Corydalis montana Engelmann ex A. Gray. Phen: May-Jun. Hab: Bluffs, prairies, dry woodlands, disturbed areas. Dist: SD, WY, UT, and NV south to OK, TX, NM, AZ, and Mexico; disjunct eastwards in MO and n. IL.
Origin/Endemic status: Native
Taxonomy Comments: This taxon and C. aurea s.s. have variously been treated at the rank of species, subspecies, and variety; they probably warrant species rank.
Synonymy: = Il; = Corydalis aurea Willd. ssp. occidentalis (Engelm. ex A.Gray) G.B.Ownbey – FNA3, GrPl, K3, K4, NcTx; = Corydalis aurea Willd. var. occidentalis – F, G, K1, S, Tx; = n/a – C; < Corydalis aurea Willd.