三棱瓜 san leng gua

Petiole 4-6 cm, pubescent at first, ultimately glabrous; leaf blade ovate-cordate, 8-12 × 6-10 cm, membranous, abaxially hispidulous on veins, adaxially sparsely puberulent at first, ultimately scabrous, margin sinuous-dentate, apex acute or shortly acuminate; basal sinus 2-2.5 cm deep. Male flowers usually 10-16 in a raceme or rarely solitary; peduncle slender, 12-15 cm; pedicel filiform, 5-8 mm; calyx tube 1.5-2 cm, apex 3-4 mm in diam.; segments 3-4 mm; corolla segments narrowly ovate, 10-15 × 3-5 mm, 3-veined, apex acuminate; filaments ca. 5 mm; pistillode 3-4 mm. Fruiting pedicel stout, 2-10 cm; fruit ovoid-3-angled, 6-7 cm, 3-4 cm in diam., glabrous or sparsely puberulent, apex 3-valved when mature. Seeds 13-14 × ca. 9 mm, ca. 2 mm thick. Fl. May-Aug.

Broad-leaved forests, grasslands; ca. 1700 m. Xizang [Bhutan, N India, Nepal].