Rhododendron periclymenoides 'Doug Horegan' has been determined to be a diploid using flow cytometry by
Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
Plant Ecology and Evolution Group,
Centre for Functional Ecology,
Department of Life Sciences,
Faculty of Science and Technology,
University of Coimbra, Portugal.
Rhododendron periclymenoides was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.
Summary of Ploidy Levels
Diploid Rhododendron periclymenoides,
Diploid Rhododendron periclymenoides 'Appalachian Spring',
Diploid Rhododendron periclymenoides 'Doug Horegan'
Source: Longwood Gardens
John and Sally Perkins
