Rhododendron 'Mother of Pearl', which is documented as a sport of 'Pink Pearl', 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.
Summary of Ploidy Levels
Diploid 'Mother of Pearl',
Triploid 'Broughtonii',
Triploid ''Ebony Pearl',
Triploid 'Topsvoort Pearl',
Triploid 'Pink Pearl'
Source: Whitney Nursery
John and Sally Perkins
