Cal strongly 5-nerved, with subulate lobes, the upper 3 ascending or erect, the lower 2 slightly longer, spreading or deflexed; cor strongly 2-lipped, the upper lip galeate-hooded, emarginate, densely white-villous, the lower deflexed, 3-lobed; stamens 4, about equal, ascending under the upper lip; nutlets hairy at the tip; perennial herbs or shrubs with large fls in dense clusters axillary to bracteal lvs. 100+, temp. Old World.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.