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  1. By: Duggar, Benjamin M. (Benjamin Minge), - Armstrong, Joanne Karrer
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 12
    Date: 1925
    Page Range: 359--366
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-
  2. By: Duggar, Benjamin M. (Benjamin Minge), - Armstrong, Joanne Karrer
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 10
    Date: 1923
    Page Range: 191--212
    Publication Info: St. Louis, Missouri Botanical Garden Press, 1914-