| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| POSA3 | Polygala sanguinea L. | purple milkwort | Polygalaceae
|
| POSC2 | Polygala scoparioides Chod. | broom milkwort | Polygalaceae
|
| POSEL | Polygala senega L. var. latifolia Torr. & Gray | Polygala senega | Polygalaceae
|
| POSE3 | Polygala senega L. | Seneca snakeroot | Polygalaceae
|
| POSE7 | Polygala setacea Michx. | coastalplain milkwort | Polygalaceae
|
| POSM3 | Polygala smallii R.R. Sm. & Ward | tiny milkwort | Polygalaceae
|
| POSUH2 | Polygala subspinosa S. Wats. var. heterorhyncha Barneby | Polygala heterorhyncha | Polygalaceae
|
| POSU2 | Polygala subspinosa S. Wats. | spiny milkwort | Polygalaceae
|
| POTE15 | Polygala tenuiloba Blake | slenderlobe milkwort | Polygalaceae
|
| POTW3 | Polygala tweedyi Britt. ex Wheelock | Polygala lindheimeri var. parvifolia | Polygalaceae
|
| POVEA | Polygala verticillata L. var. ambigua (Nutt.) Wood | Polygala ambigua | Polygalaceae
|
| POVED | Polygala verticillata L. var. dolichoptera Fern. | Polygala ambigua | Polygalaceae
|
| POVEI | Polygala verticillata L. var. isocycla Fern. | whorled milkwort | Polygalaceae
|
| POVES | Polygala verticillata L. var. sphenostachya Pennell | Polygala verticillata var. isocycla | Polygalaceae
|
| POVEV | Polygala verticillata L. var. verticillata | whorled milkwort | Polygalaceae
|
| POVE | Polygala verticillata L. | whorled milkwort | Polygalaceae
|
| POVI10 | Polygala violacea Aubl. | violet milkwort | Polygalaceae
|
| POVI15 | Polygala viridescens L. | Polygala sanguinea | Polygalaceae
|
| POVU2 | Polygala vulgaris L. | common milkwort | Polygalaceae
|
| POWA2 | Polygala watsonii Chod. | Watson's milkwort | Polygalaceae
|
| POLYG | Polygala L. | polygala | Polygalaceae
|
| POBIC | Polygonatum biflorum (Walt.) Ell. var. commutatum (J.A. & J.H. Schultes) Morong | smooth Solomon's seal | Liliaceae
|
| POBIH | Polygonatum biflorum (Walt.) Ell. var. hebetifolium R.R. Gates | smooth Solomon's seal | Liliaceae
|
| POBIM | Polygonatum biflorum (Walt.) Ell. var. melleum (Farw.) R. Ownbey | smooth Solomon's seal | Liliaceae
|
| POBIN | Polygonatum biflorum (Walt.) Ell. var. necopinum R. Ownbey | smooth Solomon's seal | Liliaceae
|
| POBI2 | Polygonatum biflorum (Walt.) Ell. | smooth Solomon's seal | Liliaceae
|
| POCA34 | Polygonatum canaliculatum auct. non (Muhl. ex Willd.) Pursh | Polygonatum biflorum var. commutatum | Liliaceae
|
| POCO6 | Polygonatum cobrense (Woot. & Standl.) R.R. Gates | McKittrick's Solomon's seal | Liliaceae
|
| POCO7 | Polygonatum commutatum (J.A. & J.H. Schultes) A. Dietr. | Polygonatum biflorum var. commutatum | Liliaceae
|
| POHI13 | Polygonatum hirsutum (Bosc ex Poir.) Pursh | broadleaf Solomon's seal | Liliaceae
|
| POLA7 | Polygonatum latifolium (Jacq.) Desf. | Polygonatum hirsutum | Liliaceae
|
| POME9 | Polygonatum melleum Farw. | Polygonatum biflorum var. melleum | Liliaceae
|
| POPU4 | Polygonatum pubescens (Willd.) Pursh | hairy Solomon's seal | Liliaceae
|
| POLYG2 | Polygonatum P. Mill. | Solomon's seal | Liliaceae
