迭叶楼梯草 die ye lou ti cao

Elatostema salvinioides var. angustius W. T. Wang; E. salvinioides var. robustum W. T. Wang.

Herbs perennial, dioecious, 12-17 cm tall. Stems erect, simple, pilose. Leaves alternate, glabrous; nanophylls narrowly obovate-oblong, 4-6 × 1.2-1.6 mm; stipules cordate, triangular, or lanceolate, 1-4 × 0.5-4 mm, without cystoliths; petiole 0.2-1.2 mm; leaf blade obliquely oblong or elliptic, 1-2.6 × 0.4-1 cm, herbaceous, veins obscure, cystoliths conspicuous, sparse; base obliquely cordate, margin entire or 1-2-crenate, apex obtuse or rounded. Male inflorescences solitary, simple, 0.5-1 mm in diam., sessile; receptacle obscure; bracts connate, ca. 2 mm; bracteoles broadly linear. Female inflorescences solitary, ca. 1 mm in diam., sessile; receptacle obscure; bracts oblong-lanceolate; bracteoles narrowly linear. Achene ellipsoid, ribbed. Fl. Apr-Aug.

Valley forests, rocks; 700-1600 m. Yunnan [Laos, Myanmar, N Thailand].