Formerly Corydalis lutea. A relative of Bleeding-Hearts and Dutchman’s Breeches, native to Europe, but gaining a foothold in North America. It is not very common in Pittsburgh, perhaps completely unknown except for this patch, which was growing in the rocks beside a small stream in Frick Park, where it was blooming in late June. We suspect that this plant was deliberately introduced to Frick Park, but it is thriving there.