Pittonia 2: 177. 1891
Phenology: Flowering Jun–Sep.
Habitat: Lowland prairies
Elevation: 10–100 m
Oreg., Wash., and montane meadows or open pine forests, 1400–2800 m, Calif., Oreg., Wash.
Agoseris ×elata has been and continues to be an enigmatic taxon. Perhaps no other name in the genus has been so misunderstood and misapplied. Many herbarium specimens labeled A. ×elata are in fact misidentified. Specimens of A. ×elata are not abundant in herbaria; the number of actual collections is relatively small compared to those for other Agoseris. Specimens that belong to A. ×elata represent a complex assemblage that has relatively few defining features and appears to be of hybrid origin. Most specimens appear to be intermediate between A. grandiflora and A. aurantiaca; most also appear to have characteristics of A. monticola or A. glauca var. dasycephala. The exact parentage remains unclear.
Agoseris ×elata occurs in two geographically separated populations, which cannot be consistently distinguished morphologically: one mainly in scattered lowland prairie locations in the Puget Sound and Willamette Valley areas (the type collection came from this popula tion; no new collections have been taken from this region in over 65 years; it is likely extirpated) and another at high elevations in California, primarily in the Lake Tahoe region and southward in the Sierra Nevada.