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  1. By: Simpson, Michael G - Hasenstab-Lehman, Kristen E
    Type: Article
    In: Crossosoma
    Volume: 35
    Issue: 1
    Date: 2009
    Page Range: 1--59
    Publication Info: Claremont, CA, Southern California Botanists, Rancho Santa Ana Botanic Garden,
  2. By: Simpson, Michael G - Rebman, Jon Paul - Hasenstab-Lehman, Kristen E - Guilliams, C. Matt - Mcconnell, Patrick O
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 60
    Date: 2013
    Page Range: 24--34
    Publication Info: Berkeley, California Botanical Society,