Inflorescences : racemes weak, generally exceeded by leaves. Flowers : petals sometimes crested. Capsules pendent or spreading at maturity, slender, 18-24(-30)mm. Seeds without marginal ring. 2 n = 16. Flowering spring-late summer. Talus slopes, ledges, rocky hillsides, forest clearings, open shores, creek bottoms, gravel pits, road cuts, and burned-over areas, in loose, often gravelly soil; 100-3400 m; Alta., B.C., Man., N.W.T., Ont., Que., Sask., Yukon; Alaska, Ariz., Calif., Colo., Idaho, Ill., Mich., Minn., Mo., Mont., Nebr., Nev., N.H., N.Mex., N.Y., N.Dak., Ohio, Oreg., Pa., S.Dak., Tex., Utah, Vt., Wash., Wis., Wyo.; n Mexico. Corydalis aurea subsp. aurea intergrades at times with C . aurea subsp. occidentalis , but usually the two can be distinguished readily when fruiting.

INFLORESCENCE: not exceeding leaves. FLOWERS: 13-16 mm long; spurs 4-5 mm long. FRUITS: spreading or pendant, 18-24 mm long. SEEDS without marginal ring. NOTES: See also parent taxon. Riparian areas and moist soil: Apache, Cochise, Coconino, Gila, Graham, Greenlee, Maricopa, Mohave, Pima, Santa Cruz, Yavapai cos.; 750-2200 m (2400-7200 ft); Mar-Aug; Widely distributed throughout n and w US and n Mex. REFERENCES: Holiay, Susan, and Abril Perez. 2001. Commelinaceae. J. Ariz. - Nev. Acad. Sci. Volume 33(1).