| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PRAL2 | Prenanthes alba L. | white rattlesnakeroot | Asteraceae
|
| PRALC | Prenanthes altissima L. var. cinnamomea Fern. | Prenanthes altissima | Asteraceae
|
| PRAL3 | Prenanthes altissima L. | tall rattlesnakeroot | Asteraceae
|
| PRAS | Prenanthes aspera Michx. | rough rattlesnakeroot | Asteraceae
|
| PRAU | Prenanthes autumnalis Walt. | slender rattlesnakeroot | Asteraceae
|
| PRBA | Prenanthes barbata (Torr. & Gray) Milstead | barbed rattlesnakeroot | Asteraceae
|
| PRBO2 | Prenanthes boottii (DC.) Gray | alpine rattlesnakeroot | Asteraceae
|
| PRCR | Prenanthes crepidinea Michx. | nodding rattlesnakeroot | Asteraceae
|
| PRCY | Prenanthes cylindrica (Small) E.L. Braun | Prenanthes roanensis | Asteraceae
|
| PRIN7 | Prenanthes integrifolia (Cass.) Small | Prenanthes serpentaria | Asteraceae
|
| PRLE | Prenanthes lessingii Hult�n | Prenanthes alata | Asteraceae
|
| PRMA8 | Prenanthes �mainensis Gray (pro sp.) | | Asteraceae
|
| PRNA | Prenanthes nana (Bigelow) Torr. | dwarf rattlesnakeroot | Asteraceae
|
| PRRAM | Prenanthes racemosa Michx. ssp. multiflora Cronq. | purple rattlesnakeroot | Asteraceae
|
| PRRAR | Prenanthes racemosa Michx. ssp. racemosa | purple rattlesnakeroot | Asteraceae
|
| PRRAM2 | Prenanthes racemosa Michx. var. multiflora (Cronq.) Dorn | Prenanthes racemosa ssp. multiflora | Asteraceae
|
| PRRA | Prenanthes racemosa Michx. | purple rattlesnakeroot | Asteraceae
|
| PRRO2 | Prenanthes roanensis (Chickering) Chickering | Roan Mountain rattlesnakeroot | Asteraceae
|
| PRSA | Prenanthes sagittata (Gray) A. Nels. | arrowleaf rattlesnakeroot | Asteraceae
|
| PRSEB | Prenanthes serpentaria Pursh var. barbata Torr. & Gray | Prenanthes barbata | Asteraceae
|
| PRSE | Prenanthes serpentaria Pursh | cankerweed | Asteraceae
|
| PRTRN | Prenanthes trifoliolata (Cass.) Fern. var. nana (Bigelow) Fern. | Prenanthes nana | Asteraceae
|
| PRTR | Prenanthes trifoliolata (Cass.) Fern. | gall of the earth | Asteraceae
|
| PRVI4 | Prenanthes virgata Michx. | Prenanthes autumnalis | Asteraceae
|
| PRENA | Prenanthes L. | rattlesnakeroot | Asteraceae
|
| PROL | Prescotia oligantha (Sw.) Lindl. | small Prescott orchid | Orchidaceae
|
| PRPE4 | Prescotia pellucida Lindl. | Cuban Prescott orchid | Orchidaceae
|
| PRST2 | Prescotia stachyodes (Sw.) Lindl. | mountain Prescott orchid | Orchidaceae
|
| PRESC | Prescotia Lindl. | Prescott orchid | Orchidaceae
|
| PRACM | Prestoea acuminata (Willd.) H.E. Moore var. montana (Graham) A. Henderson & G. Galeano | Sierran palm | Arecaceae
|
| PRAC | Prestoea acuminata (Willd.) H.E. Moore | Sierran palm | Arecaceae
|
| PRMO | Prestoea montana (Graham) Nichols. | Prestoea acuminata var. montana | Arecaceae
|
| PREST | Prestoea Hook. f. | prestoea | Arecaceae
|
| PRAG | Prestonia agglutinata (Jacq.) Woods. | babeiro | Apocynaceae
|
| PREST2 | Prestonia R. Br. | prestonia | Apocynaceae
|
| PRAJ | Primula ajanensis E. Busch | Primula borealis | Primulaceae
|
| PRAL6 | Primula alcalina Cholewa & D. Henderson | bluedome primrose | Primulaceae
|
| PRAN | Primula angustifolia Torr. | alpine primrose | Primulaceae
|
| PRAN5 | Primula anisodora Balf. f. & G. Forrest | anise primrose | Primulaceae
|
| PRAN4 | Primula anvilensis S. Kelso | boreal primrose | Primulaceae
|
| PRBA3 | Primula baileyana Kingdon-Ward | | Primulaceae
|
| PRBOA | Primula borealis Duby var. ajanensis (E. Busch) Hult�n | Primula borealis | Primulaceae
|
| PRBO | Primula borealis Duby | northern primrose | Primulaceae
|
| PRBR2 | Primula brodheadiae M.E. Jones | Primula cusickiana | Primulaceae
|
| PRCA3 | Primula capillaris N.& A. Holmgren | Ruby Mountain primrose | Primulaceae
|
| PRCH | Primula chamissonis E. Busch | Primula borealis | Primulaceae
|
| PRCL | Primula clusiana auct. non Tausch | Primula nutans | Primulaceae
|
| PRCUC | Primula cuneifolia Ledeb. ssp. cuneifolia | wedgeleaf primrose | Primulaceae
|
| PRCUS | Primula cuneifolia Ledeb. ssp. saxifragifolia (Lehm.) W.W. Sm. & G. Forrest | wedgeleaf primrose | Primulaceae
|
