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  1. By: Robison, Ramona - Ditomaso, Joseph M
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 57
    Date: 2010
    Page Range: 85--94
    Publication Info: Berkeley, California Botanical Society,
  2. By: Constantine-Shull, Helen - Rice, Barry A. - Robison, Ramona - Randall, John M - Felger, Richard Stephen - Christy, John A. (John Ashton), - Zika, Peter F.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 47
    Date: 2000
    Page Range: 209--216
    Publication Info: Berkeley, California Botanical Society,