Trees to 12 m tall, with spines when young. Branchlets sparsely pubescent or glabrous; branches grayish, rough with many small lenticels. Petiole 2--4 mm; leaf blade 2.5--10 X 1.5--6 cm, thinly papery, both surfaces glabrous, abaxially granular, base cuneate to slightly cordate, apex rounded, obtuse, or acute, basal veins 3--5. Thyrses terminal, ca. 9-flowered, pubescent. Calyx lobes broadly ovate. Corolla salverform, 1--1.5 cm; tube 7--12 mm, outside pubescent. Stamens inserted at corolla mouth, glabrous; filaments short; anthers oblong, 1.5--1.7 mm, apex exserted. Ovary globose, ca. l mm in diam. Style ca. 1.2 mm; stigma truncate. Berries globose, 2--2.5 cm in diam., smooth, glabrous, 2- or 3-seeded. Seeds nearly disc-shaped, 1.2--1.5 X 1--1.2 cm, densely pubescent. Fl. Mar-Jun, fr. Aug-Nov.

300--500 m. Cultivated in Hainan [Native in Australia, Indonesia, and Thailand].