Rhododendron 'The Honourable Jean Marie de Montague', which is a van Nes hybrid documented as R. griffithianum hybrid, 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 'The Honourable Jean Marie de Montague' is a parent of 'Anita Gehnrich','Grace Seabrook', 'Hallelujah', 'Solidarity', 'Taurus', and 'Very Berry' which are triploids.
Rhododendron 'The Honourable Jean Marie de Montague' appears to produce unreduced gametes in larger numbers than most diploids.
Summary of Ploidy Levels
Diploid 'Anna',
Diploid 'The Honourable Jean Marie de Montague',
Diploid 'Wild Affair',
Triploid 'Anita Gehnrich',
Triploid 'Grace Seabrook',
Triploid 'Hallelujah',
Triploid 'Solidarity',
Triploid 'Taurus',
Triploid 'Very Berry'
Source: Greer Gardens
John and Sally Perkins
