细唐松草 xi tang song cao

Plants 25--70 cm tall, glabrous. Stems branched, smooth. Basal leaves withered at anthesis. Cauline leaf petiole 2--4 cm; leaf blade 3- or 4-pinnate, 5--17 cm; leaflet blade ovate or elliptic-obovate, 4--6 × 2--4 mm, herbaceous, base rounded, margin entire, apex rounded or obtuse; veins flat on both surfaces. Inflorescence monochasial, few flowered. Pedicel 7--30 mm. Sepals 4, deciduous, yellow, tinged greenish, obovate or elliptic, 2--3 mm. Stamens ca. 7 mm; filament filiform; anther narrowly oblong, 2--2.8 mm, apex mucronate. Carpels 4--6; stigma persistent. Achene stipe ca. 0.7 mm; body narrowly obovoid, laterally compressed, ca. 6 × 2.2 mm; veins 2. Fl. Jun.

* Dry hill slopes, field margins. C Gansu, N Hebei, Nei Mongol, Ningxia, N Shaanxi, Shanxi.