Corydalis lutea is an obsolete name for Pseudofumaria lutea, which is sometimes called Yellow Corydalis (Lutea means yellow), Rock Fumewort, or Yellow Rock Fumewort. Fumewort is a common name that, like most common names, can refer to many different types of plants. 'Canary Feathers' is a hybrid between Corydalis moorcroftiana (seed parent) and Corydalis wilsonii (pollen parent). So, 'Canary Feathers' is not a member of the Pseudofumaria lutea species.

If you are still looking for a Pseudofumaria lutea (aka Corydalis lutea), check with Avant Gardens, Forestfarm, or Romence Gardens & Greenhouses for plants or J.L. Hudson Seedsman for seed.