|
| POAM3 | Polygonella americana (Fisch. & C.A. Mey.) Small | southern jointweed | Polygonaceae
|
| POAR4 | Polygonella articulata (L.) Meisn. | coastal jointweed | Polygonaceae
|
| POBA5 | Polygonella basiramia (Small) Nesom & Bates | Florida jointweed | Polygonaceae
|
| POBR13 | Polygonella brachystachya Meisn. | Polygonella polygama | Polygonaceae
|
| POCIB | Polygonella ciliata Meisn. var. basiramia (Small) Horton | Polygonella basiramia | Polygonaceae
|
| POCI2 | Polygonella ciliata Meisn. | hairy jointweed | Polygonaceae
|
| POCR8 | Polygonella croomii Chapman | Polygonella polygama | Polygonaceae
|
| POFIR | Polygonella fimbriata (Ell.) Horton var. robusta (Small) Horton | Polygonella robusta | Polygonaceae
|
| POFI4 | Polygonella fimbriata (Ell.) Horton | sandhill jointweed | Polygonaceae
|
| POGR10 | Polygonella gracilis Meisn. | tall jointweed | Polygonaceae
|
| POMA14 | Polygonella macrophylla Small | largeleaf jointweed | Polygonaceae
|
| POMY2 | Polygonella myriophylla (Small) Horton | Small's jointweed | Polygonaceae
|
| POPA6 | Polygonella parksii Cory | Parks' jointweed | Polygonaceae
|
| POPOB | Polygonella polygama (Vent.) Engelm. & Gray var. brachystachya (Meisn.) Wunderlin | Polygonella polygama | Polygonaceae
|
| POPO2 | Polygonella polygama (Vent.) Engelm. & Gray | October flower | Polygonaceae
|
| PORO6 | Polygonella robusta (Small) Nesom & Bates | largeflower jointweed | Polygonaceae
|
| POLYG3 | Polygonella Michx. | jointweed | Polygonaceae
|
| POAC3 | Polygonum achoreum Blake | leathery knotweed | Polygonaceae
|
| POAC9 | Polygonum acre Kunth | Polygonum punctatum var. punctatum | Polygonaceae
|
| POAC6 | Polygonum acuminatum Kunth | tapertip smartweed | Polygonaceae
|
| POAE3 | Polygonum aequale Lindm. | Polygonum arenastrum | Polygonaceae
|
| POALG | Polygonum alaskanum W. Wight ex Hult�n var. glabrescens Hult�n | Polygonum alpinum | Polygonaceae
|
| POAL5 | Polygonum alaskanum W. Wight ex Hult�n | Polygonum alpinum | Polygonaceae
|
| POAL15 | Polygonum alatum Hamilton ex D. Don | Polygonum nepalense | Polygonaceae
|
| POAL10 | Polygonum allocarpum Blake | Polygonum ramosissimum var. ramosissimum | Polygonaceae
|
| POAL11 | Polygonum alpinum All. | Alaska wild rhubarb | Polygonaceae
|
| POAML | Polygonum amphibium L. ssp. laevimarginatum Hult�n | Polygonum amphibium var. stipulaceum | Polygonaceae
|
| POAMC | Polygonum amphibium L. var. coccineum (Muhl. ex Willd.) Farw. | Polygonum amphibium var. emersum | Polygonaceae
|
| POAME | Polygonum amphibium L. var. emersum Michx. | longroot smartweed | Polygonaceae
|
| POAMH | Polygonum amphibium L. var. hartwrightii (Gray) Bissell | Polygonum amphibium var. stipulaceum | Polygonaceae
|
| POAMS | Polygonum amphibium L. var. stipulaceum Coleman | water smartweed | Polygonaceae
|
| POAM8 | Polygonum amphibium L. | water knotweed | Polygonaceae
|
| POAR10 | Polygonum arenarium Waldst. & Kit. | European knotweed | Polygonaceae
|
| POAR11 | Polygonum arenastrum Jord. ex Boreau | oval-leaf knotweed | Polygonaceae
