| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| POPRA2 | Poa pratensis L. ssp. angustifolia (L.) Lej. | Poa pratensis ssp. pratensis | Poaceae
|
| POPRC | Poa pratensis L. ssp. colpodea (Fries ex Blytt) Tzvelev | Kentucky bluegrass | Poaceae
|
| POPRI2 | Poa pratensis L. ssp. irrigata (Lindm.) Lindb. f. | spreading bluegrass | Poaceae
|
| POPRP2 | Poa pratensis L. ssp. pratensis | Kentucky bluegrass | Poaceae
|
| POPRR | Poa pratensis L. ssp. rigens (Hartman) Tzvelev | Poa pratensis ssp. irrigata | Poaceae
|
| POPRS | Poa pratensis L. ssp. subcaerulea (Sm.) Hiitonen | Poa pratensis ssp. irrigata | Poaceae
|
| POPRA5 | Poa pratensis L. var. alpigena Fries ex Blytt | Poa pratensis ssp. alpigena | Poaceae
|
| POPRA3 | Poa pratensis L. var. angustifolia (L.) Gaudin | Poa pratensis ssp. pratensis | Poaceae
|
| POPRC2 | Poa pratensis L. var. colpodea (Fries ex Blytt) Soreng | Poa pratensis ssp. colpodea | Poaceae
|
| POPRD | Poa pratensis L. var. domestica Laestad. | Poa pratensis ssp. pratensis | Poaceae
|
| POPRG | Poa pratensis L. var. gelida (Roemer & J.A. Schultes) B�cher | Poa pratensis ssp. pratensis | Poaceae
|
| POPRI | Poa pratensis L. var. iantha Wahlenb. | Poa pratensis ssp. pratensis | Poaceae
|
| POPRR2 | Poa pratensis L. var. rigens (Hartman) Wahlenb. | Poa pratensis ssp. irrigata | Poaceae
|
| POPRV | Poa pratensis L. var. vivipara (Malmgr.) Boivin | Poa pratensis ssp. colpodea | Poaceae
|
| POPR | Poa pratensis L. | Kentucky bluegrass | Poaceae
|
| POPR2 | Poa pringlei Scribn. | Pringle's bluegrass | Poaceae
|
| POPR16 | Poa prolifera Sw. | Eragrostis prolifera | Poaceae
|
| POPS | Poa pseudoabbreviata Rosh. | shortcoal bluegrass | Poaceae
|
| POPS3 | Poa pseudopratensis Scribn. & Rydb. | Poa arida | Poaceae
|
| PORE | Poa reflexa Vasey & Scribn. ex Vasey | nodding bluegrass | Poaceae
|
| PORE14 | Poa refracta Muhl. | Eragrostis refracta | Poaceae
|
| PORE15 | Poa reptans Michx. | Neeragrostis reptans | Poaceae
|
| PORH | Poa rhizomata A.S. Hitchc. | rhizome bluegrass | Poaceae
|
| PORI5 | Poa rigida L. | Desmazeria rigida | Poaceae
|
| PORU10 | Poa rupicola Nash ex Rydb. | Poa glauca ssp. rupicola | Poaceae
|
| POSAM2 | Poa saltuensis Fern. & Wieg. var. marcida (A.S. Hitchc.) Boivin | Poa marcida | Poaceae
|
| POSAM | Poa saltuensis Fern. & Wieg. var. microlepis Fern. & Wieg. | Poa saltuensis | Poaceae
|
| POSA | Poa saltuensis Fern. & Wieg. | oldpasture bluegrass | Poaceae
|
| POSA12 | Poa sandbergii Vasey | Poa secunda | Poaceae
|
| POSA2 | Poa sandvicensis (Reichart) A.S. Hitchc. | Hawai'i bluegrass | Poaceae
|
| POSC | Poa scabrella (Thurb.) Benth. ex Vasey | Poa secunda | Poaceae
|
| POSC14 | Poa scopulorum Butters & Abbe | Poa glauca ssp. glauca | Poaceae
|
| POSEJ | Poa secunda J. Presl ssp. juncifolia (Scribn.) Soreng | Poa secunda | Poaceae
|
| POSEE | Poa secunda J. Presl var. elongata (Vasey) Dorn | Poa secunda | Poaceae
|
| POSEI2 | Poa secunda J. Presl var. incurva (Scribn. & Williams) Beetle | Poa secunda | Poaceae
|
| POSES3 | Poa secunda J. Presl var. stenophylla (Vasey) Beetle | Poa secunda | Poaceae
|
| POSE | Poa secunda J. Presl | Sandberg bluegrass | Poaceae
|
| POSI6 | Poa sierrae J.T. Howell | Sierra bluegrass | Poaceae
|
| POSI | Poa siphonoglossa Hack. | Kauai bluegrass | Poaceae
|
| POSP8 | Poa spectabilis Pursh | Eragrostis spectabilis | Poaceae
|
| POST11 | Poa stebbinsii Soreng | Stebbin's bluegrass | Poaceae
|
| POSTS | Poa stenantha Trin. var. sandbergii (Vasey) Boivin | Poa secunda | Poaceae
|
| POST | Poa stenantha Trin. | northern bluegrass | Poaceae
|
| POST6 | Poa strictiramea A.S. Hitchc. | Big Bend bluegrass | Poaceae
|
| POSU | Poa subcaerulea Sm. | Poa pratensis ssp. irrigata | Poaceae
|
| POSU10 | Poa suksdorfii (Beal) Vasey ex Piper | western bluegrass | Poaceae
|
| POSU18 | Poa supina Schrader | bluegrass | Poaceae
|
| POSY | Poa sylvestris Gray | woodland bluegrass | Poaceae
|
