Wall.
Description
Thalictrum reniforme is a perennial herb distributed across the Himalayan arc from northern India through Nepal and Bhutan to southwestern China (Yunnan, Xizang, Sichuan). It occurs in moist, shaded habitats including forest margins, thickets, stream banks, and damp meadows at elevations of 1,800–3,500 m. The species is well represented in the western Himalayan foothills, as demonstrated by collections from Kunol in the Garhwal region of Uttarakhand, India, at 2,650 m, where plants have been observed in fruit as late as October.
The plant produces erect to ascending stems 30–80 cm tall from a short, fibrous-rooted rhizome. The leaves are bi- to triternately compound; the leaflets are distinctive for the genus, being reniform to orbicular, 1–3 cm wide, with a crenate to shallowly lobed margin. The leaflet surfaces are thin-textured and often glaucous beneath. The inflorescence is a lax, terminal panicle bearing numerous small, apetalous flowers. The sepals are four, ovate, greenish to purplish, caducous. The stamens are pendulous, with slender filaments and oblong anthers. The achenes are few per flower, stipitate, fusiform to obliquely ovoid, ribbed longitudinally, 3–5 mm long including the stipe.
Thalictrum reniforme is readily distinguished from most congeners by its conspicuously reniform leaflets, a character that inspired Wallich's specific epithet. The species belongs to a taxonomically challenging genus in which species boundaries are often obscured by morphological plasticity and hybridisation. With approximately 248 occurrence records in GBIF spanning India, Nepal, Bhutan, and China, it is moderately well collected. Ecologically, it contributes to the herbaceous understorey diversity of Himalayan temperate forests. No specific conservation concerns have been raised, though continued monitoring of its forest-dependent habitats remains advisable given ongoing pressures from logging and agricultural encroachment.
Author: Wall. · Sources: POWO (Kew), GBIF, Flora of China Vol. 6, Flora of Bhutan Vol. 1, Tamura: Thalictrum in Die Natürlichen Pflanzenfamilien (1995)