Myrsine undulata Wallich in Roxburgh, Fl. Ind. 2: 299. 1824; Choripetalum undulatum (Wallich) A. de Candolle; Embelia longifolia (Bentham) Hemsley; E. nagushia D. Don var. subcoriacea C. B. Clarke; E. subcoriacea (C. B. Clarke) Mez; Ribesiodes longifolium (Bentham) Kuntze; Samara longifolia Bentham; S. undulata (Wallich) Arnott.

Shrubs scandent, glabrous. Branchlets straight, often twisted, terete, 2-4.5 cm in diam., lenticellate. Petiole (0.8-) 1-1.5(-2) cm, deeply canaliculate, black punctate; leaf blade elliptic, oblong, or rarely obovate (4-)7.5-11.5(-18) × (1.8-) 3-5(-8) cm, papery to subleathery, black punctate-lineate, base acute or cuneate, decurrent on petiole, margin entire, apex acute or acuminate, rarely rounded; midrib prominent at both surfaces, black and red punctate-lineate abaxially; lateral veins numerous, prominent. Inflorescences lateral or axillary racemes 1-2(-6) cm, black punctate-lineate, glabrous; bracts deltate, 0.8-1.1 mm, sparsely glandular ciliate, apex acute. Flowers yellowish or greenish, 4-merous, staminate 2.5-3; pistillate 1-1.5 mm. Pedicel 1.5-3 mm, puberulent. Sepals subdeltate, glandular granulose, black punctate-lineate, margin entire, glandular ciliate, apex acute. Petals free, elliptic to ovate, red punctate outside, glandular granulose inside, margin entire, reflexed at anthesis, apex obtuse or acute. Stamens exserted up to 1 mm, staminodes ca. 2/3 petal length; anthers narrowly oblong, ca. 1 mm, base subcordate, apex truncate, connective black punctate. Ovary globose, glabrous. Style straight, epunctate; stigma capitate. Fruit globose or subglobose, (8-)1-1.5 cm in diam., longitudinally ribbed, black punctate. Fl. Apr-Aug, fr. Nov-Jan.

Dense evergreen broad-leaved forests, mixed forests, damp places, shrubby areas, valleys, hillsides; (300-)1200-2500(-2800) m. Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hunan, Jiangxi, Sichuan, Yunnan [Cambodia, India, Laos, Nepal, Thailand, Vietnam]