Herbs, subshurbs or shrubs. Leaves sessile,
subsessile or petiolate, lamina elliptic-lanceolate to broadly ovate.
Inflorescence in terminal raceme with whorls of 6 or less flowers. Bracts
reflexed, rarely coloured. Calyx 5-toothed, upper tooth broad, ovate, recurved,
margin decurrent on tube, 4 lower teeth subulate or awned, slightly connate or
not. Calyx tube ovoid, campanulate, deflexed in fruits. Corolla 2-lipped, upper
lip 3 to 4-fid, lower entire, concave, tube longer than calyx, straight or
incurved. Stamens 4, declinate, filaments free, without any basal appendage,
anther cells confluent. Disk gibbous. Styles slender, entire or slightly
notched stigma. Nutlets 4, dry, ovoid or orbicular, smooth, basal scar small.