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  1. By: Cockerell, Theodore D. A. (Theodore Dru Alison), - Harper, R M
    Type: Article
    In: Torreya
    Volume: 19
    Issue: 10
    Date: 1919
    Page Range: 197--199
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  2. By: Harper, R M
    Type: Article
    In: Rhodora
    Volume: 31
    Date: 1929
    Page Range: 221--223
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],