Tetrastigma tonkinense Gagnep.

Lianas, woody. Branchlets terete, with longitudinal ridges, with dense curly ferruginous hirsute hairs. Leaves pedately 5-foliolate, rarely 3-foliolate; petiole 10-11 cm; central petiolule 1.5-1.8 cm, lateral petiolules very short or lateral leaflets subsessile, densely hirsute with curly hairs; leaflets oblanceolate or obovate-lanceolate, 9-13 × 3-4.5 cm, abaxially densely hirsute or at least on veins with curly ferruginous hairs, adaxially nearly glabrous, lateral veins 9-11 pairs, veinlets inconspicuous, base cuneate or broadly so, base of lateral leaflets asymmetric, subrounded, margin with 21-31 sharp teeth on each side, apex acuminate. Inflorescence umbelliform, axillary, 2-3 cm at fruiting stage, articulate at lower part and with bracts at nodes; peduncle ca. 1.2 cm, pubescent. Pedicel ca. 1.2 mm, pubescent. Buds ca. 1.5 mm, apex rounded and obtuse. Calyx saucer-shaped, pubescent, teeth 4. Petals ovate-elliptic, ca. 1.2 mm, apex corniculate, papillose. Disk inconspicuous and annular in female flowers. Lower part of ovary adnate to disk; style conspicuous; stigma 4-lobed. Berry globose, ca. 1 cm in diam., 3-seeded. Seed elliptic, base with very short rostrum, apex subrounded, chalazal knot inconspicuous, upper raphe slightly raised, surface smooth, ventral mid-raphe obviously raised, holes inconspicuous. Fl. Apr, fr. May.

S Guangxi [Vietnam].

Forests in valleys; 100-400 m.

Thâm bép (danh pháp: Tetrastigma tonkinense) là một loài thực vật hai lá mầm trong họ Nho. Loài này được Gagnep. miêu tả khoa học đầu tiên năm 1910.

越南崖爬藤（学名：Tetrastigma tonkinense）为葡萄科崖爬藤属的植物。分布在越南北部以及中国大陆的广西等地，生长于海拔100米至400米的地区，见于山谷疏林中，目前尚未由人工引种栽培。