Reference:Hitchcock1943a
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Verbatim text: Hitchcock, C. L. 1943. The xerophyllous species of Philadelphus in southwestern North America. Madroño 7: 36–56.
Author: Hitchcock, C.L.
Year: 1943
Title: The xerophyllous species of Philadelphus in southwestern North America
Journal: Madroño
Volume: 7
Pages: 36–56