| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| PLCA9 | Plumbago capensis Thunb. | Plumbago auriculata | Plumbaginaceae
|
| PLIN8 | Plumbago indica L. | whorled plantain | Plumbaginaceae
|
| PLLA5 | Plumbago larpentiae Lindl. | Ceratostigma plumbaginoides | Plumbaginaceae
|
| PLRO4 | Plumbago rosea L. | Plumbago indica | Plumbaginaceae
|
| PLSC4 | Plumbago scandens L. | doctorbush | Plumbaginaceae
|
| PLZE | Plumbago zeylanica L. | wild leadwort | Plumbaginaceae
|
| PLUMB | Plumbago L. | leadwort | Plumbaginaceae
|
| PLAL | Plumeria alba L. | nosegaytree | Apocynaceae
|
| PLKR3 | Plumeria krugii Urban | Plumeria obtusa var. obtusa | Apocynaceae
|
| PLOBO | Plumeria obtusa L. var. obtusa | Singapore graveyard flower | Apocynaceae
|
| PLOBS | Plumeria obtusa L. var. sericifolia (C. Wright) Woods. | Singapore graveyard flower | Apocynaceae
|
| PLOB2 | Plumeria obtusa L. | Singapore graveyard flower | Apocynaceae
|
| PLPO3 | Plumeria portoricensis Urban | Plumeria obtusa var. obtusa | Apocynaceae
|
| PLRU2 | Plumeria rubra L. | templetree | Apocynaceae
|
| PLUME | Plumeria L. | plumeria | Apocynaceae
|
| PLAM | Plummera ambigens Blake | Hymenoxys ambigens | Asteraceae
|
| PLFL2 | Plummera floribunda Gray | Hymenoxys microcephala | Asteraceae
|
| PNMA | Pneumaria maritima (L.) Hill | Mertensia maritima var. maritima | Boraginaceae
|
| PNHU | Pneumatopteris hudsoniana (Brack.) Holttum | Hudson's air fern | Thelypteridaceae
|
| PNSA | Pneumatopteris sandwicensis (Brack.) Holttum | Hawai'i air fern | Thelypteridaceae
|
| PNEUM | Pneumatopteris Nakai | air fern | Thelypteridaceae
|
| PNAF | Pneumonanthe affinis (Griseb.) W.A. Weber | Gentiana affinis | Gentianaceae
|
| PNAN | Pneumonanthe andrewsii (Griseb.) W.A. Weber | Gentiana andrewsii var. andrewsii | Gentianaceae
|
| PNCA | Pneumonanthe calycosa (Griseb.) Greene | Gentiana calycosa | Gentianaceae
|
| PNPA | Pneumonanthe parryi (Engelm.) Greene | Gentiana parryi | Gentianaceae
|
| POABA | Poa abbreviata R. Br. ssp. abbreviata | short bluegrass | Poaceae
|
| POABJ | Poa abbreviata R. Br. ssp. jordalii (Porsild) Hult�n | Poa abbreviata ssp. pattersonii | Poaceae
|
| POABM | Poa abbreviata R. Br. ssp. marshii Soreng | Marsh's bluegrass | Poaceae
|
| POABP | Poa abbreviata R. Br. ssp. pattersonii (Vasey) A.& D. L�ve & Kapoor | Patterson's bluegrass | Poaceae
|
| POABJ2 | Poa abbreviata R. Br. var. jordalii (Porsild) Boivin | Poa abbreviata ssp. pattersonii | Poaceae
|
| POAB | Poa abbreviata R. Br. | short bluegrass | Poaceae
|
| POAG | Poa agassizensis Boivin & D. L�ve | Poa pratensis ssp. pratensis | Poaceae
|
| POAL14 | Poa albescens A.S. Hitchc. | Poa fendleriana ssp. albescens | Poaceae
|
| POALC2 | Poa alpigena (Fries ex Blytt) Lindm. f. ssp. colpodea (Fries ex Blytt) Tzvelev | Poa pratensis ssp. colpodea | Poaceae
|
| POALC3 | Poa alpigena (Fries ex Blytt) Lindm. f. var. colpodea (Fries ex Blytt) Schol. | Poa pratensis ssp. colpodea | Poaceae
|
| POAL | Poa alpigena (Fries ex Blytt) Lindm. f. | Poa pratensis ssp. alpigena | Poaceae
|
| POALV2 | Poa alpina L. ssp. vivipara (L.) Arcang. | Poa alpina | Poaceae
|
| POALV | Poa alpina L. var. vivipara L. | Poa alpina | Poaceae
|
| POAL2 | Poa alpina L. | alpine bluegrass | Poaceae
|
| POAL3 | Poa alsodes Gray | grove bluegrass | Poaceae
|
| POAM16 | Poa amabilis sensu Walt. non L. | Eragrostis refracta | Poaceae
|
| POAM | Poa ampla Merr. | Poa secunda | Poaceae
|
| POAN6 | Poa angustifolia L. | Poa pratensis ssp. pratensis | Poaceae
|
| POANA | Poa annua L. var. aquatica Aschers. | Poa annua | Poaceae
|
| POANR | Poa annua L. var. reptans Hausskn. | Poa annua | Poaceae
|
| POAN | Poa annua L. | annual bluegrass | Poaceae
|
| POAP3 | Poa aperta Scribn. & Merr. | Poa arctica ssp. aperta | Poaceae
|
| POAR | Poa arachnifera Torr. | Texas bluegrass | Poaceae
|
| POARA | Poa arctica R. Br. ssp. aperta (Scribn. & Merr.) Soreng | arctic bluegrass | Poaceae
|
