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  1. By: Douglas, Gertrude E.
    Type: Article
    In: Torreya
    Volume: 6
    Issue: 8
    Date: 1906
    Page Range: 157--165
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  2. By: Douglas, Gertrude E.
    Type: Article
    In: American journal of botany
    Volume: 3
    Issue: 6
    Date: 1916-06
    Page Range: 319--335
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  3. By: Douglas, Gertrude E.
    Type: Article
    In: American journal of botany
    Volume: 5
    Issue: 1
    Date: 1918-01
    Page Range: 36--54
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  4. By: Douglas, Gertrude E.
    Type: Article
    In: Botanical gazette
    Volume: 70
    Issue: 3
    Date: 1920
    Page Range: 211--220
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991