Corydalis flavula (Raf.) DC.
Capnoides flavulum (Raf.) Kuntze
Fumaria flavula Raf.
Yellow corydalis, yellow fumewort, yellow harlequin
Yellow fumewort is native to North America.
Identification: Plants are up to 12" (30 cm) tall, with one or more emerging from a single taproot. Stems have angled sides and a reddish tint. Leaves are alternate, and finely divided. Flowers are in racemes (groups) up to 3" (8 cm) in size. Individual flowers are yellow, tubular, about ¾" (1.9 cm) long, opening at the end with serrated upper and lower petals and two smooth central petals. There is a spur on the back of each flower. They appear in April and May. Fruits are silques, like small bean pods, up to 1" (2.5 cm) long, turning dark red.
Corydalis flavula on Southeastern Flora, the Southeastern U.S. Plant Identification Resource
Corydalis flavula on Missouriplants.com
Corydalis flavula on the Connecticut Botanical Society's Connecticut wildflowers site
Corydalis flavula at 2bnTheWild.com
Corydalis flavula on Ontario Wildflowers
Corydalis flavula on eFloras
Corydalis flavula description by Thomas H. Kent, last updated 25 May 2020.