Rhododendron 'Deep Rose', which is an Ed Mezitt Ghent hybrid documented as Rhododendron arborescens (possibly cumberlandense) X red Ghent, has been determined to be a triploid 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.
To date all Ghents have tested as triploid or tetraploid.
Summary of Ploidy Levels
Diploid Rhododendron arborescens,
Diploid Rhododendron cumberlandense,
Triploid 'Bronze Unique',
Triploid 'Daviesii',
Triploid 'Deep Rose',
Triploid 'Gloria Mundi',
Triploid 'Graf von Meran',
Triploid 'Josephine Klinger'
Source: George Hibben
John and Sally Perkins
