Corydalis solida, fumewort or bird-in-a-bush,[1] is a species of flowering plant in the family Papaveraceae, native to moist, shady habitats in northern Europe and Asia.

It is cultivated for its deeply divided, ferny leaves and narrow, long-spurred flowers which appear in spring.

The flowers show color variation, and may be mauve, purple, red, or white.

[2] The species was originally named in 1753 by Linnaeus as the variety solida of his Fumaria bulbosa.

Its current assignment to the genus Corydalis was made by Joseph Philippe de Clairville in 1811.