Trees to 30 m tall, to 40 cm d.b.h. Branchlets glabrous. Petiole 2-2.5 cm, slender, glabrous, swollen at ends; leaf blade elliptic or obovate, 12-14 × 5-6 cm, papery, abaxially pubescent in vein axils only, adaxially glabrous, lateral veins 5 or 6 per side, 30° from midvein, both prominently raised abaxially, veinlets conspicuous abaxially, base acute or broadly cuneate, margin minutely serrate, apex acuminate. Flowers solitary. Pedicel 1-6 cm, glabrous. Sepals 4, ovate, both surfaces pubescent. Petals 4, yellowish, ovate or obovate, both surfaces sparsely pubescent. Stamens 5-7 mm. Ovary ovoid, sparsely pubescent; style glabrous. Capsule subglobose, ca. 6 cm in diam., 4-valvate; valves woody, with rigid prickles abaxially; prickles subulate, ca. 1.5 cm, sparsely setose, persistent. Fl. and fr. unknown.
Home