Verbatim text: Erickson, R. O. 1943. Taxonomy of Clematis section Viorna. Ann. Missouri Bot. Gard. 30: 1-62, plate 1.
Author: Erickson, R.O.
Year: 1943
Title: Taxonomy of Clematis section Viorna
Journal: Ann. Missouri Bot. Gard
Volume: 30
Pages: 1–62
Note: plate 1.