This plant is a low shrub, with a branching, pithy stem, about 2 or 3 feet high. The leaves are from 2 to 4 inches long by 1 to 1 1/2 broad, ovate, acuminate, finely serrate, opposite, deciduous, and borne on short petioles. The peduncles are axillary and terminal, dichotomous, and from 1 to 3-flowered. The flowers are greenish-yellow. Calyx tube oblong, limb 5-cleft, with 2 bracts; corolla twice as long as the calyx, greenish-yellow, 5-cleft, funnel-shaped; border 5-cleft, spreading. Stamens 5, which, with the style, are much exserted; stigma capitate. Capsule oblong, attenuate above, 2-celled, and naked, with many seeds (W.).