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  1. By: Wiggans, R. G. (Roy Glen),
    Publication info: Ithaca, 1921
    Holding Institution: Library of Congress
  2. By: Wiggans, R. G. (Roy Glen),
    Publication info: [Ithaca, N. Y.], 1915
    Holding Institution: Cornell University Library
  1. By: Wiggans, R. G. (Roy Glen),
    Type: Article
    In: American journal of botany
    Volume: 8
    Issue: 1
    Date: 1921-01
    Page Range: 30--40
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-