Herbs, annual, biennial, or perennial, soft, juicy, usually glabrous. Leaves usually alternate, pinnately or ternately divided. Inflorescence a simple bracteate raceme (compound with cymose or racemose partial inflorescences in some species of Corydalis sect. Strictae). Flowers blue, purple, orange, yellow, or white. Sepals petaloid, usually dentate. Corolla zygomorphic; upper petal spurred. Stamens 2 (i.e., filaments of each triplet completely fused); median upper stamen with a nectariferous appendage at base frequently fused to spur for a shorter or longer portion. Stigma variable. Fruit a usually many-seeded capsule with persistent style. Seeds black, with whitish elaiosomes (except in C. sect. Bipapillatae).
Seeds many, orbicular to reniform, smooth to pitted, bearing a caruncle.
Fruit a bicarpellate capsule having 2 valves
Petals 4, with the upper petal spurred, free or sometimes united at their base
Flowers irregular, yellow, rarely red or purple
Stigma persistent, flattened and lobed ; style slender
Stamens 6, in 2 bundles ; the outer anthers of each bundle are unilocular, the inner are bilocular ; the upper group also bears a nectary which is attached basally, lying in and partially attached to the inner side of the spurred petal
Herbs, annual or perennial, with tap roots, tubers or rhizomes
Inflorescence a panicle or raceme ; bracts persistent
Ownbey, G. B. 1947. Monograph of the North American species of Corydalis. Ann. Missouri Bot. Gard. 34: 187-260. Ownbey, G. B. 1951. On the cytotaxonomy of the genus Corydalis, section Eucorydalis. Amer. Midl. Naturalist 45(1): 164-186. Ryberg, M. 1955. A taxonomical survey of the genus Corydalis Ventenat, with reference to cultivated species. Acta Hort. Berg. 17(5): 155-175.