Threadleaf Corydalis is a Himalayan herb with flowers yellow or sometimes
orange, with brown-purple or violet tips. Flowers are borne in a dense,
almost flat-topped cluster 3-5 cm long. Flowers are 1.2-1.8 cm long
including the spur which is much less than half as long as the flower.
Upper petal has a prominent dorsal wing. Leaves are glaucous, many times
cut into linear or threadlike pointed segments. Basal leaves are large,
10-30 cm, long-stalked. Threadleaf Corydalis is an erect or spreading
leafy perennial herb, usually unbranched, 15-30 cm tall, with a thick
rootstock, covered with old leaf bases. Capsule is oblong-elliptic, 7-10
mm, with a curved style. It is found in the Himalayas, from Himachal
Pradesh to SE Tibet. Flowering: June-August.