| Polygala | type genus of the Polygalaceae: milkwort |
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| Polygala | perennial bushy herb of Central and southern United States having white flowers with green centers and often purple crest |
| Polygala | bog plant of pine barrens of southeastern United States having spikes of irregular yellow-orange flowers |
| Polygala | common trailing perennial milkwort of eastern North America having leaves like wintergreen and usually rosy-purple flowers with winged sepals |
| Polygala | eastern North American plant having a terminal cluster of small white flowers and medicinal roots |
| Polygala | small European perennial with numerous branches having racemes of blue, pink or white flowers |
| Polygala | trees, shrubs, and herbs widely distributed throughout both hemispheres |