| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| POAB4 | Polygala aboriginum Small | Polygala polygama | Polygalaceae
|
| POACI2 | Polygala acanthoclada Gray var. intricata Eastw. | Polygala intermontana | Polygalaceae
|
| POAC2 | Polygala acanthoclada Gray | desert polygala | Polygalaceae
|
| POALS3 | Polygala alba Nutt. var. suspecta S. Wats. | Polygala alba | Polygalaceae
|
| POAL4 | Polygala alba Nutt. | white milkwort | Polygalaceae
|
| POAM9 | Polygala ambigua Nutt. | whorled milkwort | Polygalaceae
|
| POAR12 | Polygala arenicola Small, non Guerke | Polygala smallii | Polygalaceae
|
| POBAB | Polygala balduinii Nutt. var. balduinii | Baldwin's milkwort | Polygalaceae
|
| POBAC | Polygala balduinii Nutt. var. carteri (Small) R.R. Sm. & Ward | Carter's milkwort | Polygalaceae
|
| POBAC4 | Polygala balduinii Nutt. var. chlorgena Torr. & Gray | Polygala ramosa | Polygalaceae
|
| POBA4 | Polygala balduinii Nutt. | Baldwin's milkwort | Polygalaceae
|
| POBA | Polygala barbeyana Chod. | blue milkwort | Polygalaceae
|
| POBOB3 | Polygala boykinii Nutt. var. boykinii | Boykin's milkwort | Polygalaceae
|
| POBOS | Polygala boykinii Nutt. var. sparsifolia Wheelock | Boykin's milkwort | Polygalaceae
|
| POBOS2 | Polygala boykinii Nutt. var. suborbicularis R.W. Long | Polygala boykinii var. boykinii | Polygalaceae
|
| POBO4 | Polygala boykinii Nutt. | Boykin's milkwort | Polygalaceae
|
| POBR2 | Polygala brevifolia Nutt. | littleleaf milkwort | Polygalaceae
|
| POBR15 | Polygala brizoides St.-Hil. | Polygala violacea | Polygalaceae
|
| POCA5 | Polygala californica Nutt. | California milkwort | Polygalaceae
|
| POCH5 | Polygala chapmanii Torr. & Gray | Chapman's milkwort | Polygalaceae
|
| POCO20 | Polygala corallicola Small | Polygala grandiflora var. angustifolia | Polygalaceae
|
| POCOF2 | Polygala cornuta Kellogg ssp. fishiae (Parry) Munz | Polygala cornuta var. fishiae | Polygalaceae
|
| POCOP2 | Polygala cornuta Kellogg ssp. pollardii (Munz) Munz | Polygala cornuta var. fishiae | Polygalaceae
|
| POCOC | Polygala cornuta Kellogg var. cornuta | Sierra milkwort | Polygalaceae
|
| POCOF | Polygala cornuta Kellogg var. fishiae (Parry) Jepson | Sierra milkwort | Polygalaceae
|
| POCOP3 | Polygala cornuta Kellogg var. pollardii Munz | Polygala cornuta var. fishiae | Polygalaceae
|
| POCO4 | Polygala cornuta Kellogg | Sierra milkwort | Polygalaceae
|
| POCO5 | Polygala cowellii (Britt.) Blake | violet tree | Polygalaceae
|
| POCR11 | Polygala crenata C.W. James | scalloped milkwort | Polygalaceae
|
| POCR14 | Polygala crotalarioides Buch.-Ham. ex DC. | polygala | Polygalaceae
|
| POCR5 | Polygala crucianelloides DC. | Caribbean milkwort | Polygalaceae
|
| POCRA | Polygala cruciata L. var. aquilonia Fern. & Schub. | drumheads | Polygalaceae
|
| POCRC | Polygala cruciata L. var. cruciata | drumheads | Polygalaceae
|
| POCRC3 | Polygala cruciata L. var. cuspidata (Hook. & Arn.) Wood | Polygala cruciata var. cruciata | Polygalaceae
|
| POCR | Polygala cruciata L. | drumheads | Polygalaceae
|
| POCU9 | Polygala cumulicola Small | Polygala grandiflora var. grandiflora | Polygalaceae
|
| POCU5 | Polygala curtissii Gray | Curtiss' milkwort | Polygalaceae
|
| POCY | Polygala cymosa Walt. | tall pinebarren milkwort | Polygalaceae
|
| POEU4 | Polygala eucosma S.F. Blake | | Polygalaceae
|
| POFI9 | Polygala fishiae Parry | Polygala cornuta var. fishiae | Polygalaceae
|
| POFL11 | Polygala flagellaris Small | Polygala boykinii var. sparsifolia | Polygalaceae
|
| POGL5 | Polygala glandulosa Kunth | glandular milkwort | Polygalaceae
|
| POGL6 | Polygala glochidiata Kunth | tropical milkwort | Polygalaceae
|
| POGRA | Polygala grandiflora Walt. var. angustifolia Torr. & Gray | showy milkwort | Polygalaceae
|
| POGRG2 | Polygala grandiflora Walt. var. grandiflora | showy milkwort | Polygalaceae
|
| POGRL | Polygala grandiflora Walt. var. leiodes Blake | Polygala grandiflora var. angustifolia | Polygalaceae
|
| POGR11 | Polygala grandiflora Walt. | showy milkwort | Polygalaceae
|
| POHA7 | Polygala harperi Small | Polygala mariana | Polygalaceae
|
| POHE6 | Polygala hecatantha Urban | West Indian milkwort | Polygalaceae
|
