Reference:Price1987a
Verbatim text: Price, R. A. 1987. Systematics of the Erysimum capitatum Alliance (Brassicaceae) in North America. Ph.D. dissertation. University of California, Berkeley.
Author: Price, R.A.
Year: 1987
Title: Systematics of the Erysimum capitatum Alliance (Brassicaceae) in North America