微齿楼梯草 wei chi lou ti cao

Herbs perennial, dioecious, 40-50 cm tall. Stems ascending or erect, simple, glabrous. Leaves alternate, glabrous; nanophylls absent; petiole 2-7 mm; leaf blade obliquely oblong, 15-21 × 5.5-7 cm, papery, major basal lateral veins absent and venation pinnate, cystoliths conspicuous, dense; base obliquely cuneate, margin denticulate (denticulations ca. 0.5 mm), apex acuminate. Female inflorescences solitary, 4-6 mm in diam., sessile; receptacle 2-4 mm in diam.; bracts alternate, triangular; bracteoles linear. Achenes nearly ellipsoid, 8-ribbed. Fl. May-Jun.

* Tropical rain forests in valleys; 300-400 m. SE Yunnan.