Thalictrum rostellatum Hook. fil. & Thoms.

Plants 40--60 cm tall, glabrous. Stems branched. Basal and proximal cauline leaves withered at anthesis. Cauline leaf stipule margin entire; petiole 1--3 cm; leaf blade 3-ternate, 6--12 cm; petiolule slender, 0.6--1.8 mm; leaflet blade broadly ovate or orbicular, 0.8--1.7 × 0.8--1.7 cm, herbaceous, abaxially minutely puberulent, base subcordate, apex rounded or obtuse, 3-lobed; lobes acute at apex; veins flat on both surfaces. Inflorescence monochasial, few flowered. Pedicel slender, 3--12 mm, minutely puberulent. Sepals white, ovate or narrowly so, 2--3 mm. Stamens 8--12; filament filiform; anther oblong, ca. 1 mm, apex obtuse. Carpels 4--7; style hooked-curved, ca. 3 mm. Achene stipe 0.8--1 mm; body obliquely narrowly ovoid or cylindric, laterally compressed, ca. 7 × 1.2 mm; veins ca. 8, weak. Fl. May.

Himalaya (Simla to Bhutan).

W Sichuan, S Xizang, NW Yunnan [Bhutan, NW India (Simla), Nepal, Sikkim].

2300-3200 m

Forests, damp rocky ledges; 2500--3200 m.

Flowering from May to July.

Thalictrum rostellatum is close relative of Thalictrum chayuense, but differs from the latter in its leaflets veins flat (vs. raised abaxially), plants up to 70 cm tall (vs. up 100-110 cm tall).

Thalictrum rostellatum is occurring in W Sichuan, S Xizang, NW Yunnan of China, Bhutan, NW India, Nepal, Sikkim.

Plants 40-70 cm tall, glabrous. Stems branched. Basal and proximal cauline leaves withered at anthesis. Cauline leaf stipule margin entire; petiole 1-3 cm long; leaf blade 3-ternate, 6-12 cm long; petiolule slender; leaflet blade broadly ovate or orbicular, herbaceous, abaxially minutely puberulent, base subcordate, apex rounded or obtuse, 3-lobed; lobes acute at apex; veins flat on both surfaces. Inflorescence monochasial, few flowered. Pedicel slender, 4-15 mm long, minutely puberulent. Sepals white, ovate or narrowly ovate. Stamens 8-12; filament filiform; anther oblong, apex obtuse. Carpels 4-7; style hooked-curved. Achene stipe ca. 1 mm; body obliquely narrowly ovoid or cylindric, laterally compressed; veins weak.

Growing in forest, damp rocky ledges; 2300-3000 m.