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  1. By: Ward, Darrell - Spellenberg, Richard W
    Type: Article
    In: Phytologia.
    Volume: 61
    Issue: 2
    Date: 1986
    Page Range: 119--125
    Publication info: Bronx Park, New York,H.A. Gleason and H.N. Moldenke,
  2. By: Bartel, Jim A - Ward, Darrell - Spellenberg, Richard - Cochrane, Theodore S - Armstrong, Wayne P - Hamon, Dan
    Type: Article
    In: Madroño; a West American journal of botany.
    Volume: 28
    Date: 1981
    Page Range: 184--188
    Publication info: Berkeley,California Botanical Society.