Dorste'nia Contrayer'va, Contrayerva. -- The root, U.S.P. 1820-1850; W. Indies, C. And S. America. Acaulescent perennial; leaves lobed, radical, 10 Cm. (4') long; flowers staminate and pistillate, fruit capsule, disperses seed by hygroscopism; root (rhizome) fusiform, 1-2-headed, 5-7.5 Cm. (2-3') long, 12 Mm. 1/2') thick, reddish; odor unpleasant; taste acrid, bitter; contains contrayerbine, cajapine, volatile oil, resin, bitter principle, starch. Stimulant, tonic, aromatic, stomachic; low fevers, typhoid, diarrhea, dysentery, serpent bites; in decoction, tincture. Dose, gr. 30 (2 Gm.).