白茎唐松草 bai jing tang song cao

Thalictrum macrostigma Finet & Gagnepain (1906), not Edgeworth (1846), nor Lecoyer (1885); T. mairei H. Léveillé; T. sinomacrostigma W. T. Wang.

Plants 0.5--1.5 m tall, glabrous. Stems branched, sulcate. Leaves both basal and cauline; stipules membranous, margin entire; petiole ca. 10 cm; leaf blade 3-ternate or -pinnate, 6--14 cm; leaflet blade cuneate-obovate, orbicular-rhombic, or orbicular, 7--9 × 4.5--12 mm, herbaceous, base cuneate, orbicular, or subcordate, apex rounded, 3-lobed; veins flat on both surfaces. Inflorescence racemose. Pedicel 3--10 mm. Sepals 4, deciduous, yellow, tinged greenish, ovate, 3--4 mm. Stamens 6--7 mm; filament filiform; anther oblong, ca. 2 mm, apex mucronate. Carpels 2--5; style persistent, recurved, ca. 1.2 mm; stigma narrowly winged. Achene stipe slender; body lunate, ca. 8 × 2 mm. Fl. May--Jun.

* Grassy slopes; 2500--3800 m. S Qinghai, W Sichuan, NW Yunnan.

This species is similar to Thalictrum rutifolium, which differs in having small sepals and short, wingless stigmas.