Verbatim text: Pringle, J. S. 1971. Taxonomy and distribution of Clematis, sect. Atragene (Ranunculaceae), in North America. Brittonia 23: 361-393.
Author: Pringle, J.S.
Year: 1971
Title: Taxonomy and distribution of Clematis, sect. Atragene (Ranunculaceae), in North America
Journal: Brittonia
Volume: 23
Pages: 361–393