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  1. By: Schaack, Clark George - Goodwin, Gregory A. - Morefield, James D - Hirshberg, Jerilyn - Levin, Geoffrey A - Bourell, Mona - Daniel, Thomas Franklin - León de la Luz, José Luis.
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 35
    Date: 1988
    Page Range: 278--280
    Publication Info: Berkeley, California Botanical Society,
  2. By: Hirshberg, Jerilyn - Clemons, Duffie
    Type: Article
    In: Phytologia
    Volume: 81
    Date: 1996
    Page Range: 69--102
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke