borrowed from New Latin, genus name, going back to Latin, "milkwort," borrowed, with declensional change, from Greek polýgalon, from poly-poly- + -galon, derivative of galakt-, gála "milk" — more at galaxy
The genus was introduced by linnaeus in Species plantarum (Stockholm, 1753), tomus 2, p. 701.
capitalized: a genus of herbs and shrubs (family Polygalaceae) of temperate and warm regions having many colored often showy flowers and including some (as the seneca snakeroot) which have been used in medicine
: any plant of the genus Polygala
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