Piper madidum Y. C. Tseng; Piper nigrum Linnaeus var. macrostachyum C. de Candolle.

Climbers glabrous, dioecious. Stems terete, 2-4 mm thick, striolate; internodes (6-)10-13 cm. Leaves toward base of stem: petiole ca. 2.5 cm, prophyll ca. 7/8 as long as petiole; leaf blade broadly ovate, ca. 9.5 × 8 cm, papery, base shallowly cordate, ± symmetric, apex acute-acuminate; veins 7, all basal; leaves toward apex of stem (on flowering stems): petiole 1.5-2.5 cm, prophyll 1.3-2.2 cm; leaf blade ovate or narrowly ovate, 10-14 × 5-6.5 cm, base ± rounded, slightly oblique; veins 7, apical 2 arising 0.5-2.5 cm above base, arcuate-ascending ± to apex; reticulate veins conspicuous. Spikes leaf-opposed. Male spike pendulous, white, to 13 cm × ca. 1 mm; peduncle 0.8-1.5 cm, spreading; bracts oblong, ca. 1.5 × 0.5 mm, adnate to rachis. Stamens 2; filaments much longer than anthers. Female spikes 14-30 cm × ca. 1 mm; peduncle 1.5-2.2 cm; rachis glabrous; bracts oblong, base slightly narrowed,> fused to rachis, sides and apex free, 5.5-6 × 1.5-2 mm; stigmas 3 or 4, persistent, reflexed. Unripe drupe ovoid, 3-4 mm in diam., minutely rugulose or granular when dry.

600-900 m. Xizang (Mêdog Xian) [Bangladesh, NE India]