Description from Flora of China
Jasminum coarctatum Roxburgh var. caudatifolium P. Y. Bai.
Shrubs scandent, 1-7 m. Branchlets flat, slightly swollen at nodes, pubescent. Leaves opposite, simple; petiole 2-10 mm, articulate near middle; leaf blades ovate or elliptic to lanceolate, 4.5-15 × 2-8 cm, papery, glabrous or sparsely pubescent along veins, base cuneate to rounded, rarely subcordate, apex acute to caudate-acuminate; primary veins 3-5 on each side of midrib. Cymes lateral, in heads or panicles, many flowered, congested; bracts leafy at base of inflorescences, 0.5-2.5 cm, upper ones linear and 2-4 mm. Flowers heterostylous. Pedicel short or absent. Calyx glabrous or pubescent, rarely villous; lobes 2-5 mm. Corolla white, salverform; tube 1.5-2.5 cm; lobes 5-9, narrowly lanceolate, (0.8-)1.2-1.7 cm. Berry black, ellipsoid or cylindric, 1-1.5 cm × 6-12 mm. Fl. Nov-May, fr. Apr-Jun of following year.
Jasminum tonkinense is sometimes confused with J. coarctatum Roxburgh.
Woods, thickets, ravines; 600-2000 m. S Guangxi, Guizhou (Anlong Xian), Yunnan [Vietnam]