaceae
|
| PAAMA | Paronychia americana (Nutt.) Fenzl ex Walp. ssp. americana | American nailwort | Caryophyllaceae
|
| PAAMP | Paronychia americana (Nutt.) Fenzl ex Walp. ssp. pauciflora (Small) Chaudhri | American nailwort | Caryophyllaceae
|
| PAAM3 | Paronychia americana (Nutt.) Fenzl ex Walp. | American nailwort | Caryophyllaceae
|
| PAARA3 | Paronychia argyrocoma (Michx.) Nutt. ssp. albimontana (Fern.) Maguire | Paronychia argyrocoma | Caryophyllaceae
|
| PAARA | Paronychia argyrocoma (Michx.) Nutt. var. albimontana Fern. | Paronychia argyrocoma | Caryophyllaceae
|
| PAAR4 | Paronychia argyrocoma (Michx.) Nutt. | silvery nailwort | Caryophyllaceae
|
| PABAB | Paronychia baldwinii (Torr. & Gray) Fenzl ex Walp. ssp. baldwinii | Baldwin's nailwort | Caryophyllaceae
|
| PABAR | Paronychia baldwinii (Torr. & Gray) Fenzl ex Walp. ssp. riparia (Chapman) Chaudhri | Baldwin's nailwort | Caryophyllaceae
|
| PABAC2 | Paronychia baldwinii (Torr. & Gray) Fenzl ex Walp. var. ciliata Chaudhri | Paronychia baldwinii ssp. riparia | Caryophyllaceae
|
| PABA3 | Paronychia baldwinii (Torr. & Gray) Fenzl ex Walp. | Baldwin's nailwort | Caryophyllaceae
|
| PACA11 | Paronychia canadensis (L.) Wood | smooth forked nailwort | Caryophyllaceae
|
| PACHC | Paronychia chartacea Fern. ssp. chartacea | paper nailwort | Caryophyllaceae
|
| PACHM | Paronychia chartacea Fern. ssp. minima L.C. Anders. | paper nailwort | Caryophyllaceae
|
| PACH6 | Paronychia chartacea Fern. | paper nailwort | Caryophyllaceae
|
| PACH4 | Paronychia chorizanthoides Small | Paronychia lindheimeri var. lindheimeri | Caryophyllaceae
|
| PACO16 | Paronychia congesta Correll | Rio Grande nailwort | Caryophyllaceae
|
| PADEB | Paronychia depressa (Torr. & Gray) Nutt. ex A. Nels. var. brevicuspis (A. Nels.) Chaudhri | Paronychia depressa | Caryophyllaceae
|
| PADED | Paronychia depressa (Torr. & Gray) Nutt. ex A. Nels. var. diffusa (A. Nels.) Chaudhri | Paronychia depressa | Caryophyllaceae
|
| PADE4 | Paronychia depressa (Torr. & Gray) Nutt. ex A. Nels. | spreading nailwort | Caryophyllaceae
|
| PADI13 | Paronychia dichotoma (Michx.) A. Nels. | Paronychia canadensis | Caryophyllaceae
|
| PADI14 | Paronychia diffusa A. Nels. | Paronychia depressa | Caryophyllaceae
|
| PADRP | Paronychia drummondii Torr. & Gray ssp. parviflora Chaudhri | Paronychia drummondii | Caryophyllaceae
|
| PADR | Paronychia drummondii Torr. & Gray | Drummond's nailwort | Caryophyllaceae
|
| PAEC2 | Paronychia echinulata Chater | Eurasian nailwort | Caryophyllaceae
|
| PAERC | Paronychia erecta (Chapman) Shinners var. corymbosa (Small) Chaudhri | squareflower | Caryophyllaceae
|
| PAERE | Paronychia erecta (Chapman) Shinners var. erecta | squareflower | Caryophyllaceae
|
| PAER2 | Paronychia erecta (Chapman) Shinners | squareflower | Caryophyllaceae
|
| PAFAF | Paronychia fastigiata (Raf.) Fern. var. fastigiata | hairy forked nailwort | Caryophyllaceae
|
| PAFAN | Paronychia fastigiata (Raf.) Fern. var. nuttallii (Small) Fern. | hairy forked nailwort | Caryophyllaceae
|
| PAFAP | Paronychia fastigiata (Raf.) Fern. var. paleacea Fern. | hairy forked nailwort | Caryophyllaceae
|
| PAFAP2 | Paronychia fastigiata (Raf.) Fern. var. pumila (Wood) Fern. | Paronychia montana | Caryophyllaceae
|
