Verbatim text: Moore, R. J. and C. Frankton. 1974b. The Cirsium arizonicum complex of the southwestern United States. Canad. J. Bot. 52: 543–551.
Author: Moore, R.J., Frankton, C.
Year: 1974b
Title: The Cirsium arizonicum complex of the southwestern United States
Journal: Canad. J. Bot
Volume: 52
Pages: 543–551