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  1. By: Cleland, Ralph E
    Type: Article
    In: Annals of botany
    Volume: 33
    Date: 1919-07
    Page Range: 323--351
    Publication Info: London, Academic Press [etc.],
  2. By: Collins, Frank S. (Frank Shipley), - Cleland, Ralph E
    Type: Article
    In: Rhodora
    Volume: 20
    Date: 1918
    Page Range: 141--145
    Publication Info: [Cambridge, Mass., etc.] New England Botanical Club [etc.]
  3. By: Cleland, Ralph E
    Type: Article
    In: American journal of botany
    Volume: 9
    Issue: 7
    Date: 1922-07
    Page Range: 391--413
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-