A shrub or small tree, up to 15 ft. high; branches slender, subquadrangular when young, soon terete, fistular, dark brown when dry, glabrous. Leaves lanceolate to lanceolate-elliptic, acuminate at both ends, 4–7 1/2 in. long, 1 1/4–3 1/4 in. broad, herbaceous, thin, glabrous above, very minutely and often sparingly puberulous on the nerves below; secondary nerves 10–14 on each side, oblique, slightly curved; petiole slender, very minutely puberulous, 4–6 lin. long. Inflorescences geminate from the young branch-forks, nodding, dichotomously corymbose or umbelliform, at first very dense, finally somewhat laxer, minutely puberulous usually up to the calyces; peduncles very slender, 2–3 in. long; bracts oblong to lanceolate, subacute, at length deciduous; pedicels up to 3 lin. long. Calyx wide-campanulate, 5–6 lin. long, rather thin, with a transverse zone of numerous small often paired glands some way above the base within; lobes very broad, rotundate or oblong-rotundate, at length reflexed, rather longer than the tube. Corolla greenish or greenish-yellow; tube stout, about 5–5 1/2 lin. long, constricted at the middle and mouth, twisted, very delicately velvety just below the stamens, otherwise glabrous; lobes obovate, reflexed, 2 1/2 lin. long, drying black. Stamens inserted above the middle of the corolla-tube; anthers slightly over 1 1/2 lin. long, tips slightly exserted, tails fine, incurved. Disc annular, fleshy, covering the ovary to half its height. Style 3 lin. long.