| PRCUS2 | Primula cuneifolia Ledeb. var. saxifragifolia (Lehm.) Pax & R. Knuth | Primula cuneifolia ssp. saxifragifolia | Primulaceae
|
| PRCU | Primula cuneifolia Ledeb. | wedgeleaf primrose | Primulaceae
|
| PRCU2 | Primula cusickiana (Gray) Gray | Cusick's primrose | Primulaceae
|
| PRDO3 | Primula domensis Kass & Welsh | House Range primrose | Primulaceae
|
| PREG | Primula egaliksensis Wormsk. ex Hornem. | Greenland primrose | Primulaceae
|
| PREL3 | Primula elatior (L.) Hill | oxlip | Primulaceae
|
| PREL2 | Primula ellisiae Pollard & Cockerell | Primula rusbyi | Primulaceae
|
| PREX2 | Primula eximia Greene | arctic primrose | Primulaceae
|
| PRFAM | Primula farinosa L. var. macropoda Fern. | Primula laurentiana | Primulaceae
|
| PRFA3 | Primula farinosa auct. non L. | Primula laurentiana | Primulaceae
|
| PRGR3 | Primula groenlandica (Warming) W.W. Sm. & G. Forrest | Primula egaliksensis | Primulaceae
|
| PRHU | Primula hunnewellii Fern. | Primula specuicola | Primulaceae
|
| PRIN | Primula incana M.E. Jones | silvery primrose | Primulaceae
|
| PRIN6 | Primula intercedens Fern. | Primula mistassinica | Primulaceae
|
| PRJA2 | Primula japonica Gray | Japanese primrose | Primulaceae
|
| PRKA5 | Primula kawasimae Hara | Primula borealis | Primulaceae
|
| PRLA | Primula laurentiana Fern. | birdeye primrose | Primulaceae
|
| PRMA7 | Primula maguirei L.O. Williams | Maguire's primrose | Primulaceae
|
| PRMII | Primula mistassinica Michx. var. intercedens (Fern.) Boivin | Primula mistassinica | Primulaceae
|
| PRMIM | Primula mistassinica Michx. var. macropoda (Fern.) Boivin | Primula laurentiana | Primulaceae
|
| PRMIN | Primula mistassinica Michx. var. noveboracensis Fern. | Primula mistassinica | Primulaceae
|
| PRMI | Primula mistassinica Michx. | Mistassini primrose | Primulaceae
|
| PRNE | Primula nevadensis N. Holmgren | Nevada primrose | Primulaceae
|
| PRNU | Primula nutans Georgi | Siberian primrose | Primulaceae
|
| PRPA | Primula parryi Gray | Parry's primrose | Primulaceae
|
| PRPA7 | Primula parviflora Duby | Primula borealis | Primulaceae
|
| PRPO2 | Primula �polyantha P. Mill. (pro sp.) | elatior hybrid primroses | Primulaceae
|
| PRPU2 | Primula pulverulenta Duthie | | Primulaceae
|
| PRRU | Primula rusbyi Greene | Rusby's primrose | Primulaceae
|
| PRSI | Primula sibirica Jacq. | Primula nutans | Primulaceae
|
| PRSP2 | Primula specuicola Rydb. | cavedwelling primrose | Primulaceae
|
| PRSU | Primula suffrutescens Gray | Sierra primrose | Primulaceae
|
| PRTE2 | Primula tenuis Small | Primula borealis | Primulaceae
|
| PRTSA2 | Primula tschuktschorum Kjellm. ssp. arctica (Koidzumi) A.& D. L�ve | Primula eximia | Primulaceae
|
| PRTSB | Primula tschuktschorum Kjellm. ssp. beringensis (Porsild) Yurtsev & Kozh. | Primula tschuktschorum | Primulaceae
|
| PRTSC | Primula tschuktschorum Kjellm. ssp. cairnesiana Porsild | Primula eximia | Primulaceae
|
| PRTSE | Primula tschuktschorum Kjellm. ssp. eximia (Greene) Porsild | Primula eximia | Primulaceae
|
| PRTSA | Primula tschuktschorum Kjellm. var. arctica (Koidzumi) Fern. | Primula eximia | Primulaceae
|
| PRTSB2 | Primula tschuktschorum Kjellm. var. beringensis Porsild | Primula tschuktschorum | Primulaceae
|
| PRTS | Primula tschuktschorum Kjellm. | chukchi primrose | Primulaceae
|
| PRVE2 | Primula veris L. | cowslip primrose | Primulaceae
|
| PRIMU | Primula L. | primrose | Primulaceae
|
| PRMA10 | Prinos macfadyenii Walp. | Ilex macfadyenii | Aquifoliaceae
|
| PRNI2 | Prinos nitidus Vahl | Ilex nitida | Aquifoliaceae
|
| PRCI | Prionopsis ciliata (Nutt.) Nutt. | Grindelia papposa | Asteraceae
|
| PRCA2 | Pristimera caribaea (Urban) A.C. Sm. | bejuco prieto | Celastraceae
|
| PRIST | Pristimera Miers | pristimera | Celastraceae
|
| PRAFG | Pritchardia affinis Becc. var. gracilis Becc. | Pritchardia affinis | Arecaceae
|
| PRAFH | Pritchardia affinis Becc. var. halophila Becc. | Pritchardia affinis | Arecaceae
|
| PRAFR | Pritchardia affinis Becc. var. rhopalocarpa Becc. | Pritchardia affinis | Arecaceae
|
| PRAF | Pritchardia affinis Becc. | Hawai'i pritchardia | Arecaceae
|
| PRAR2 | Pritchardia arecina Becc. | Maui pritchardia | Arecaceae
|