Herbs or subshrubs. Leaves petiolate or often
subsessile or sessile, opposite. Cymes or racemes in spreading panicles, rarely
simple. Calyx distinctly 2-lipped. Corolla 2-lipped, tube exserted, straight or
decurved, equal or gibbous or often obtusely spurred at base, upper lip usually
broad, 2 to 4-fid, recurved, much shorter than lower lip, entire, boat-shaped,
usually narrow and stipitate at base. Stamens 4, didynamous, declinate,
filaments free, not toothed, usually glabrous, anther cells usually confluent.
Disk produced in front. Ovary 4-partite, styles slender, subequally 2-fid at
tip. Nutlets 4, dry, orbicular, ovoid or oblong, smooth, granulate or punctate.