|
| POAR5 | Polygonum argyrocoleon Steud. ex Kunze | silversheath knotweed | Polygonaceae
|
| POARL3 | Polygonum arifolium L. var. lentiforme Fern. & Grisc. | Polygonum arifolium | Polygonaceae
|
| POARP | Polygonum arifolium L. var. pubescens (Keller) Fern. | Polygonum arifolium | Polygonaceae
|
| POAR6 | Polygonum arifolium L. | halberdleaf tearthumb | Polygonaceae
|
| POAR13 | Polygonum articulatum L. | Polygonella articulata | Polygonaceae
|
| POAT5 | Polygonum atlanticum (B.L. Robins.) Bickn. p.p. | Polygonum ramosissimum var. ramosissimum | Polygonaceae
|
| POAU4 | Polygonum aubertii Henry | Chinese fleecevine | Polygonaceae
|
| POAU2 | Polygonum austiniae Greene | Polygonum douglasii ssp. austiniae | Polygonaceae
|
| POAU5 | Polygonum autumnale Brenckle | Polygonum ramosissimum var. ramosissimum | Polygonaceae
|
| POAVA2 | Polygonum aviculare L. var. angustissimum Meisn. | Polygonum bellardii | Polygonaceae
|
| POAVA | Polygonum aviculare L. var. arenastrum (Jord. ex Boreau) Rouy | Polygonum arenastrum | Polygonaceae
|
| POAVB | Polygonum aviculare L. var. boreale Lange | Polygonum boreale | Polygonaceae
|
| POAVE | Polygonum aviculare L. var. erectum (L.) Roth ex Meisn. | Polygonum erectum | Polygonaceae
|
| POAVL | Polygonum aviculare L. var. littorale (Link) Mert. | Polygonum buxiforme | Polygonaceae
|
| POAVV | Polygonum aviculare L. var. vegetum Ledeb. | Polygonum aviculare | Polygonaceae
|
| POAV | Polygonum aviculare L. | prostrate knotweed | Polygonaceae
|
| POBA3 | Polygonum baldschuanicum Regel | Bukhara fleeceflower | Polygonaceae
|
| POBE | Polygonum bellardii All. | narrowleaf knotweed | Polygonaceae
|
| POBE8 | Polygonum bellardii auct. non All. | Polygonum patulum | Polygonaceae
|
| POBE7 | Polygonum beyrichianum Cham. & Schlecht. | Polygonum meisnerianum var. beyrichianum | Polygonaceae
|
| POBI11 | Polygonum bicorne Raf. | Polygonum pensylvanicum | Polygonaceae
|
| POBI4 | Polygonum bidwelliae S. Wats. | Bidwell's knotweed | Polygonaceae
|
| POBIP2 | Polygonum bistorta L. ssp. plumosum (Small) Hult�n | Polygonum bistorta var. plumosum | Polygonaceae
|
| POBIB2 | Polygonum bistorta L. var. bistorta | meadow bistort | Polygonaceae
|
| POBIP | Polygonum bistorta L. var. plumosum (Small) Boivin | meadow bistort | Polygonaceae
|
| POBI5 | Polygonum bistorta L. | meadow bistort | Polygonaceae
|
| POBIL | Polygonum bistortoides Pursh var. linearifolium (S. Wats.) Small | Polygonum bistortoides | Polygonaceae
|
| POBIO | Polygonum bistortoides Pursh var. oblongifolium (Meisn.) St. John | Polygonum bistortoides | Polygonaceae
|
| POBI6 | Polygonum bistortoides Pursh | American bistort | Polygonaceae
|
| POBO10 | Polygonum �bohemicum (J. Chrtek & Chrtkov�) Zika & Jacobson | Bohemian knotweed | Polygonaceae
|
| POBO3 | Polygonum bolanderi Brewer | Bolander's knotweed | Polygonaceae
|
| POBO5 | Polygonum boreale (Lange) Small | northern knotweed | Polygonaceae
|
| POBR3 | Polygonum braziliense K. Koch | Polygonum striatulum | Polygonaceae
|