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  1. By: Mclean, Forman T - Merrill, Elmer D. (Elmer Drew), - Rusby, H H - Small, J K - Britton, Nathaniel Lord, - Trelease, Helen M - Haynes, Caroline C
    Type: Article
    In: Torreya
    Volume: 32
    Issue: 1
    Date: 1932
    Page Range: 18--27
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  2. By: Trelease, Sam Farlow, - Trelease, Helen M
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 44
    Issue: 527
    Date: 1943-11
    Page Range: 254--260
    Publication Info: Lancaster, Pa, Published for the Garden by the New Era Printing Co, 1900-