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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Kondratieff, Boris C - Okane, S L - Schaal, Barbara A.
    Type: Article
    In: Rhodora
    Volume: 95
    Date: 1993
    Page Range: 254--260
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],