锈茎楼梯草 xiu jing lou ti cao

Herbs perennial, dioecious, 30-45 cm tall. Stems suberect, simple, densely ferruginous-furfuraceous. Leaves alternate; nanophylls absent; stipules linear-lanceolate, 8-14 × 1.5-2.5 mm, glabrous, without cystoliths; petiole 0-1 mm; leaf blade obliquely elliptic, 7-17 × 2-5 cm, herbaceous, major basal lateral veins both arising at base of leaf blade, abaxial surface glabrous, adaxial surface strigillose along veins, cystoliths conspicuous, dense; base obliquely cuneate, margin dentate, apex caudate or caudate-acuminate. Female inflorescences solitary, ca. 8 × 4 mm; peduncle 12-16 mm; receptacle oblong, ca. 5 × 3 mm; bracts triangular; bracteoles narrowly spatulate or linear. Achenes ellipsoid, 5- or 6-ribbed. Fl. Jul-Aug.

* Rocks in evergreen broad-leaved forests; 1300-1400 m. NW Yunnan.