Adinandra petelotii Gagnepain; A. serrulata H. L. Li.

Trees 5-20 m tall. Bark grayish brown. Young branches brown, glabrous; current year branchlets densely ferruginous-brown appressed pubescent; terminal buds densely ferruginous appressed pubescent. Petiole 1-1.5 cm, appressed ferruginous pubescent; leaf blade oblong to oblong-elliptic, 14-25(-28.5) × 4-7(-8.5) cm, leathery, abaxially pale green, ferruginous appressed pubescent or glabrescent, and becoming pale brown when dry, adaxially dark green and pubescent along midvein when young but glabrescent, midvein abaxially elevated and adaxially impressed, secondary veins 20-26 on each side of midvein and slightly raised on both surfaces, base broadly cuneate to rounded, margin serrulate, apex acuminate. Flowers axillary, solitary. Pedicel 2-4 cm, slender, recurved, appressed pubescent, apically thickened; bracteoles caducous, oblong, 6-7 × ca. 3 mm, both surfaces appressed pubescent. Sepals broadly ovate, unequal, 1-1.3 × 0.8-1 cm, leathery, outside sericeous along median portion, inside glabrous, apex obtuse. Petals white, broadly ovate-oblong to elliptic, unequal, 10-13 × 6-7 mm, outside ferruginous sericeous along middle portion, inside glabrous. Stamens 40-45; filaments ca. 2 mm, distinct, glabrous; anthers ca. 4 mm, abaxially densely sericeous, connective exserted. Ovary conic, densely ferruginous sericeous, 5-loculed with many ovules per locule; style ca. 1 cm, simple, densely sericeous. Fruit purplish black when mature, globose, ca. 2 cm in diam., densely sericeous. Seeds brown, compressed reniform, shiny. Fl. Jun-Jul, fr. Oct-Nov.

Forests on mountain slopes or in valleys; 1200-1900 m. NW Guangxi, SE Yunnan [N Vietnam].