Reference:Constance1938a
Verbatim text: Constance, L. 1938. A revision of the genus Douglasia Lindl. Amer. Midl. Naturalist 19: 249–259.
Author: Constance, L.
Year: 1938
Title: A revision of the genus Douglasia Lindl
Journal: Amer. Midl. Naturalist
Volume: 19
Pages: 249–259