Rhododendron 'Summer Peach', which is a Jim Barlup hybrid documented as 'Whitney's Late Peach' X 'Phyllis Korn', 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.
Rhododendron 'Summer Peach' has as ancestors 'Broughtonii', 'Pink Pearl', 'Gomer Waterer', and 'Phyllis Korn' which are all triploids. 'Summer Peach' has as descendants 'Peach Recital' and 'Summer Wind' which are both diploids.
Summary of Ploidy Levels
Diploid 'Diane',
Diploid 'Madame Carvalho',
Diploid 'Mrs. Lindsay Smith',
Diploid 'Peach Recital',
Diploid 'Summer Peach',
Diploid 'Summer Wind',
Triploid 'Broughtonii',
Triploid 'Gomer Waterer',
Triploid 'Phyllis Korn',
Triploid 'Pink Pearl'
Source: Whitney Nursery
John and Sally Perkins