| POTE10 | Poa tef Zuccagni | Eragrostis tef | Poaceae
|
| POTE11 | Poa tenella L. | Eragrostis tenella | Poaceae
|
| POTE5 | Poa tenerrima Scribn. | delicate bluegrass | Poaceae
|
| POTE16 | Poa tenuifolia A. Rich. | Eragrostis tenuifolia | Poaceae
|
| POTO6 | Poa �tormentuosa Butters & Abbe | Poa glauca ssp. glauca | Poaceae
|
| POTR | Poa tracyi Vasey | Tracy's bluegrass | Poaceae
|
| POTR18 | Poa trichodes Nutt. | Eragrostis trichodes | Poaceae
|
| POTR19 | Poa triflora Gilib. | Poa palustris | Poaceae
|
| POTR2 | Poa trivialis L. | rough bluegrass | Poaceae
|
| POTU | Poa turneri Scribn. | Poa macrocalyx | Poaceae
|
| POUN | Poa unilateralis Scribn. | San Francisco bluegrass | Poaceae
|
| POVA | Poa vaseyochloa Scribn. | Poa leibergii | Poaceae
|
| POVI14 | Poa virginica Zucc. ex Roemer | Eragrostis scaligera | Poaceae
|
| POVI16 | Poa vivipara (L.) Willd. | Poa alpina | Poaceae
|
| POWH2 | Poa wheeleri Vasey | Wheeler's bluegrass | Poaceae
|
| POWI2 | Poa williamsii Nash | Poa arctica ssp. arctica | Poaceae
|
| POWO | Poa wolfii Scribn. | Wolf's bluegrass | Poaceae
|
| POA | Poa L. | bluegrass | Poaceae
|
| POBI13 | Pocilla biloba (L.) W.A. Weber | Veronica biloba | Scrophulariaceae
|
| POPE21 | Pocilla persica (Poir.) Fourr. | Veronica persica | Scrophulariaceae
|
| POPO21 | Pocilla polita (Fries) Fourr. | Veronica polita | Scrophulariaceae
|
| POAE | Podagrostis aequivalvis (Trin.) Scribn. & Merr. | Agrostis aequivalvis | Poaceae
|
| POHU | Podagrostis humilis (Vasey) Bj�rkman | Agrostis humilis | Poaceae
|
| POTH3 | Podagrostis thurberiana (A.S. Hitchc.) Hult�n | Agrostis humilis | Poaceae
|
| POEA | Podistera eastwoodiae (Coult. & Rose) Mathias & Constance | Eastwood's podistera | Apiaceae
|
| POMA18 | Podistera macounii (Coult. & Rose) Mathias & Constance | Macoun's woodroot | Apiaceae
|
| PONE4 | Podistera nevadensis (Gray) S. Wats. | Nevada podistera | Apiaceae
|
| POYU | Podistera yukonensis Mathias & Constance | Yukon podistera | Apiaceae
|
| PODIS | Podistera S. Wats. | podistera | Apiaceae
|
| POCO3 | Podocarpus coriaceus L.C. Rich. | yucca plum pine | Podocarpaceae
|
| PODA2 | Podocarpus dacrydioides A. Rich. | Dacrycarpus dacrydioides | Podocarpaceae
|
| POMAM | Podocarpus macrophyllus (Thunb.) Sweet var. maki Endl. | yew plum pine | Podocarpaceae
|
| POMA32 | Podocarpus macrophyllus (Thunb.) Sweet | yew plum pine | Podocarpaceae
|
| POTO4 | Podocarpus totara G. Bennett ex D. Don | totara | Podocarpaceae
|
| PODOC | Podocarpus L'H�r. ex Pers. | plum pine | Podocarpaceae
|
| POEM4 | Podophyllum emodi Wallich ex Hook. f. & Thomson | Podophyllum hexandrum | Berberidaceae
|
| POHE16 | Podophyllum hexandrum Royle | Himalayan mayapple | Berberidaceae
|
| POPE | Podophyllum peltatum L. | mayapple | Berberidaceae
|
| PODOP | Podophyllum L. | mayapple | Berberidaceae
|
| POLA12 | Podospermum laciniatum (L.) DC. | Scorzonera laciniata | Asteraceae
|
| POAB3 | Podostemum abrotanoides Nutt. | Podostemum ceratophyllum | Podostemaceae
|
| POCE3 | Podostemum ceratophyllum Michx. | hornleaf riverweed | Podostemaceae
|
| PODOS | Podostemum Michx. | riverweed | Podostemaceae
|
| POPE17 | Podostigma pedicellata (Walt.) Vail | Asclepias pedicellata | Asclepiadaceae
|
| PORI4 | Podranea ricasoliana (Tanfani) Sprague | Zimbabwe creeper | Bignoniaceae
|
| PODRA | Podranea Sprague | podranea | Bignoniaceae
|
| POCE8 | Poeltinula cerebrina (DC.) Hafellner | | Rhizocarpaceae
|
| POELT | Poeltinula Hafellner | poeltinula | Rhizocarpaceae
|
| POAB2 | Pogogyne abramsii J.T. Howell | San Diego mesamint | Lamiaceae
|
| POCL2 | Pogogyne clareana J.T. Howell | Santa Lucia mint | Lamiaceae
|
| PODOD2 | Pogogyne douglasii Benth. ssp. douglasii | Douglas' mesamint | Lamiaceae
|
| PODOM5 | Pogogyne douglasii Benth. ssp. minor J.T. Howell | Douglas' mesamint | Lamiaceae
|
| PODOP2 | Pogogyne douglasii Benth. ssp. parviflora (Benth.) J.T. Howell | Douglas' mesamint | Lamiaceae
|