糙梗楼梯草 cao geng lou ti cao

Herbs perennial, monoecious, to 1 m tall. Stems ascending or erect, often simple, hirtellous or glabrescent. Leaves alternate; nanophylls absent; stipules subulate, 2-5 × 0.1-0.2 mm, glabrous; petiole to 2 mm or absent; leaf blade papery, obliquely elliptic to obliquely ovate, ca. 20 × 1.5-7 cm, semitriple-nerved, cystoliths conspicuous, sparse; base broadly cuneate or rounded, margin dentate or crenate, apex acuminate or caudate. Male inflorescences ellipsoidal, 7-18 × 7-12 mm, branched; peduncle (1-)1.5-4.5(-5) mm; receptacle absent; bracts ovate or elliptic; bracteoles cymbiform. Female inflorescences solitary or paired, ellipsoidal, ca. 8 × 6 mm; peduncle to 2(-8) mm; receptacle elliptic, ca. 8 × 6 mm; bracts ovate or elliptic; bracteoles linear. Male flowers: perianth lobes 5; stamens 5. Achenes ovoid. Fl. Oct.

* Streamsides, ravines, moist forests or rocky places at low to medium elevations. Taiwan.