Reference:Hsi1960a
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Verbatim text: Hsi, Y.-T. 1960. Taxonomy, Distribution and Relationships of the Species of Cirsium Belonging to the Series Undulata. Ph.D. dissertation. University of Minnesota.
Author: Hsi, Y.-T.
Year: 1960
Title: Taxonomy, Distribution and Relationships of the Species of Cirsium Belonging to the Series Undulata