小叶唐松草 xiao ye tang song cao

Thalictrum samariferum B. Boivin.

Plants 20--90 cm tall, glabrous. Stems simple or branched. Basal leaves withered at anthesis. Stipules membranous; petiole absent or 0.5--1.5 cm; leaf blade 3- or 4-pinnate, 1.3--5 cm; leaflet blade orbicular, orbicular-ovate, obovate, or rhombic-obovate, 1.5--4 × 1.5--4 mm, herbaceous, base cuneate, rounded, or subcordate, margin 3-lobed; veins slightly raised abaxially, flat adaxially. Inflorescence paniculate. Pedicel slender, ca. 3.3 cm. Sepals elliptic. Stamens many; filament narrowly linear; anther short, apex mucronate. Carpels 6--20; stigma persistent, recurved. Achene stipe erect, 3--4 mm; body obliquely obovoid, compressed, 5--7 × 3--4.2 mm, with narrow, lateral wings. Fl. Jul--Aug.

Forest margins, grassy slopes; 2700--4000 m. SW Sichuan, S Xizang, NW Yunnan [Bhutan, India, Kashmir, Nepal, Pakistan, Sikkim].

The main characters of this species are small leaflets and compressed achenes with narrow, lateral wings.