- Polygala acanthoclada, Desert polygala
- Polygala adenophora
- Polygala alba, White milkwort
- Polygala amarella, Dwarf Milkwort
- Polygala ambigua, Whorled milkwort
- Polygala aparinoides
- Polygala appressa
- Polygala appressa_gracillima
- Polygala arcuata
- Polygala arvensis
- Polygala asperuloides
- Polygala balduinii, Baldwins Milkwort
- Polygala barbeyana, Blue milkwort
- Polygala berlandieri
- Polygala blakeana
- Polygala boykinii, Boykins Milkwort
- Polygala brevifolia, Littleleaf Milkwort
- Polygala brizoides
- Polygala calcarea, Chalk Milkwort
- Polygala californica, California milkwort
- Polygala chamaebuxus, Shrubby Milkwort
- Polygala chapmanii, Chapmans Milkwort
- Polygala chinensis
- Polygala coelosioides
- Polygala cornuta, Sierra milkwort
- Polygala costaricensis
- Polygala cowellii, Violet tree
- Polygala crenata, Scalloped milkwort
- Polygala cruciata, Drumheads
- Polygala curtissii, Curtiss milkwort
- Polygala cymosa, Tall Pinebarren Milkwort
- Polygala duarteana
- Polygala dukei
- Polygala durandii
- Polygala echinosperma
- Polygala eriocephala
- Polygala exsquarrosa
- Polygala fendleri
- Polygala fishiae
- Polygala flagellaris
- Polygala gabrielae
- Polygala galioides
- Polygala glandulosa, Glandular milkwort
- Polygala glochidiata, Tropical milkwort
| - Polygala glomerata
- Polygala grandiflora, Showy Milkwort
- Polygala hebeclada
- Polygala hecatantha, West Indian milkwort
- Polygala hemipterocarpa, Winged milkwort
- Polygala heterorhyncha, Beaked spiny polygala
- Polygala hookeri, Hookers Milkwort
- Polygala hygrophila
- Polygala incarnata, Procession flower
- Polygala intermontana, Intermountain milkwort
- Polygala isingii
- Polygala japonica, Dwarf Milkwort
- Polygala jefensis
- Polygala leptocaulis, Swamp milkwort
- Polygala leptostachys, Georgia Milkwort
- Polygala lewtonii, Lewtons milkwort
- Polygala linariifolia
- Polygala lindheimeri, Shrubby milkwort
- Polygala longicaulis, Longstem milkwort
- Polygala longifolia
- Polygala lutea, Orange Milkwort
- Polygala macradenia, Glandleaf milkwort
- Polygala macrobotrya
- Polygala maguirei
- Polygala maravillasensis, Maravillas milkwort
- Polygala mariana, Maryland Milkwort
- Polygala martiana
- Polygala membranacea
- Polygala microspora
- Polygala monspeliaca
- Polygala monticola
- Polygala myrtifolia, Cascade Curse
- Polygala nana, Candyroot
- Polygala nitida, Shining milkwort
- Polygala nudata, Smallflower milkwort
- Polygala nuttallii, Nuttalls Milkwort
- Polygala obscura, Velvetseed milkwort
- Polygala orbicularis
- Polygala ovatifolia, Eggleaf milkwort
- Polygala palmeri, Palmers milkwort
- Polygala panamensis
- Polygala paniculata, Orosne
- Polygala paucifolia, Gaywings
- Polygala penaea, Crevajosa
| - Polygala persicariifolia
- Polygala piliophora, Huachuca Mountain milkwort
- Polygala planellasi
- Polygala platycarpa
- Polygala polygama, Racemed milkwort
- Polygala praetervisa
- Polygala pretzii
- Polygala pseudocoelosioides
- Polygala pycnophylla
- Polygala ramosa, Low Pinebarren Milkwort
- Polygala ramosior
- Polygala rectipilis, New Mexico milkwort
- Polygala rhinanthoides
- Polygala rimulicola, Steyermarks milkwort
- Polygala rugelii, Yellow milkwort
- Polygala rusbyi, Rusbys milkwort
- Polygala sanguinea, Purple milkwort
- Polygala savannarum
- Polygala scoparioides, Broom milkwort
- Polygala senega, Seneca snakeroot
- Polygala serpyllifolia, Heath Milkwort
- Polygala setacea, Coastal Plain Milkwort
- Polygala smallii, Tiny milkwort
- Polygala spectabilis
- Polygala spruceana
- Polygala stenoclada
- Polygala subspinosa, Spiny milkwort
- Polygala subtilis
- Polygala tatarinowii
- Polygala tepperi
- Polygala timoutoides
- Polygala timoutou
- Polygala trichosperma
- Polygala triflora
- Polygala tweedyi
- Polygala variabilis
- Polygala verticillata, Whorled milkwort
- Polygala violacea, Violet milkwort
- Polygala virgata
- Polygala vulgaris, Common Milkwort
- Polygala watsoni
- Polygala wightiana
- Polygala wurdackiana
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