稀蕊唐松草 xi rui tang song cao

Plants 20--60 cm tall, glabrous. Stems simple or distally branched. Leaves all basal; stipules membranous, margin toothed; petiole 3.8--4.6 cm; leaf blade 3-ternate, ca. 6 cm; petiolule slender, 1.5--4 mm; leaflet blade cuneate-obovate or broadly obovate, 1--1.5 × 0.9--1.2 cm, herbaceous, base rounded or broadly cuneate, apex rounded, 3-lobed; veins flat on both surfaces. Inflorescence paniculate, few branched. Pedicel slender, 2--12 mm. Sepals 4, deciduous, white, elliptic-ovate. Stamens 3--7; filament narrowly linear; anther yellow, elliptic, ca. 0.5 mm. Carpels 6--10; style short. Achene stipe 1--3.5 mm; body rhombic-ovoid, 2--3 mm; veins ca. 6, weak. Fl. Jul.

* Montane forests; 2600--3300 m. Gansu, Qinghai, Shanxi, Sichuan.

This species is similar to Thalictrum umbricola, but differs in having few-flowered, paniculate inflorescences and few stamens.