Verbatim text: Gates, R. R. 1917b. A systematic study of the North American genus Trillium, its variability and its relation to Paris and Medeola. Ann. Missouri Bot. Gard. 4: 43–92.
Author: Gates, R.R.
Year: 1917b
Title: A systematic study of the North American genus Trillium, its variability and its relation to Paris and Medeola
Journal: Ann. Missouri Bot. Gard
Volume: 4
Pages: 43–92