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  1. By: Mcgregor, Ronald L
    Type: Article
    In: Phytologia
    Volume: 55
    Issue: 4
    Date: 1984
    Page Range: 227--228
    Publication Info: Bronx Park, New York H.A. Gleason and H.N. Moldenke
  2. By: Mcgregor, Ronald L - Magrath, Lawrence K - Weedon, Ronald R.,
    Type: Article
    In: Rhodora
    Volume: 74
    Date: 1972
    Page Range: 378--388
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Mcgregor, Ronald L
    Type: Article
    In: Rhodora
    Volume: 62
    Date: 1960
    Page Range: 93--95
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Morse, Caleb A - Freeman, Craig Carl - Mcgregor, Ronald L
    Type: Article
    In: Journal of the Botanical Research Institute of Texas
    Volume: 1
    Date: 2007
    Page Range: 753--761
    Publication Info: Fort Worth, Tex, Botanical Research Institute of Texas, 2007-
  5. By: Mcgregor, Ronald L
    Type: Article
    In: Rhodora
    Volume: 62
    Date: 1960
    Page Range: 116--116
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  6. By: Mcgregor, Ronald L - Harms, Vernon L - Poindexter, Jerold D
    Type: Article
    In: Rhodora
    Volume: 63
    Date: 1961
    Page Range: 146--148
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  7. By: Freeman, Craig Carl - Morse, Caleb A - Mcgregor, Ronald L
    Type: Article
    In: SIDA, contributions to botany
    Volume: 20
    Date: 2003
    Page Range: 1289--1297
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-
  8. By: Mcgregor, Ronald L
    Type: Article
    In: The University of Kansas science bulletin
    Volume: 37
    Date: 1955
    Page Range: 55--141
    Publication Info: [Lawrence], University of Kansas, [1926-1996]
  9. By: Freeman, Craig Carl - Mcgregor, Ronald L - Morse, Caleb A
    Type: Article
    In: SIDA, contributions to botany
    Volume: 18
    Date: 1998
    Page Range: 593--604
    Publication Info: [Dallas, W. F. Mahler, etc.], 1962-