Herb or undershrub. Flowers small, in terminal and axillary, many-flowered, peduncled, compound cymes. Calyx subcampanulate, 8-nerved, 5-toothed, the teeth subequal; throat naked within. Corolla shortly exserted, tube slightly enlarged upwards; limb 2-lipped, upper lip suberect or recurved, 2-fid, lower lip 3-lobed, spreading, midlobe larger than the lateral ones. Stamens 4, exserted, in 2 pairs, the upper pair slightly shorter; anthers reniform, 2-celled, at length confluent. Disk small, equal, entire. Style briefly 2-fid, branches very short. Nutlets obovoid, rugose and hirsute, scar very large, lateral.