Zanonia clavigera Wallich, Pl. Asiat. Rar. 2: 28. 1831; Alsomitra clavigera (Wallich) M. Roemer; A. integrifoliola (Cogniaux) Hayata; A. pubigera Prain; A. tonkinensis Gagnepain; Gynostemma elongatum Merrill; G. integrifoliolum Cogniaux; Hemsleya elongata (Merrill) Cogniaux; H. henryi Cogniaux; Neoalsomitra integrifoliola (Cogniaux) Hutchinson; N. tonkinensis (Gagnepain) Hutchinson.

Herbs. Stem slender, much branched, pubescent or subglabrous. Leaf blade pedately 3-5-foliolate; petiole 1.5-2 cm, pubescent; leaflets abaxially pale green, adaxially green, oblong or oblong-lanceolate, median leaflet 7-14 × 3-7 cm, lateral leaflets smaller, 1- or 2-glandular, membranous or thinly papery, both surfaces pubescent along veins, lateral veins 4 or 5 pairs, base obtuse, apex acuminate; petiolule 0.5-1 cm, densely pubescent. Tendrils glabrous or pubescent, 2-fid. Male inflorescences paniculate, 12-30 cm, much branched; pedicel filiform, 4-8 mm, glabrous or pubescent; bracteole subulate-lanceolate, 1-2 mm, densely pubescent; calyx tube short; segments ovate-lanceolate to lanceolate-linear, ca. 2 × 1 mm, hirsute-pubescent; corolla white; segments ovate, 2-4 × 1.5-3 mm, abaxially densely pubescent, apex acute; filaments ca. 0.8 mm; anthers ovoid. Female flowers paniculate; calyx and corolla as in male flowers; ovary subcylindric, ca. 10 mm, pubescent; styles 3; stigma 2-lobed. Fruit capsular, cylindric, 4-8.5 × 1.5-2 cm, glabrous or pubescent, base obtuse, apex truncate, with numerous seeds. Seeds gray- or yellow-brown, substelliform, narrowly ovate, margin 4-7-dentate, 10-14 × 6-10 mm, both surfaces muriculate, apex with oblong, membranous, 15-22 × 6-8 mm wing. Fl. Sep-Nov, fr. Nov-Apr (following year).

Rain forests, broad-leaved forests, valleys, secondary forests. Guangdong, Guangxi, Taiwan, SE Xizang (Mêdog), Yunnan [Bhutan, Cambodia, NE India, Indonesia (Sumatra), Laos, Malaysia, Myanmar, Nepal, Philippines, Thailand, Vietnam; Australia (Queensland), Pacific islands (Fiji, Solomon Islands)].