Trees to 14 m tall, resinous. Branches and branchlets grayish black when dried, thick; lenticels fusiform, conspicuous. Stipules 1.8-2.6 cm, caducous. Petiole 1-1.5 cm; leaf blade broadly elliptic, 10-17 × 5-9.5 cm, leathery, base broadly cuneate, margin entire or denticulate apically from middle, apex acute to shortly acuminate. Inflorescences dichasial or trichasial cymes, 3-6 cm. Flowers usually 3 or 4, sessile, crowed at apex of branchlets. Calyx campanulate, 4-5 mm; lobes 6 or 7, triangular, 1.2-1.5 × 1-1.2 mm. Petals white, orbiculate, 1.2-1.6 × 1.6-1.8 mm. Stamens 12-14, equal in length. Ovary 4- or 5-loculed; style longer than calyx, thick; stigma lobes shallow, 4 or 5. Fruit not seen. Fl. spring.