| POHE | Polygala hemipterocarpa Gray | winged milkwort | Polygalaceae
|
| POHE7 | Polygala heterorhyncha (Barneby) T. Wendt | beaked spiny polygala | Polygalaceae
|
| POHO3 | Polygala hookeri Torr. & Gray | Hooker's milkwort | Polygalaceae
|
| POIN4 | Polygala incarnata L. | procession flower | Polygalaceae
|
| POIN12 | Polygala intermontana T. Wendt | Intermountain milkwort | Polygalaceae
|
| POLE4 | Polygala leptocaulis Torr. & Gray | swamp milkwort | Polygalaceae
|
| POLE7 | Polygala leptostachys Shuttlw. ex Gray | Georgia milkwort | Polygalaceae
|
| POLE8 | Polygala lewtonii Small | Lewton's milkwort | Polygalaceae
|
| POLIL | Polygala lindheimeri Gray var. lindheimeri | shrubby milkwort | Polygalaceae
|
| POLIP | Polygala lindheimeri Gray var. parvifolia Wheelock | shrubby milkwort | Polygalaceae
|
| POLI | Polygala lindheimeri Gray | shrubby milkwort | Polygalaceae
|
| POLO11 | Polygala longa Blake | Polygala barbeyana | Polygalaceae
|
| POLO7 | Polygala longicaulis Kunth | longstem milkwort | Polygalaceae
|
| POLU | Polygala lutea L. | orange milkwort | Polygalaceae
|
| POMA7 | Polygala macradenia Gray | glandleaf milkwort | Polygalaceae
|
| POMA17 | Polygala maravillasensis Correll | Maravillas milkwort | Polygalaceae
|
| POMA8 | Polygala mariana P. Mill. | Maryland milkwort | Polygalaceae
|
| POMI13 | Polygala miamiensis Small ex Blake | Polygala grandiflora var. angustifolia | Polygalaceae
|
| POMI15 | Polygala minutifolia auct. non Rose | Polygala nudata | Polygalaceae
|
| POMOB | Polygala monticola Kunth var. brizoides (St.-Hil.) Steyermark | Polygala violacea | Polygalaceae
|
| PONA2 | Polygala nana (Michx.) DC. | candyroot | Polygalaceae
|
| PONIG | Polygala nitida Brandeg. var. goliadensis T. Wendt | shining milkwort | Polygalaceae
|
| PONIT | Polygala nitida Brandeg. var. tamaulipana T. Wendt | shining milkwort | Polygalaceae
|
| PONI4 | Polygala nitida Brandeg. | shining milkwort | Polygalaceae
|
| PONO4 | Polygala northropiana R.N. Banerjee | Polygala boykinii var. sparsifolia | Polygalaceae
|
| PONU5 | Polygala nudata Brandeg. | smallflower milkwort | Polygalaceae
|
| PONU2 | Polygala nuttallii Torr. & Gray | Nuttall's milkwort | Polygalaceae
|
| POOB | Polygala obscura Benth. | velvetseed milkwort | Polygalaceae
|
| POOR3 | Polygala orthotricha Blake | Polygala obscura | Polygalaceae
|
| POOV | Polygala ovatifolia Gray | eggleaf milkwort | Polygalaceae
|
| POPA17 | Polygala palmeri S. Wats. | Palmer's milkwort | Polygalaceae
|
| POPA18 | Polygala paniculata L. | orosne | Polygalaceae
|
| POPA5 | Polygala paucifolia Willd. | gaywings | Polygalaceae
|
| POPEP | Polygala penaea L. ssp. portoricensis (Britt.) Gillis | crevajosa | Polygalaceae
|
| POPE13 | Polygala penaea L. | crevajosa | Polygalaceae
|
| POPI | Polygala piliophora Blake | Huachuca Mountain milkwort | Polygalaceae
|
| POPL10 | Polygala planellasii Molinet & Maz | | Polygalaceae
|
| POPOO | Polygala polygama Walt. var. obtusata Chod. | Polygala polygama | Polygalaceae
|
| POPOR | Polygala polygama Walt. var. ramulosa Farw. | Polygala polygama | Polygalaceae
|
| POPO | Polygala polygama Walt. | racemed milkwort | Polygalaceae
|
| POPO13 | Polygala portoricensis (Britt.) Blake | Polygala penaea ssp. portoricensis | Polygalaceae
|
| POPR11 | Polygala praetervisa Chod. | Polygala boykinii var. sparsifolia | Polygalaceae
|
| POPR12 | Polygala pretzii Pennell | Polygala verticillata var. verticillata | Polygalaceae
|
| PORA8 | Polygala racemosa Blake | Polygala barbeyana | Polygalaceae
|
| PORA2 | Polygala ramosa Ell. | low pinebarren milkwort | Polygalaceae
|
| PORA7 | Polygala ramosior (Nash) Small | Polygala cruciata var. cruciata | Polygalaceae
|
| PORE8 | Polygala rectipilis Blake | New Mexico milkwort | Polygalaceae
|
| PORE13 | Polygala reducta Blake | Polygala barbeyana | Polygalaceae
|
| PORIM | Polygala rimulicola Steyermark var. mescalerorum T. Wendt & T.K. Todsen | Mescalero milkwort | Polygalaceae
|
| PORIR | Polygala rimulicola Steyermark var. rimulicola | Steyermark's milkwort | Polygalaceae
|
| PORI | Polygala rimulicola Steyermark | Steyermark's milkwort | Polygalaceae
|
| PORU5 | Polygala rugelii Shuttlw. ex Chapman | yellow milkwort | Polygalaceae
|