Erigeron allocotus is a species of flowering plant in the family Asteraceae known by the common name Bighorn fleabane. It has been found only in the Bighorn Mountains of north-central Wyoming and southern Montana.Biota of North America Program 2014 county distribution map
Erigeron allocotus is a short, branching shrub rarely more than 18 cm (7 inches) tall. Leaves are 3-lobed. The inflorescence generally consists of 2 or 3 flower heads per stem, each head with sometimes as many as 40 small yellow disc florets and surrounded by a ring of up to 40 white or blue ray florets.Flora of North America, Erigeron allocotus S. F. Blake, J. Wash. Acad. Sci. 27: 379. 1937. Bighorn fleabane Blake, Sydney Fay 1937. Journal of the Washington Academy of Sciences 27(9): 379–380 diagnosis in Latin, description and commentary in English
References
External links photo of herbarium specimen at Missouri Botanical Garden, collected in Wyoming in 1936, isotype of Erigeron allocotus