Description from Flora of China
Shrubs 0.5-4 m tall. Branches brown to gray, glabrous, with pale elliptic lenticels. Petiole 5-10 mm; leaf blade elliptic, ovate, or rarely obovate-elliptic, 2-7 × 1.2-3.5 cm, leathery, midvein abaxially convex and adaxially flat, secondary veins slightly convex on both surfaces, base broadly cuneate to subrounded, margin entire, apex obtuse to slightly concave. Inflorescences terminal or subterminal cymes; bracts broadly ovate. Pedicel 2-3 mm. Sepals 5-7 × 2.5-3.5 mm, apex obtuse. Petals white; claw 2-3.5 cm; blades 1.5-2 × 1.2-1.5 mm, apex obtuse. Filament tube ca. 2.5 mm. Ovary 5-loculed; styles 5, longer than stamens; stigmas subcapitate. Capsule ovoid-ellipsoid, 1.1-1.6 × 5-7 mm, 5-valvate. Seeds with a membranous wing. Fl. May-Oct, fr. Oct-Nov.
The branches and leaves are used medicinally.
Sparse forests, valleys, rock crevices in forests, often on calcareous mountain slopes; 300-2000 m. Guangxi [Vietnam].