Description from Flora of China
Evergreen trees to 30 m tall. Branchlets stout, brown tomentose, glabrescent. Petiole 2-6 cm, narrowly winged; leaf blade obovate to long obovate, 12-30 × 7-14 cm, secondary veins (9-)15-22(-40) on either side, margin serrate. Racemes terminal, 3-5-flowered; peduncle 3-5 cm, stout, both bracts and bractlets absent. Flowers 2-7, fragrant, 10-12 cm in diam., 4-5 cm in diam. in bud. Sepals oval, 2.5-4.5 × 2-3 cm, thickly fleshy, unequal, outer ones larger than inner ones. Petals yellow, yellowish white, or reddish, obovate, 5-7 cm, thin, base narrow, apex rounded. Stamens in 2 distinct groups, outer very numerous, slightly curved in bud, 1.5-2 cm, inner ca. 25, reflexed in bud; anthers dehiscing with pores. Carpels 8 or 9, ca. 1 cm; ovules many per carpel. Pseudocarps indehiscent, reddish to dull red. Seeds 1 or more per mature carpel, exarillate. Fl. Apr-May.
Mixed evergreen forests, wet places in valleys; 700-1000 m. S Guangxi, Hainan, S Yunnan [Vietnam].