西南唐松草 xi nan tang song cao

Thalictrum pallidum Franchet.

Plants ca. 50 cm tall, glabrous. Stems branched, slender. Basal leaves withered at anthesis. Cauline leaf stipules membranous; petiole 3.5--5 cm; leaf blade 3- or 4-ternate, 8--14 cm; petiolule 3--20 mm; leaflet blade rhombic-obovate, broadly obovate, or orbicular, 1--3 × 1--2.5 cm, herbaceous, papery, or leathery, base cuneate, rounded, or subcordate, apex entire or 1--3-toothed; veins raised abaxially. Inflorescence an umbel of monochasia. Pedicel slender, 10--35 mm. Sepals 4, deciduous, white or purplish tinged, elliptic, 3--6 mm. Stamens many; filament slightly broader than anther; anther narrowly oblong, ca. 1 mm. Carpels 2--5; style straight; stigma narrowly elliptic or linear. Achenes shortly stipitate; body fusiform, 4--5 mm. Fl. May--Jun.

* Forests, slopes, meadows, damp rocky ledges; 1300--2400 m. Gansu, Guizhou, Henan, Hubei, Shanxi, Sichuan.

This species is similar to Thalictrum tsawarungense and T. wangii, but differs in having leaflets conspicuously veined, filaments broader, and achenes fusiform.