柔毛网脉崖爬藤 rou mao wang mai ya pa teng

Lianas, woody. Branchlets terete, with longitudinal ridges, glabrous; tendrils bifurcate. Leaves 3-foliolate; petiole (3-)4-9 cm; central petiolule (0.8-)1.5-3 cm, lateral petiolules (0.3-)1-1.5 cm, glabrous; leaflets oval, ovate-elliptic, or oblong, 7-15 × 4-7 cm, glabrous, lateral veins 5-8 pairs, veinlets raised, base rounded or subrounded, sometimes central leaflet broadly cuneate, base of lateral leaflets asymmetric, margin with 4-9 teeth on each side, apex acute or mucronate. Compound dichasium or umbel axillary; peduncle 3-5.5 cm, lower part nearly glabrous, upper part sparsely pubescent. Pedicel 1-2 mm, pubescent, rarely subglabrate. Buds oval, 1.5-2.5 mm, apex rounded. Calyx shallow and saucer-shaped, papillose, rarely subglabrate, margin with undulate teeth. Petals 4, ovate-elliptic, 1.3-2.3 mm, apex galeate, papillose, rarely subglabrate. Stamen short, abortive in female flowers. Disk inconspicuous and annular in female flowers. Lower part of ovary adnate to disk; style inconspicuous; stigma 4-lobed. Berry elliptic, 6-7 × 5-6 mm, 1-seeded. Seed elliptic, ventral holes furrowed from middle to apex. Fl. Apr-May, fr. Aug-Sep.

● Forests or shrublands on hillsides; 400-1500 m. Guangxi, Yunnan.

Tetrastigma retinervium var. retinervium is known only from Vietnam.