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  1. By: Cannon, John F. M. (John Francis Michael), - Theobald, William L.
    Type: Article
    In: Mitteilungen der Botanischen Staatssammlung München
    Volume: 6
    Date: 1966
    Page Range: 479--482
    Publication Info: Munich, H. Merxmüller, [1950]-1991 [i.e. 1992]
  2. By: Mathias, Mildred Esther, - Constance, Lincoln, - Theobald, William L.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 20
    Date: 1969
    Page Range: 214--219
    Publication Info: Berkeley, California Botanical Society,