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  1. By: Panero, José L. - Villaseñor Ríos, José - Medina-Lemos, Rosalinda
    Type: Article
    In: Contributions from the University of Michigan Herbarium
    Volume: 19
    Date: 1993
    Page Range: 171--193
    Publication Info: Ann Arbor, University Herbarium, University of Michigan, 1939-