Agoseris aurantiaca var. purpurea
Variety purpurea is known mainly from the Colorado Plateau and southern Rocky Mountains. The two varieties are partially sympatric in the mountains of Colorado, Utah, southern Wyoming, and northern New Mexico, var. aurantiaca occurring only at very high elevations in that region. Wherever var. purpurea and var. aurantiaca occur together, they intergrade. Hybrids between var. purpurea and A. glauca or A. parviflora occur. One hybrid has been named (as a species): Agoseris aurantiaca var. purpurea × A. glauca var. dasycephala (= A. ×montana Osterhout) occurs sporadically at high elevations in the Rocky Mountains of Colorado.