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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Humphrey, Robert R
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 3
    Date: 1936
    Page Range: 348--352
    Publication Info: Berkeley, California Botanical Society,
  2. By: Humphrey, Robert R
    Type: Article
    In: Torreya
    Volume: 31
    Issue: 4
    Date: 1931
    Page Range: 101--109
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945