Pseudofumaria lutea (syn. Corydalis lutea), the yellow corydalis or rock fumewort, is a short-lived perennial plant in the poppy family Papaveraceae. It is native to the southern foothills of the south-western and central Alps of Italy and Switzerland, but widely introduced elsewhere. Yellow corydalis grows to 30–38 cm (12–15 in) tall. Leaves are finely divided and yellow-green to gray-green, often remaining over winter. Flowers are 2 centimetres (0.75 in) long, borne in racemes on short, branched, leafy stems from late spring to autumn. They have 4 petals.