Menyan'thes trifolia'ta, Buckbean, Bogbean, Water Shamrock. -- The root (rhizome), U.S.P. 1820-1830; dried leaves; United States. Perennial herb, 2.5-3.7 M. (8-12 degrees) high; rhizome 1-2.5 Cm. (2/5-l') thick, slightly longer, branching, black; leaves on petioles, 10-15 Cm. (4-6') long, ternate, leaflets sessile, 5-8 Cm. (2-3') long, obtuse, obovate, entire or crenate, smooth, pale green, inodorous, bitter; contains menyanthin (glucoside, yields menyanthol), mucilage, albumin, sucrose, fat, ash 10 p.c. Tonic, febrifuge, emmenagogue, antiscorbutic, vermifuge; large doses emetic, purgative; rheumatism, scrofula, scurvy, dropsy, intermittents, jaundice, dyspepsia, worms. Dose, gr. 15-30 (1-2 Gm.).