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  1. By: Friesner, Ray C
    Type: Article
    In: Botanical gazette
    Volume: 66
    Issue: 4
    Date: 1918
    Page Range: 383--385
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  2. By: Friesner, Ray C
    Type: Article
    In: American journal of botany
    Volume: 7
    Issue: 9
    Date: 1920-11
    Page Range: 380--407
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-