Rhododendron 'Unique', which is a Ghent hybrid, 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.
Rhododendron 'Unique' was determined to be a tetraploid using flow cytometry by Tom Eeckhaut.
Summary of Ploidy Levels
Source: Arnold Arboretum Accession Number: 72-57-B
John and Sally Perkins