Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Genus Description - Fls perfect, regular, perigynous, 5-merous; hypanthium turbinate to saucer-shaped, adnate to the base of the carpels; pet narrow, deeply pinnatifid or fimbriate to entire; stamens 10 (in ours) or 5; carpels 2, connate into a 2- beaked, unilocular, superior (to half-inferior) ovary with low-parietal placentas; rhizomatous herbs with basal or alternate, palmately veined lvs from the rhizome, the flowering stems lfless or nearly so, with a terminal bracteate raceme of small white, greenish, or purple fls. 12, N. Amer., e. Asia.
bishop's cap, mitrewort