思茅唐松草 si mao tang song cao

Plants 9--15 cm tall, glabrous. Stems branched. Leaves all basal, 7--13 cm, long petiolate; leaf blade 2-ternate, 5--9 × 6--8 cm; petiolule slender, 0.6--1.8 mm; leaflet blade suboblong, orbicular-ovate, or reniform, 0.9--1.8 × 1--2.8 cm, papery, abaxially pubescent, base subcordate, apex rounded or obtuse, 3-lobed; lobes acute at apex; veins flat on both surfaces. Inflorescence monochasial, 2(or 3)-flowered. Bracts shortly stipitate; blade ternate, ca. 7 mm. Flowers ca. 1 cm diam.; pedicel slender, 1.7--2.2 mm. Sepals 4, white, elliptic or broadly so, 2--3 mm. Stamens 9--15, 3.5--4 mm; filament filiform, 2.2--3 mm; anther oblong, 1--1.2 mm, apex shortly acuminate. Carpels 10--13; style hooked apically to circinate, subulate, ca. 1.2 mm, subequaling ovary; stigma inconspicuous. Achenes sessile; body fusiform, ca. 1.9 × 0.5 mm.

* Cliffs; ca. 2000 m. SW Yunnan (Simao Xian).

This species is similar to Thalictrum rostellatum, which differs in having leaflets abaxially and pedicels minutely puberulent, anther apex obtuse, carpels 4–7, and achenes shortly stipitate.