Corydalis aurea subsp. occidentalis, or C.curvisiliqua. Magnification of the seeds and capsule lengths at maturity is the best way to tell them apart. C. aurea will always have smooth seeds with a marginal ring, and capsules 10- 20 mm long, C. curvisiliqua has finely roughened seeds with longer capsules around 18- 35 mm long (usually longer bracts too).