Shrubs, subshrubs or occasionally small trees; branches terete or slightly angular, usually pubescent; indumentum often of mixed hair types including medifixed, tightly curled and/ or long straight hairs. Leaves simple, alternate; stipules usually present. Flowers 1–several per axil, sessile or pedunculate, or fasciculate to shortly racemose; bract unaccompanied by scales; bracteoles paired on upper part of pedicel; calyx with the 2 upper lobes usually largely united into a broad lip; corolla blue to mauve, occasionally white; staminal sheath split open on the upper side; anthers alternately basifixed and dorsifixed, the latter usually shorter. Pods transversely ellipsoid to obliquely globular or ovoid, turgid, the valves coriaceous, separating along both sutures, 2–several-seeded; seeds ellipsoid or obliquely ovoid, the elliptic to linear hilum 3 or more times as long as broad, surrounded by a collarlike aril.
Endemic genus of c. 20 species, occurring in all States.