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  1. By: Whitkus, Richard
    Publication info: Edmonton, University of Alberta, Dept. of Botany, 1981
    Holding Institution: University of Alberta Library
  1. By: Whitkus, Richard
    Type: Article
    In: Rhodora
    Volume: 83
    Date: 1981
    Page Range: 461--464
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Lowrey, Tim - Whitkus, Richard
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 56
    Date: 2009
    Page Range: 297--297
    Publication Info: Berkeley, California Botanical Society,
  3. By: Lowrey, Tim - Whitkus, Richard
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 58
    Date: 2011
    Page Range: 279--279
    Publication Info: Berkeley, California Botanical Society,
  4. By: Ritter, Matt - Whitkus, Richard
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 59
    Date: 2012
    Page Range: 235--235
    Publication Info: Berkeley, California Botanical Society,
  5. By: Ritter, Matt - Whitkus, Richard
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 60
    Date: 2013
    Page Range: 362--362
    Publication Info: Berkeley, California Botanical Society,
  6. By: Lowrey, Tim - Whitkus, Richard
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 57
    Date: 2010
    Page Range: 277--277
    Publication Info: Berkeley, California Botanical Society,