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  1. By: Frye, Theodore C. (Theodore Christian), - Rigg, George B. (George Burton) - Crandall, W C
    Type: Article
    In: Botanical gazette
    Volume: 60
    Issue: 6
    Date: 1915
    Page Range: 473--482
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991