Shrubs or subshrubs, glabrous or pubescent with simple hairs. Leaves not divided, entire, crenate or dentate, sessile or shortly petiolate, spine-tipped or not; hard spines present in leaf axils On ours). Verticillasters distant, borne in upper leaf axils, 2-6(-8)-flowered. Calyx clearly differentiated into a tube and a spreading limb, 10-nerved, bilabiate, irregularly 5-toothed or more; in fruit coriaceous with the limb enlarging and horizontally spreading or reflexed. Corolla clearly bilabiate, yellowish-white; tube included within calyx, piloseannulate within; upper lip ± falcate or straight, vinous; lower lip spreading, 3-lobed median lobe larger than laterals. Stamens 4, didynamous; filaments glabrous or pilose; thecae 2-Jocular, glabrous. Style subequally bifid. Nutlets obovoid, apically obtuse-truncate or truncate.