Reference:Fisher1957a
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Verbatim text: Fisher, T. R. 1957. Taxonomy of the genus Heliopsis (Compositae). Ohio J. Sci. 57: 171–191.
Author: Fisher, T.R.
Year: 1957
Title: Taxonomy of the genus Heliopsis (Compositae)
Journal: Ohio J. Sci
Volume: 57
Pages: 171–191