Verbatim text: Bogle, A. L. 1968. Evidence for the hybrid origin of Petasites warrenii and P. vitifolius. Rhodora 70: 533–551.
Author: Bogle, A.L.
Year: 1968
Title: Evidence for the hybrid origin of Petasites warrenii and P. vitifolius
Journal: Rhodora
Volume: 70
Pages: 533–551