Reference:Williams1957a
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Verbatim text: Williams, E. W. 1957. The genus Malacothrix (Compositae). Amer. Midl. Naturalist 58: 494–512.
Author: Williams, E.W.
Year: 1957
Title: The genus Malacothrix (Compositae)
Journal: Amer. Midl. Naturalist
Volume: 58
Pages: 494–512