Rhododendron 'Orchid Lights', which is in the Northern Lights group from the University of Minnesota documented as Rhododendron canadense X Rhododendron x kosteranum, has been determined to be a diploid using flow cytometry by
Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, 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 x kosteranum is documented as having been derived from Rhododendron molle.
Summary of Ploidy Levels
Diploid Rhododendron canadense
Diploid Rhododendron molle
Diploid Rhododendron 'Orchid Lights'
Tetraploid 'Apricot Surprise',
Tetraploid 'Candy Lights',
Tetraploid 'Golden Lights',
Tetraploid 'Lemon Lights',
Tetraploid 'Mandarin Lights',
Tetraploid 'Northern Hi-Lights',
Tetraploid 'Tri-Lights'
Source: John and Sally Perkins
John and Sally Perkins
