| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| POVA7 | Porophyllum vaseyi Greene | Porophyllum gracile | Asteraceae
|
| POROP | Porophyllum Adans. | poreleaf | Asteraceae
|
| POBI16 | Porothamnium bigelovii (Sull.) Fleisch. in Broth. | Porotrichum bigelovii | Thamnobryaceae
|
| POBI15 | Porotrichum bigelovii (Sull.) Kindb. | Bigelow's porotrichum moss | Thamnobryaceae
|
| PONE16 | Porotrichum neckeroides (Hook.) Williams | Thamnobryum neckeroides | Thamnobryaceae
|
| PONE17 | Porotrichum neomexicanum (Card.) Wagn. | Metaneckera menziesii | Neckeraceae
|
| POVA12 | Porotrichum vancouveriense (Kindb. in Mac.) Crum | Vancouver porotrichum moss | Thamnobryaceae
|
| POROT | Porotrichum (Brid.) Hampe | porotrichum moss | Thamnobryaceae
|
| POAL17 | Porpidia albocaerulescens (Wulfen) Hertel & Knoph | | Porpidiaceae
|
| POCA39 | Porpidia calcarea Gowan | | Porpidiaceae
|
| POCA40 | Porpidia carlottiana Gowan | | Porpidiaceae
|
| POCI5 | Porpidia cinereoatra (Ach.) Hertel & Knoph | | Porpidiaceae
|
| POCO33 | Porpidia contrapoenda (Arnold) Knoph & Hertel | | Porpidiaceae
|
| POCR13 | Porpidia crustulata (Ach.) Hertel & Knoph | | Porpidiaceae
|
| PODI12 | Porpidia diversa (Lowe) Gowan | | Porpidiaceae
|
| POFL15 | Porpidia flavicunda (Ach.) Gowan | Porpidia flavocaerulescens | Porpidiaceae
|
| POFL60 | Porpidia flavocaerulescens (Hornem.) Hertel & A. J. Schwab | | Porpidiaceae
|
| POGL16 | Porpidia glaucophaea (Korber) Hertel & Knoph | | Porpidiaceae
|
| POGR22 | Porpidia grisea Gowan | | Porpidiaceae
|
| POHE15 | Porpidia herteliana Gowan | | Porpidiaceae
|
| POLO15 | Porpidia lowiana Gowan | | Porpidiaceae
|
| POMA60 | Porpidia macrocarpa (DC.) Hertel & A. J. Schwab | | Porpidiaceae
|
| POME14 | Porpidia melinodes (Korber) Gowan & Ahti | | Porpidiaceae
|
| PONI8 | Porpidia nigrocruenta (Anzi) Diederich & Serus. | Porpidia macrocarpa | Porpidiaceae
|
| POOC7 | Porpidia ochrolemma (Vainio) Brodo & R. Sant. | | Porpidiaceae
|
| POPL7 | Porpidia platycarpopides (Bagl.) Hertel | | Porpidiaceae
|
| POPS6 | Porpidia pseudomelinodes A. J. Schwab | Porpidia ochrolemma | Porpidiaceae
|
| POSO2 | Porpidia soredizodes (Lamy ex Nyl.) J. R. Laundon | | Porpidiaceae
|
| POSP6 | Porpidia speirea (Ach.) Krempelh. | | Porpidiaceae
|
| POSU14 | Porpidia subsimplex (H. Magn.) | | Porpidiaceae
|
| POSU15 | Porpidia superba (Korber) Hertel & Knoph | | Porpidiaceae
|
| POTA7 | Porpidia tahawasiana Gowan | | Porpidiaceae
|
| POTH8 | Porpidia thomsonii Gowan | | Porpidiaceae
|
| POTU3 | Porpidia tuberculosa (Sm.) Hertel & Knoph | | Porpidiaceae
|
| POZE2 | Porpidia zeoroides (Anzi) Knoph & Hertel | | Porpidiaceae
|
| PORPI2 | Porpidia Korber | porpidia | Porpidiaceae
|
| POGRG4 | Porsildia groenlandica (Retz.) A.& D. L�ve ssp. glabra (Michx.) A.& D. L�ve | Minuartia glabra | Caryophyllaceae
|
