Cal regular, deeply saucer-shaped, divided to the middle into 5 broad obtuse lobes; cor bilabiate, the tube wide, the upper lip directed forward, 2-lobed, the lateral lobes of the lower lip also directed forward, the median lobe deflexed; stamens 4; sterile filament dilated at the summit, lying under the upper cor-lip; stigma capitate; fr septicidal; seeds angular, rugose; perennial herbs with opposite, petiolate, serrate or incised lvs and small, dull reddish-brown to greenish fls in large, terminal, paniculiform infls; cal not subtended by conspicuous bracts. 150, mainly temperate Eurasia.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.