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  1. By: Hertrich, William,
    Type: Article
    In: Lasca leaves
    Volume: 5
    Issue: Autumn 1955
    Date: 1955
    Page Range: 86-87
    Publication Info: Arcadia, Calif, California Arboretum Foundation, 1950-1976
    Subjects: Huntington Botanical Gardens  Idria columnaris
  2. By: Holmes, Nelson
    Type: Article
    In: Arboretum News
    Volume: 1999:summer
    Date: 1999
    Page Range: 3
    Publication Info: Arcadia, Calif California Arboretum Foundation 1993
    Subjects: Beaucarnea stricta  Ceanothus  Idria columnaris  Leucophyllum frutescens  Quercus engelmannii