Agoseris consists of widespread species that individually exhibit great morphologic plasticity. Difficulty in correctly identifying individual specimens is compounded by traits that may vary from region to region, the perpetuation of misleading or inaccurate traits in the literature, and the presence of intermediates. Correct identification of Agoseris specimens can be assisted by knowing that species may exhibit variable traits (e.g., pubescence, corolla color, cypsela morphology), some species have leaf lobing variable on single plants (e.g., outermost entire versus inner lobed), and intermediate specimens may occur with any sympatric taxa. Hybridization among members of the genus is common, especially among polyploid taxa, and some hybrid populations appear to be persistent. Autogamy has been demonstrated in some species (K. L. Chambers 1963) and is suspected in others. It appears to be correlated with a reduction in corolla and anther size. Autogamous populations or taxa often exhibit seemingly unique features that appear localized. Attempts at naming these variant populations or regional phases have resulted in a large number of synonyms.