柔毛楼梯草 rou mao lou ti cao

Herbs perennial, dioecious, up to 45 cm. Stems aggregated, ascending or suspending, branched, densely villous. Leaves alternate; nanophyll absent; stipules narrowly triangular, 3-5.5 mm, hirsute on abaxial surface; petiole 0-1 mm; leaf blade obliquely obovate-oblanceolate, 2-5.5 × 0.7-2.2 cm, thickly papery, major basal lateral veins absent and venation pinnate, cystoliths conspicuous, dense; base with broader half cordate, margin serrate, apex cuspidate. Female inflorescences solitary, ca. 4.5 mm in diam.; peduncle to 1 mm or absent; receptacle ca. 3 × 3 mm in diam.; bracts connate into a subquadrate involucre; bracteoles narrowly lanceolate. Achenes ovoid, ca. 12-ribbed. Fl. Jun.

* Ravines, moist forests; at low to medium elevations. S Taiwan.