Planchonella yunnanensis C. Y. Wu in C. Y. Wu & H. W. Li, Yunnan Redai Yaredai Zhiwu Quxi Yanjiu Baogao (Rep. Stud. Pl. Trop. Subtrop. Yunnan) 1: 26. 1965.

Trees 5--15 m tall. Young parts soon glabrescent. Branchlets striate, with small and dense lenticels. Leaves alternate; petiole 1--1.5 cm; leaf blade oblanceolate, 9--20 X 2--5 cm, leathery, both surfaces glabrous, apex acuminate, veins conspicuous. Flowers in axillary panicle, usually umbellate, 12--20, closely clustered; peduncle 2--6 mm, rust colored pubescent. Calyx connate at base; sepals 5, ovate-triangular, ca. 2 X 1.5 mm, outside rust colored pubescent, inside glabrous. Corolla ca. 5 mm; lobes 5, ovate. Staminodes 5, petal-like, 3 mm, lengthening after flowering. Fruit a berry, green becoming black, ovoid, ca. 2.4 cm, glabrous. Seed 1, oblong-ovoid, ca. 2 cm; scar rounded, sub-basal. Fl. May, fr. Nov.

The criteria for placing this species in Sinosideroxylon is based on Auberville's view-point (Fl. Cambodge, Laos & Vietnam 3: 6. 1963.) that seed characters are important for generic delimitations.

* Dense forests; 1000--1600 m. SE Yunnan