Herbs or small subshrubs, erect or suberect. Lvs usually opposite above and alternate below, simple, entire, pinnately veined. Infl. a terminal bracteate raceme, or fls solitary and axillary. Calyx deeply and ± equally 5-lobed. Corolla strongly zygomorphic; tube gibbous at base abaxially (appearing oblique), otherwise ± cylindric; limb 2-lipped; upper lip 2-lobed; lower lip 3-lobed with a pouch closing the throat. Stamens 4, included. Capsule asymmetric with 2 unequal loculi, the longer adaxial loculus opening by 1 apical pore. Seeds numerous, reticulate-rugose, not winged.