The Occurrence of Botrychium virginianum, var. europaeum in America
Fernald, Merritt Lyndon, 1873-1950 St. John, Harold, 1892-1991
Article
1915
Rhodora
17
233--234
BioStor
[Cambridge, Mass., etc.] New England Botanical Club [etc.]
BioStor: https://biostor.org/reference/179610