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  1. By: Shevock, James R. - Spence, John R - Stark, Lloyd R.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 52
    Date: 2005
    Page Range: 66--71
    Publication Info: Berkeley California Botanical Society
  2. By: Spence, John R - Stark, Lloyd R. - Shevock, James R.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 53
    Date: 2006
    Page Range: 400--403
    Publication Info: Berkeley California Botanical Society
  3. By: Spence, John R - Kellman, Kenneth
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 62
    Date: 2015
    Page Range: 124--135
    Publication Info: Berkeley California Botanical Society