Morphological characteristics: the shrub is 5-9 meters high; Branchlets stout, cylindrical, glabrous. The original branch is purplish red, the old branch is dark purplish brown, and there are scattered round lenticels. Winter buds are oval, purple-brown and hairless. Leaf blade is leathery, shiny, oblanceolate or obovate-oblong, 8- 13 cm long and 3.5-5 cm wide, with acute apex, wedge-shaped base, sparse and nearly round, inconspicuous circular serrations on the edge, hairless on both sides, slightly concave upper midvein and prominent lower midvein; Petiole length1.5-4cm, glabrous. Compound corymb, 5- 10 cm in diameter, with dense flowers; Pedicels are 3-5 mm long, and the total pedicels and pedicels are glabrous; Bracts caducous; The flower diameter is about1cm; Calyx tube campanulate, glabrous outside; Sepals triangular-ovate, about 2 mm long, about 2/3 shorter than calyx, with acute apex, entire, glabrous; Petals nearly round, white; Stamens 20; Styles 5, mostly in bundles, stigma capitate; The ovary is pilose outside, and its base is connected with receptacle. Fruit ovoid, 6-8 mm in diameter; Sepals persistent, erect. The full moon blooms and bears fruit in June.

Distribution: South Yunnan. Born in evergreen mixed forest on hillside or valley, altitude1400-2000 m. The type specimens were collected from Simao. Thailand, Myanmar and Laos are also distributed.