Royle

Description
Corydalis vaginans is a Sino-Himalayan herb of the western and central Himalaya, with georeferenced collections concentrated in India, Pakistan and Nepal; GBIF records some 164 occurrences. It is a plant of cool, humid temperate to subalpine zones, favouring shaded forest margins, moist rocky banks, stream sides and clearings within Quercus and Abies forest. The image, taken near Didina in Garhwal (India) at about 2470 m in September, illustrates its typical late-season flowering in this moist mid-montane belt, where it grows among ferns and tall herbs on humus-rich, well-drained slopes.
The plant is a slender, glaucous, glabrous annual or short-lived perennial arising from a slender taproot. Stems are erect to ascending, somewhat fleshy and ribbed, branched above. The leaves are alternate, the lower long-petiolate and conspicuously sheathing at the base (the epithet vaginans referring to these dilated sheaths), the blades two- to three-pinnately divided into ovate to cuneate, lobed segments. Flowers are borne in lax terminal and axillary racemes, zygomorphic and yellow, with two outer petals one of which is spurred and the inner petals connate and crested. The fruit is a slender, dehiscent siliquiform capsule containing several shining black seeds with an elaiosome.
Within the large, taxonomically intricate genus Corydalis, this species belongs to the predominantly Asian assemblage of mesophytic, sheathing-leaved annuals, distinct from the tuberous spring-flowering groups. Its ant-dispersed seeds (myrmecochory) and shade-tolerant habit allow colonisation of disturbed forest soils. Though not assessed as threatened, populations are localised and dependent on intact temperate forest cover, sensitive to deforestation and grazing in the western Himalaya.
Author: Royle · Sources: POWO (Kew), GBIF, Flora of Pakistan, Flowers of the Himalaya (Polunin & Stainton), Lidén & Zetterlund monograph of Corydalis


















