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  1. By: Levin, G A - Mulroy, Thomas W.
    Type: Article
    In: Transactions of the San Diego Society of Natural History
    Volume: 21
    Date: 1985
    Page Range: 57--70
    Publication Info: [San Diego], The Society, 1905-1989
  2. By: Levin, G A
    Type: Article
    In: Rhodora
    Volume: 101
    Date: 1999
    Page Range: 217--233
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],