Pseudofumaria lutea 
Corydalis lutea (syn. Pseudofumaria lutea; Yellow Corydalis) is a short-lived perennial plant 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 cm (¾ in) long, borne in racemes on short, branched, leafy stems from late spring to autumn. They have 4 petals, the top and bottom ones crested, the top one with a short, rounded spur curved downwards, the 2 inner ones connected at the tip.
Yellow Corydalis is hardy to –34°C (-30°F; hardiness zone 4). It does best in light shade with good moisture, but will tolerate both full sun and deep shade. It grows wild in cracks in old walls where drainage is excellent.
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- Germplasm Resources Information Network
- Flora Europaea
- Missouri Botanical Garden (Corydalis lutea)
- UK Wildflowers
- USDA PLANTS Profile
- (German) Botanischer Garten Bochum (Corydalis lutea)
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