Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Genus Description - Much like Allium, but inodorous; fls perfect; tep 6, all alike; stamens 6; filaments slender, adnate to the base of the tep and half as long; anthers linear, introrse, versatile; ovary shallowly 3-lobed, with 6–10 ovules per locule; style straight, slender; stigmas 3, minute; fr loculicidal; perennial herbs from a coated bulb, with basal linear lvs, an erect scape, and a terminal determinate umbel subtended by 2 membranous bracts. 35, New World.