Cronquist, A. 1943. The North American species of Erigeron centering about E. speciosus (Lindl.) DC. and E. glabellus Nutt. Bulletin of the Torrey Botanical Club. 70(3): 265-274.

Cronquist, A. 1943. The North American species of Erigeron centering about E. speciosus (Lindl.) DC. and E. glabellus Nutt. Bulletin of the Torrey Botanical Club. 70(3): 265-274.