n. 1.1 a gentian of East North America having clusters of bristly blue flowers. Syn. -- ague weed, five-flowered gentian, stiff gentian, Gentianella quinquefolia, Gentiana quinquefolia [ WordNet 1.5 ]
2. a perennial herb of the southeastern U. S. having white-rayed flower heads. It was formerly used in folk medicine. Syn. -- boneset, thoroughwort, Eupatorium perfoliatum [ WordNet 1.5 ]