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Botrychium virginianum and its forms
Tidestrom, Ivar
Date:
1913
Citation:
Tidestrom, Ivar. 1913. "Botrychium virginianum and its forms." in Systematic investigations in phanerogams, ferns, and mosses, 299–303. Contributions from the United States National Herbarium. Washington, DC: Government Printing Office.