The petiole is slightly rough, with rough bristles, 10-16 (-20) cm long; the leaves are wide oval heart-shaped, membranous, 7-20 cm in length and width, both sides are very rough, with rough bristles, 3-5 Two angles or lobed, lobes triangular, toothed, sometimes marginal, sharp or acuminate at the apex, semicircular at the base, 2-3 cm wide, 2-2.5 cm deep, sometimes the base abuts back.
Monoecious. Male flowers: constant clusters in the leaf axils; slender pedicel, 0.5-1.5 cm long, puberulent; calyx tube narrowly campanulate or nearly cylindrical, 8-10 mm long, densely covered with white pilose, calyx lobes drilled Shaped, expanded, nearly as long as the calyx tube; corolla yellow-white, about 2 cm long, corolla lobes oblong-lanceolate, acutely pointed; stamens 3, filaments nearly absent, anthers 3-4 mm long, drug septum protruding, It is about 1 mm long. Female flowers: solitary or sparsely clustered; pedicel thick, pilose, 1-2 cm long; ovary fusiform, rough, with small spiny protrusions.
The fruit is oblong or cylindrical, 10-30 (-50) cm long, yellow-green when ripe, with rough surface, with thorn-pointed tumor-like protrusions, very rare and nearly smooth. The seeds are small, narrowly ovoid, white, without edges, with nearly sharp ends at both ends, about 5-10 mm long. Flower and fruit period in summer.
