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  1. By: Hubert, Ernest E
    Type: Article
    In: Botanical gazette
    Volume: 74
    Issue: 3
    Date: 1922
    Page Range: 333--334
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991
  2. By: Weir, James R. (James Robert), - Hubert, Ernest E
    Type: Article
    In: American journal of botany
    Volume: 4
    Issue: 6
    Date: 1917-06
    Page Range: 327--335
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-