Rhododendron 'Kehr's White Ruffles', which is August Kehr hybrid documented as R. minus var. minus 'Epoch' x R. mucronulatum, 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.
In the case of triploid 'Kehr's White Ruffles', a suspected tetraploid crossed with a diploid produced a triploid indicating that normal reduced meiosis most likely occurred for both parents. In other words, 'Kehr's White Ruffles' having 39 chromosomes received 26 chromosomes from the suspected tetraploid 'Epoch' and 13 chromosomes from the diploid R. mucronulatum.
Summary of Ploidy Levels
Triploid 'Angel Powder',
Triploid 'Kehr's White Ruffles'
Source: John and Sally Perkins
John and Sally Perkins
