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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Higgins, B. B.
    Type: Article
    In: American journal of botany
    Volume: 7
    Issue: 10
    Date: 1920-12
    Page Range: 435--444
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-