A much-branched undershrub, 1 1/2–2 ft. high, with pale slender woody branchlets, finely pubescent upwards. Leaves ovate, obtuse, irregularly crenate, glabrous, the lower 1–1 1/4 in. long and broad, truncate at the base; petiole nearly as long as the blade. Inflorescence a long terminal raceme; pedicels short; bracts linear, as long as the pedicels. Flower-calyx 1/8– 1/6 in. long, pubescent. Corolla purple; tube 1/3 in. long; lower lip 1/12 in. long. Stamens all four slightly protruded beyond the upper lip of the corolla.