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  1. By: Showalter, Amos M
    Type: Article
    In: Botanical gazette
    Volume: 72
    Issue: 4
    Date: 1921
    Page Range: 245--249
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  2. By: Showalter, Amos M
    Type: Article
    In: American journal of botany
    Volume: 10
    Issue: 3
    Date: 1923-03
    Page Range: 148--166
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  3. By: Showalter, Amos M
    Type: Article
    In: American journal of botany
    Volume: 10
    Issue: 4
    Date: 1923-04
    Page Range: 170--172
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-