| POGR18 | Porsildia groenlandica (Retz.) A.& D. L�ve | Minuartia groenlandica | Caryophyllaceae
|
| POST5 | Porteranthus stipulatus (Muhl. ex Willd.) Britt. | Indian physic | Rosaceae
|
| POTR11 | Porteranthus trifoliatus (L.) Britt. | Bowman's root | Rosaceae
|
| PORTE2 | Porteranthus Britt. ex Small | porteranthus | Rosaceae
|
| POCA15 | Porterella carnosula (Hook. & Arn.) Torr. | fleshy porterella | Campanulaceae
|
| PORTE | Porterella Torr. | porterella | Campanulaceae
|
| POAM13 | Portulaca amilis Speg. | Paraguayan purslane | Portulacaceae
|
| POBI14 | Portulaca biloba Urban | Cuban purslane | Portulacaceae
|
| POCA22 | Portulaca caulerpoides Britt. & Wilson ex Britt. | Puerto Rico purslane | Portulacaceae
|
| POCO19 | Portulaca coronata Small | Portulaca umbraticola ssp. coronata | Portulacaceae
|
| POCY2 | Portulaca cyanosperma Engl. | Portulaca pilosa | Portulacaceae
|
| POGR7 | Portulaca grandiflora Hook. | rose moss | Portulacaceae
|
| POHA5 | Portulaca halimoides L. | silkcotton purslane | Portulacaceae
|
| POHA6 | Portulaca hawaiiensis O. Deg. | Portulaca villosa | Portulacaceae
|
| POLA23 | Portulaca lanceolata Engelm. | Portulaca umbraticola ssp. umbraticola | Portulacaceae
|
| POLU2 | Portulaca lutea Soland. ex G. Forst. | native yellow purslane | Portulacaceae
|
| POMO15 | Portulaca molokiniensis Hobdy | 'ihi | Portulacaceae
|
| POMU2 | Portulaca mundula I.M. Johnston | Portulaca pilosa | Portulacaceae
|
| PONE6 | Portulaca neglecta Mackenzie & Bush | Portulaca oleracea | Portulacaceae
|
| POOLG | Portulaca oleracea L. ssp. granulatostellulata (Poelln.) Danin & Baker | Portulaca oleracea | Portulacaceae
|
| POOLI | Portulaca oleracea L. ssp. impolita Danin & Baker | Portulaca oleracea | Portulacaceae
|
| POOLN | Portulaca oleracea L. ssp. nicaraguensis Danin & Baker | Portulaca oleracea | Portulacaceae
|
| POOLN2 | Portulaca oleracea L. ssp. nitida Danin & Baker | Portulaca oleracea | Portulacaceae
|
| POOLP | Portulaca oleracea L. ssp. papillatostellulata Danin & Baker | Portulaca oleracea | Portulacaceae
|
| POOLS | Portulaca oleracea L. ssp. stellata Danin & Baker | Portulaca oleracea | Portulacaceae
|
| POOL | Portulaca oleracea L. | little hogweed | Portulacaceae
|
| POPA21 | Portulaca paniculata Jacq. | Talinum paniculatum var. paniculatum | Portulacaceae
|
| POPA12 | Portulaca parvula Gray | Portulaca halimoides | Portulacaceae
|
| POPH2 | Portulaca phaeosperma Urban | Portulaca rubricaulis | Portulacaceae
|
| POPI3 | Portulaca pilosa L. | kiss me quick | Portulacaceae
|
| POPO15 | Portulaca poliosperma Urban | Portulaca teretifolia | Portulacaceae
|
| POPO19 | Portulaca portulacastrum L. | Sesuvium portulacastrum | Aizoaceae
|
| POQU2 | Portulaca quadrifida L. | chickenweed | Portulacaceae
|
| PORE4 | Portulaca retusa Engelm. | Portulaca oleracea | Portulacaceae
|
