One seedling of Rhododendron 'Horizon Monarch' X ('Lem's Monarch' X 'Very Berry'), which was raised by Marc Colombel, has been determined to be a tetraploid 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 the tetraploid seedling of 'Horizon Monarch' (4X) X ('Lem's Monarch' (4X) X 'Very Berry' (4X)), a tetraploid was produced having 3 triploid and 7 tetraploid ancestors.
Summary of Ploidy Levels
Diploid 'Anna',
Diploid 'Hotei',
Diploid 'Lem's Cameo',
Diploid 'Nancy Evans',
Diploid 'Norman Gill',
Diploid 'The Honorable Jean Marie de Montague',
Triploid 'Broughtonii',
Triploid 'Cynthia',
Triploid 'Pink Pearl',
Tetraploid 'Countess of Derby',
Tetraploid 'Horizon Monarch',
Tetraploid 'Lem's Monarch',
Tetraploid 'Marinus Koster',
Tetraploid 'Point Defiance'
Tetraploid 'Trude Webster',
Tetraploid 'Very Berry'
Tetraploid 1 Seedling of 'Horizon Monarch' X ('Lem's Monarch' X 'Very Berry')
Source Marc Colombel
John and Sally Perkins
