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  1. By: Royen, P. van (Pieter) - Steenis, C. G. G. J. van (Cornelis Gijsbert Gerrit Jan)
    Type: Article
    In: Journal of the Arnold Arboretum
    Volume: 33
    Issue: 1
    Date: 1952
    Page Range: 91--95
    Publication Info: Cambridge, Mass Arnold Arboretum, Harvard University [etc.] 1919-
  2. By: Royen, P. van (Pieter)
    Type: Article
    In: The Gardens' bulletin, Singapore
    Volume: 22
    Series: 4
    Issue: 1
    Date: 1967
    Page Range: 33--39
    Publication Info: Singapore, Govt. Print. Off. [etc.],
  3. By: Brass, L. J. (Leonard John), - Croft, James R. - Darwin, Steven P. - Essig, Frederick Monroe, - Frodin, D G - Hoogland, Ruurd D. - Hoover, W Scott - Howcroft, N H S - Katik, Paul - Koster, Josephine Therese - Leenhouts, Pieter Willem - Markgraf, Friedrich - Marsh, J. - Nakaike, Toshiyuki - Symon, D. E. (David E.), - Ham, Raymond van der - Royen, P. van (Pieter) - Verdcourt, Bernard
    Type: List
    In: Plant lists : Australia, Papua New Guinea, and the United States
    Date: 1919-1961