Verbatim text: Freeman, J. D. 1975. Revision of Trillium subgenus Phyllantherum (Liliaceae). Brittonia 27: 1–62.
Author: Freeman, J.D.
Year: 1975
Title: Revision of Trillium subgenus Phyllantherum (Liliaceae)
Journal: Brittonia
Volume: 27
Pages: 1–62