Reference:Fernald1915a
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Verbatim text: Fernald, M. L. and K. M. Wiegand. 1915. The genus Euphrasia in North America. Rhodora 17: 181–201.
Author: Fernald, M.L., Wiegand, K.M.
Year: 1915
Title: The genus Euphrasia in North America
Journal: Rhodora
Volume: 17
Pages: 181–201