Verbatim text: Keener, C. S. and W. M. Dennis. 1982. The subgeneric classification of Clematis (Ranunculaceae) in temperate North America north of Mexico. Taxon 31: 37-44.
Author: Keener, C.S., Dennis, W.M.
Year: 1982
Title: The subgeneric classification of Clematis (Ranunculaceae) in temperate North America north of Mexico
Journal: Taxon
Volume: 31
Pages: 37–44