Rhododendron 'Hallelujah', which is a Harold Greer hybrid documented as 'The Honourable Jean Marie de Montague' x 'Kimberly', has been determined to be a triploid using flow cytometry by
Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, 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 'The Honourable Jean Marie de Montague',
Triploid 'Hallelujah'
Source: Greer Gardens
Source: Bob Fox
John and Sally Perkins
