Reference:Sargent1920a

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Verbatim text: Sargent, C. S. 1920. Crataegus ser. Aestivales. In: Notes on North American Trees. VI. J. Arnold Arbor. 1: 248–252.
Author: Sargent, C.S.
Year: 1920
Title: Crataegus ser. Aestivales.
Source: Notes on North American Trees. VI
Journal: J. Arnold Arbor.
Volume: 1
Pages: 248–252