Tree 5-15 m high with all parts glabrous; sap milky. Leaves opposite and decussate, crowded towards the tips of the branches, subcoriaceous, dull when dry, oblong-oblanceolate, 8-16 cm long and 2-2-5-5 cm broad, base narrowly cuneate, apex broadly rounded or rarely obtuse, usually with scattered acarodomatia on the lower surface; secondary nerves 8-12 on each side, widely spreading, indistinct; petiole 0-8-2-2 cm long. Stipules small, united in an interpetiolar rim or short sheath; axillary glands present. Inflorescence usually arising in pairs, terminal, dense, few-flowered consisting of racemosely arranged reduced cymes; peduncle stout, 2-5-8 cm long; bracts broadly ovate, obtuse, early caducous. Flowers fairly large, up to 4-5 cm in diameter, fleshy, white to yellowish, unpleasantly scented; pedicels 5-7 mm long. Calyx wide tubular, 1-1-4 cm long and 1 cm in diameter, early circumscissile at the base with numerous glands within; lobes short, rounded, 3-4 mm long and 6-7 mm broad. Corolla salver-shaped, tub