绿春楼梯草 lü chun lou ti cao

Herbs perennial, monoecious, ca. 80 cm tall, glabrous. Stems ascending or erect, simple. Leaves alternate; nanophylls absent; stipules linear-lanceolate, 10-12 × 1.5-2.5 mm, glabrous, with cystoliths; petiole 5-11 mm; leaf blade obliquely elliptic, 10-13.5 × 4.5-5.5 cm, herbaceous, major basal lateral veins asymmetric, 1 basal, the other arising above base, cystoliths conspicuous, dense; base with broader half broadly cuneate or rounded, margin denticulate, apex acuminate or short acuminate. Male inflorescences solitary, simple, 1.4-2.6 × 0.9-1.4 mm; peduncle 18-22 mm; receptacle narrowly elliptic, 13-18 × 7-11 mm; bracts connate, ca. 0.8 mm; bracteoles narrowly linear. Female inflorescences solitary or in pairs, 3-4 × 2 mm; peduncle 0.5-1 mm; receptacle 2-3 × 1.5 mm. Male flowers 5-merous. Fl. Sep-Oct.

* Valley forests; 600-700 m. S Yunnan.