Reference:Porsild1947a
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Verbatim text: Porsild, A. E. 1947. The genus Dryas in North America. Canad. Field-Naturalist 61: 175–192.
Author: Porsild, A.E.
Year: 1947
Title: The genus Dryas in North America
Journal: Canad. Field-Naturalist
Volume: 61
Pages: 175–192