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  1. By: Stewart, Ralph R
    Type: Article
    In: Torreya
    Volume: 24
    Issue: 3
    Date: 1924
    Page Range: 41--44
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  2. By: Stewart, Ralph R
    Type: Article
    In: Torreya
    Volume: 15
    Issue: 12
    Date: 1915
    Page Range: 251--260
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945
  3. By: Stewart, Ralph R
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 45
    Issue: 537
    Date: 1944-09
    Page Range: 199--207
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-