Lianas. Stem gray-brown, glabrous, angulate. Leaves 3-foliolate; petiole 4-6 cm, glabrous; leaflets: petiolules 1-1.5 cm, adaxially shallowly channeled and sparsely pubescent; blade olive-green, narrowly elliptic or narrowly ovate to broadly lanceolate, 6-9 × 3-4 cm, subleathery, abaxially yellowish villous at vein axils, adaxially nitid and glabrous except sparsely pubescent at midvein base, lateral veins 3- or 4(or 5)-paired, distinctly raised abaxially, somewhat conspicuous adaxially, veinlets raised abaxially, inconspicuous adaxially, base rounded or subrounded and oblique on both sides, apex caudate-acuminate, rarely mucronate. Cymes axillary, sparsely yellowish villous; rachis ca. 2 cm. Flowers green. Outer tepals oblong, 4-5 mm. Inner tepals similar to and nearly as long as outer ones. Stamens ca. 2 mm, robust; filaments straight in bud; connectives sparsely pubescent; appendages small, solid. Ovary tetragonous, densely yellowish pubescent; style ca. as long as filaments, ca. 1 mm. Fruit unknown. Fl. Sep.

● Sparse valley forests; 100-300 m. S Guizhou, S Hunan.