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This web site shows drawings of Crataegus by Knud Ib Christensen; they were reproduced from his "Revision of Crataegus Sect. Crataegus and Nothosect. Crataeguineae (Rosaceae-Maloideae) in the Old World" (1992, Systematic Botany Monographs, Volume 35). [Editorial staff vifabio]
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