| POARA2 | Poa arctica R. Br. ssp. arctica | arctic bluegrass | Poaceae
|
| POARG | Poa arctica R. Br. ssp. grayana (Vasey) A.& D. L�ve & Kapoor | arctic bluegrass | Poaceae
|
| POARL4 | Poa arctica R. Br. ssp. lanata (Scribn. & Merr.) Soreng | arctic bluegrass | Poaceae
|
| POARL5 | Poa arctica R. Br. ssp. longiculmis Hult�n | Poa arctica ssp. arctica | Poaceae
|
| POARW2 | Poa arctica R. Br. ssp. williamsii (Nash) Hult�n | Poa arctica ssp. arctica | Poaceae
|
| POARG2 | Poa arctica R. Br. var. glabriflora Rosh. | Poa arctica ssp. arctica | Poaceae
|
| POARG3 | Poa arctica R. Br. var. grayana (Vasey) Dorn | Poa arctica ssp. grayana | Poaceae
|
| POARL2 | Poa arctica R. Br. var. lanata (Scribn. & Merr.) Boivin | Poa arctica ssp. lanata | Poaceae
|
| POARV | Poa arctica R. Br. var. vivipara Hook. | Poa arctica ssp. arctica | Poaceae
|
| POARV2 | Poa arctica R. Br. var. vivipara Hult�n | Poa arctica ssp. lanata | Poaceae
|
| POAR2 | Poa arctica R. Br. | arctic bluegrass | Poaceae
|
| POAR3 | Poa arida Vasey | plains bluegrass | Poaceae
|
| POAR21 | Poa arnowiae Soreng, ined. | Wasatch bluegrass | Poaceae
|
| POAT | Poa atropurpurea Scribn. | San Bernardino bluegrass | Poaceae
|
| POAU | Poa autumnalis Muhl. ex Ell. | autumn bluegrass | Poaceae
|
| POBI | Poa bigelovii Vasey & Scribn. | Bigelow's bluegrass | Poaceae
|
| POBOH | Poa bolanderi Vasey ssp. howellii (Vasey & Scribn.) Keck | Poa howellii | Poaceae
|
| POBOH2 | Poa bolanderi Vasey var. howellii (Vasey & Scribn.) M.E. Jones | Poa howellii | Poaceae
|
| POBO | Poa bolanderi Vasey | Bolander's bluegrass | Poaceae
|
| POBR | Poa brachyanthera Hult�n | Poa pseudoabbreviata | Poaceae
|
| POBR12 | Poa brachyglossa Piper | Poa secunda | Poaceae
|
| POBR11 | Poa brachyphylla J.A. Schultes | Poa cuspidata | Poaceae
|
| POBU4 | Poa buckleyana Nash | Poa secunda | Poaceae
|
| POBU | Poa bulbosa L. | bulbous bluegrass | Poaceae
|
| POCA | Poa canbyi (Scribn.) T.J. Howell | Poa secunda | Poaceae
|
| POCEA | Poa cenisia All. var. arctica (R. Br.) Richter | Poa arctica ssp. arctica | Poaceae
|
| POCH | Poa chaixii Vill. | broadleaf bluegrass | Poaceae
|
| POCH2 | Poa chapmaniana Scribn. | Chapman's bluegrass | Poaceae
|
| POCI3 | Poa cilianensis All. | Eragrostis cilianensis | Poaceae
|
| POCI4 | Poa ciliaris L. | Eragrostis ciliaris | Poaceae
|
| POCO | Poa compressa L. | Canada bluegrass | Poaceae
|
| POCO2 | Poa confinis Vasey | coastline bluegrass | Poaceae
|
| POCO17 | Poa confusa Rydb. | Poa secunda | Poaceae
|
| POCR7 | Poa crocata Michx. | Poa palustris | Poaceae
|
| POCU | Poa curta auct. non Rydb. | Poa arnowiae | Poaceae
|
| POCU2 | Poa curtifolia Scribn. | little mountain bluegrass | Poaceae
|
| POCUC4 | Poa cusickii Vasey ssp. cusickii | Cusick's bluegrass | Poaceae
|
| POCUE2 | Poa cusickii Vasey ssp. epilis (Scribn.) W.A. Weber | Cusick's bluegrass | Poaceae
|
| POCUP3 | Poa cusickii Vasey ssp. pallida Soreng | Cusick's bluegrass | Poaceae
|
| POCUP2 | Poa cusickii Vasey ssp. pubens Keck | Poa nematophylla | Poaceae
|
| POCUP4 | Poa cusickii Vasey ssp. purpurascens (Vasey) Soreng | Cusick's bluegrass | Poaceae
|
| POCUE | Poa cusickii Vasey var. epilis (Scribn.) C.L. Hitchc. | Poa cusickii ssp. epilis | Poaceae
|
| POCUP | Poa cusickii Vasey var. purpurascens (Vasey) C.L. Hitchc. | Poa cusickii ssp. purpurascens | Poaceae
|
| POCU3 | Poa cusickii Vasey | Cusick's bluegrass | Poaceae
|
| POCU4 | Poa cuspidata Nutt. | early bluegrass | Poaceae
|
| POCY4 | Poa cyperoides Thunb. | Cladoraphis cyperoides | Poaceae
|
| PODE6 | Poa debilis Torr. | Poa saltuensis | Poaceae
|
| PODI11 | Poa distans Jacq. | Puccinellia distans ssp. distans | Poaceae
|
| PODOM | Poa douglasii Nees ssp. macrantha (Vasey) Keck | Poa macrantha | Poaceae
|
| PODOM3 | Poa douglasii Nees var. macrantha (Vasey) Boivin | Poa macrantha | Poaceae
|
| PODO | Poa douglasii Nees | Douglas' bluegrass | Poaceae
|
| POEM | Poa eminens J. Presl | largeflower speargrass | Poaceae
|