Rhododendron 'Hotei', which is a Karl Sifferman hybrid documented as 'Goldsworth Orange' x (souliei x wardii var. wardii), 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 'Hotei' is pollen sterile.
Summary of Ploidy Levels
Diploid 'Hotei'
Source Marc Colombel
John and Sally Perkins
