http://rosebayblog.blogspot.com/2011/03/northern-hi-lights-is-tetraploid.html

H: Saturday, March 12, 2011

'Northern Hi-Lights' is a Tetraploid

Rhododendron 'Northern Hi-Lights', which is in the Northern Lights group from the University of Minnesota documented as Rhododendron atlanticum X 'Dayton Red', has been determined to be a tetraploid 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 'Northern Hi-Lights' is fertile.

Summary of Ploidy Levels

Diploid Rhododendron 'Orchid Lights',
Tetraploid Rhododendron atlanticum,
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
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