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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Klaphaak, Peter J. - Bartlett, Harley Harris,
    Type: Article
    In: American journal of botany
    Volume: 9
    Issue: 8
    Date: 1922-10
    Page Range: 446--458
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-