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  1. By: Ferren, Wayne R. - Bleck, John. - Vivrette, Nancy
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 28
    Date: 1981
    Page Range: 80--85
    Publication Info: Berkeley California Botanical Society
  2. By: Vivrette, Nancy - Ferren, Wayne R. - Mahall, Bruce
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 46
    Date: 1999
    Page Range: 222--223
    Publication Info: Berkeley California Botanical Society