Climbers dioecious. Stems terete, 2-4 mm thick, coarsely striate. Leaves toward base of stem: petiole ca. 0.8-1.3 cm, tomentose, prophyll up to 1/2 as long as petiole; leaf blade ovate or narrowly ovate, 10-18 × 5-10 cm, papery, glabrous to abaxially tomentose, adaxially pilose along veins, base cordate, oblique, apex acute or acute-acuminate; veins 9, apical pair arising 1-3 cm above base, others basal; reticulate veins conspicuous. Spikes leaf-opposed. Male spikes 5.6-7.5 cm × 3-4 mm; peduncle 2.5-3 cm, long villous; rachis white villous; bracts orbicular or nearly so, ca. 1.5 mm wide, peltate, subsessile. Stamens 2; filaments very short. Female spikes ca. 1 cm × 2 cm; peduncle 1.5-2 cm, usually pubescent; rachis and bracts as in male spikes. Ovary partly immersed in rachis; stigmas 3 or 4, small. Unripe drupes few, globose, 3-3.2 mm in diam.

* 700-900 m. Xizang.