| PAFAT | Paronychia fastigiata (Raf.) Fern. var. typica Fern. | Paronychia fastigiata var. fastigiata | Caryophyllaceae
|
| PAFA3 | Paronychia fastigiata (Raf.) Fern. | hairy forked nailwort | Caryophyllaceae
|
| PAFR | Paronychia franciscana Eastw. | San Francisco nailwort | Caryophyllaceae
|
| PAHE6 | Paronychia herniarioides (Michx.) Nutt. | coastalplain nailwort | Caryophyllaceae
|
| PAJAH | Paronychia jamesii Torr. & Gray var. hirsuta Chaudhri | Paronychia jamesii | Caryophyllaceae
|
| PAJAP | Paronychia jamesii Torr. & Gray var. parviflora Chaudhri | Paronychia jamesii | Caryophyllaceae
|
| PAJAP2 | Paronychia jamesii Torr. & Gray var. praelongifolia Correll | Paronychia jamesii | Caryophyllaceae
|
| PAJA | Paronychia jamesii Torr. & Gray | James' nailwort | Caryophyllaceae
|
| PAJO2 | Paronychia jonesii M.C. Johnston | Jones' nailwort | Caryophyllaceae
|
| PALIL2 | Paronychia lindheimeri Engelm. ex Gray var. lindheimeri | forked nailwort | Caryophyllaceae
|
| PALIL | Paronychia lindheimeri Engelm. ex Gray var. longibracteata Chaudhri | forked nailwort | Caryophyllaceae
|
| PALI5 | Paronychia lindheimeri Engelm. ex Gray | forked nailwort | Caryophyllaceae
|
| PALU5 | Paronychia lundelliorum Turner | Lundell's nailwort | Caryophyllaceae
|
| PAMA7 | Paronychia maccartii Correll | McCart's nailwort | Caryophyllaceae
|
| PAMO7 | Paronychia montana (Small) Pax & K. Hoffmann | mountain nailwort | Caryophyllaceae
|
| PAMO8 | Paronychia monticola Cory | Livermore nailwort | Caryophyllaceae
|
| PANU8 | Paronychia nudata Correll | Paronychia monticola | Caryophyllaceae
|
| PAPA21 | Paronychia parksii Cory | Paronychia virginica | Caryophyllaceae
|
| PAPA16 | Paronychia patula Shinners | pineland nailwort | Caryophyllaceae
|
| PAPUL | Paronychia pulvinata Gray var. longiaristata Chaudhri | Paronychia pulvinata | Caryophyllaceae
|
| PAPU9 | Paronychia pulvinata (Small) Pax & K. Hoffmann | Paronychia chartacea ssp. chartacea | Caryophyllaceae
|
| PAPU2 | Paronychia pulvinata Gray | Rocky Mountain nailwort | Caryophyllaceae
|
| PARI5 | Paronychia riparia Chapman | Paronychia baldwinii ssp. riparia | Caryophyllaceae
|
| PARUI | Paronychia rugelii (Chapman) Shuttlw. ex Chapman var. interior (Small) Chaudhri | Rugel's nailwort | Caryophyllaceae
|
| PARUR | Paronychia rugelii (Chapman) Shuttlw. ex Chapman var. rugelii | Rugel's nailwort | Caryophyllaceae
|
| PARU2 | Paronychia rugelii (Chapman) Shuttlw. ex Chapman | Rugel's nailwort | Caryophyllaceae
|
| PASC13 | Paronychia scoparia Small | Paronychia virginica | Caryophyllaceae
|
| PASEP2 | Paronychia sessiliflora Nutt. ssp. pulvinata (Gray) W.A. Weber | Paronychia pulvinata | Caryophyllaceae
|
| PASE | Paronychia sessiliflora Nutt. | creeping nailwort | Caryophyllaceae
|
| PASEL2 | Paronychia setacea Torr. & Gray var. longibracteata Chaudhri | bristle nailwort | Caryophyllaceae
|
| PASES3 | Paronychia setacea Torr. & Gray var. setacea | bristle nailwort | Caryophyllaceae
|
| PASE2 | Paronychia setacea Torr. & Gray | bristle nailwort | Caryophyllaceae
|
| PAVIP | Paronychia virginica Spreng. var. parksii (Cory) Chaudhri | Paronychia virginica | Caryophyllaceae
|
| PAVIS3 | Paronychia virginica Spreng. var. scoparia (Small) Cory | Paronychia virginica | Caryophyllaceae
|