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  1. By: Burton, Philip J. - Robertson, Kenneth Ray, - Dennis, Ann - Robertson, Kenneth Ray,
    Edition: 2nd ed.
    Publication info: [Champaign, Ill.] (607 E. Peabody Dr., Champaign 61820), [Section of Botany and Plant Pathology, Illinois Natural History Survey], [1989]
    Holding Institution: University Library, University of Illinois Urbana Champaign
  1. By: Trevor, Miles - Burton, Philip J.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 113
    Issue: 3
    Date: 1999
    Page Range: 396--400
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Burton, Philip J.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 115
    Issue: 4
    Date: 2001
    Page Range: 719--720
    Publication Info: Ottawa Ottawa Field-Naturalists' Club