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  1. By: Xolocotzi, Efraim Hernandez
    Type: Article
    In: Botanical Museum leaflets, Harvard University
    Volume: 13
    Issue: 7
    Date: 1949-01-17
    Page Range: 153--211
    Publication Info: Cambridge, Mass Botanical Museum, Harvard University 1932-
  2. By: Cave, Marion S., - Xolocotzi, Efraim Hernandez
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 14
    Date: 1958
    Page Range: 248--248
    Publication Info: Berkeley, California Botanical Society,