Description from Flora of China
Trees ca. 20 m tall, with aromatic white resin. Bark gray or brown, flaky, white lenticellate. Petiole robust, ca. 2 cm, glabrous or farinose-scurfy; leaf blade oblong to oblong-ovate, 4-8 × 5-8 cm, thinly leathery, both surfaces glabrous or farinose-scurfy, lateral veins 9-12 pairs conspicuously raised abaxially, base rounded, margin entire, apex slightly obtuse or acuminate. Flowers arranged in lax panicle of unilateral racemes. Sepals ovate, ca. 2.5 mm, apex rounded, outer 2 pubescent on entire surface. Petals oblong or oblong-elliptic, ca. 6 mm. Stamens 15; anthers ovoid; connective appendages filiform, ca. 1 mm. Ovary and stylopodium ovoid, pubescent; style short, glabrous; stigma conspicuous. Fruit ovoid, waxy, apiculate; winglike calyx segments oblong or oblanceolate, 5-7 × ca. 2.5 cm, longitudinally 9-11-veined, sparsely stellate pubescent. Fl. Jun-Jul, fr. Nov-Dec.
This is an endangered species of scattered occurrence. The durable wood is used for making boats and building bridges and houses.
Dense forests; ca. 700 m. Hainan [N Vietnam].