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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Stekel, Peter
    Type: Article
    In: Crossosoma
    Volume: 6
    Issue: 6
    Date: 1980-12
    Page Range: 1--4
    Publication Info: Claremont, CA, Southern California Botanists, Rancho Santa Ana Botanic Garden,
  2. By: Billings, W. D. (William Dwight), - Stekel, Peter - Cope, Edward A.,
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 25
    Date: 1978
    Page Range: 174--176
    Publication Info: Berkeley, California Botanical Society,