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  1. By: Johnston, Earl S
    Type: Article
    In: American journal of botany
    Volume: 6
    Issue: 9
    Date: 1919-11
    Page Range: 373--379
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  2. By: Johnston, Earl S
    Type: Article
    In: Botanical gazette
    Volume: 74
    Issue: 3
    Date: 1922
    Page Range: 314--319
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  3. By: Johnston, Earl S
    Type: Article
    In: American journal of botany
    Volume: 9
    Issue: 3
    Date: 1922-03
    Page Range: 93--98
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-