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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ensign, M. R.
    Type: Article
    In: American journal of botany
    Volume: 8
    Issue: 9
    Date: 1921-11
    Page Range: 433--441
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  2. By: Ensign, M. R.
    Type: Article
    In: American journal of botany
    Volume: 6
    Issue: 8
    Date: 1919-10
    Page Range: 311--329
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-