Buxus latistyla Gagnep.

Shrubs, 1-4 m tall; branchlets terete, ribbed and grooved; young branches tetragonous or subterete, glabrous or sparsely pubescent. Leaves inserted in different plants or sometimes in same plant, dimorphic in size; large leaves: petiole flat, 1-3 mm; leaf blade ovate or oblong-ovate, rarely rhomboid-ovate or lanceolate, 5-7 × 2-3.5 cm, coriaceous or chartaceous, adaxially puberulent along midrib, base rounded or obtuse, rarely acute, margin revolute, apex acuminate or acute, obtuse or with mucronulate tip; midrib elevated on both surfaces, lateral veins many, between them dense veinlets visible or obscure; small leaves: broadly ovate or elliptic, 2-4 × 1-1.5(-2) cm, base rounded, apex acute; lateral veins and veinlets more obscure on both surfaces. Inflorescences axillary and terminal, 8-10 mm, 5-6 mm in diam.; bracts ovate, apiculate, 2-2.5 mm, abaxially puberulent. Male flowers: pedicels ca. 1 mm; outer tepals ovate, ca. 2.5 mm, acute, abaxially puberulent; inner tepals longer and wider, glabrous; stamens 4-5 mm; anthers and superior half of filaments puberulent; sterile pistil discoid-tetragonous, ca. 1 mm in diam. Female flowers: pistil 4-5 mm; ovary 1.2-1.5 mm; style compressed and broad, 2.8-3.5 mm, apex attenuate, base ca. 1.6 mm in diam.; stigma oblong, decurrent to middle part of style. Capsule globose, up to 8.5 mm when mature, smooth; persistent style ca. 4 mm; persistent tepals triangular-ovate, ca. 2 mm; carpopodium 5-7 mm; bracts persistent. Fl. Mar-Apr, fr. May-Jul.

Forests on slopes, beside mountain streams. NW Guangxi, SE Yunnan (Funing) [Laos, N Vietnam].