| PORU14 | Portulaca rubricaulis Kunth | redstem purslane | Portulacaceae
|
| POSC9 | Portulaca sclerocarpa Gray | 'ihi makole | Portulacaceae
|
| POSM | Portulaca smallii P. Wilson | Small's purslane | Portulacaceae
|
| POSU3 | Portulaca suffrutescens Engelm. | shrubby purslane | Portulacaceae
|
| POTE7 | Portulaca teretifolia Kunth | roundleaf purslane | Portulacaceae
|
| POUMC | Portulaca umbraticola Kunth ssp. coronata (Small) Matthews & Ketron | wingpod purslane | Portulacaceae
|
| POUML | Portulaca umbraticola Kunth ssp. lanceolata (Engelm.) Matthews & Ketron | Portulaca umbraticola ssp. umbraticola | Portulacaceae
|
| POUMU | Portulaca umbraticola Kunth ssp. umbraticola | wingpod purslane | Portulacaceae
|
| POUM | Portulaca umbraticola Kunth | wingpod purslane | Portulacaceae
|
| POVI8 | Portulaca villosa Cham. | hairy purslane | Portulacaceae
|
| PORTU | Portulaca L. | purslane | Portulacaceae
|
| POAF | Portulacaria afra (L.) Jacq. | elephant bush | Portulacaceae
|
| PORTU2 | Portulacaria Jacq. | portulacaria | Portulacaceae
|
| POOC3 | Posidonia oceania (L.) Delile | Mediterranean tapeweed | Posidoniaceae
|
| POSID | Posidonia Koenig | posidonia | Posidoniaceae
|
| POALT3 | Potamogeton alpinus Balbis ssp. tenuifolius (Raf.) Hult�n | Potamogeton alpinus | Potamogetonaceae
|
| POALS2 | Potamogeton alpinus Balbis var. subellipticus (Fern.) Ogden | Potamogeton alpinus | Potamogetonaceae
|
| POALT2 | Potamogeton alpinus Balbis var. tenuifolius (Raf.) Ogden | Potamogeton alpinus | Potamogetonaceae
|
| POAL8 | Potamogeton alpinus Balbis | alpine pondweed | Potamogetonaceae
|
| POAM11 | Potamogeton americanus Cham. & Schlecht. | Potamogeton nodosus | Potamogetonaceae
|
| POAM10 | Potamogeton amplexicaulis Kar. | Potamogeton perfoliatus | Potamogetonaceae
|
| POAM5 | Potamogeton amplifolius Tuckerman | largeleaf pondweed | Potamogetonaceae
|
| POAN10 | Potamogeton angustifolius Bercht. & K. Presl | Potamogeton illinoensis | Potamogetonaceae
|
| POAR9 | Potamogeton �argutulus Hagstr. | | Potamogetonaceae
|
| POBEA | Potamogeton berchtoldii Fieber var. acuminatus Fieber | Potamogeton pusillus ssp. tenuissimus | Potamogetonaceae
|
| POBEC | Potamogeton berchtoldii Fieber var. colpophilus (Fern.) Fern. | Potamogeton pusillus ssp. tenuissimus | Potamogetonaceae
|
| POBEL | Potamogeton berchtoldii Fieber var. lacunatus (Hagstr.) Fern. | Potamogeton pusillus ssp. tenuissimus | Potamogetonaceae
|
| POBEM | Potamogeton berchtoldii Fieber var. mucronatus Fieber | Potamogeton pusillus ssp. tenuissimus | Potamogetonaceae
|
| POBEP | Potamogeton berchtoldii Fieber var. polyphyllus (Morong) Fern. | Potamogeton pusillus ssp. tenuissimus | Potamogetonaceae
|
| POBET | Potamogeton berchtoldii Fieber var. tenuissimus (Mert. & Koch) Fern. | Potamogeton pusillus ssp. tenuissimus | Potamogetonaceae
|