Verbatim text: Payson, E. B. 1918. The North American species of Aquilegia. Contr. U.S. Natl. Herb. 20: 133-157.
Author: Payson, E.B.
Year: 1918
Title: The North American species of Aquilegia
Journal: Contr. U.S. Natl. Herb
Volume: 20
Pages: 133–157