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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Stevens, Warren
    Type: Article
    In: Rhodora
    Volume: 41
    Date: 1939
    Page Range: 260--262
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Stevens, Warren - Agra, Maria de Fátima
    Type: Article
    In: Novon a journal of botanical nomenclature from the Missouri Botanical Garden
    Volume: 6
    Date: 1996
    Page Range: 6--8
    Publication Info: St. Louis, MO, Missouri Botanical Garden,