Branchlets terete, with longitudinal ridges, densely pubescent; tendrils unbranched. Leaves simple; stipules brown, lanceolate, 1-2 × 0.3-0.5 mm, membranous, glabrous; petiole 1-2 cm, densely pubescent; leaf blade ovate-lanceolate or triangular-ovate, 3.5-9 × 1.5-4 cm, abaxially pubescent on veins, adaxially sparsely pubescent on veins, basal veins 5, outermost pair of veins usually on a line, lateral veins 5 or 6 pairs, base subtruncate or rounded, margin 10-15-toothed on each side, teeth sharp and fine, apex acute. Panicle leaf-opposed, 2-6 cm, narrow, basal branches undeveloped. Pedicel 1.5-2.5 mm, subglabrate. Buds obelliptic, ca. 1.5 mm, apex rounded. Calyx subentire. Filaments filiform, ca. 0.8 mm; anthers yellow, elliptic, ca. 0.5 mm. Ovary conical; style short. Berry purple-black at maturity, globose, 5-8 mm in diam. Seeds obelliptic, apex rounded, chalazal knot elliptic, ventral holes obelliptic and broad, furrowed upward from base to apex.