'Lady Eleanor Cathcart' is a Diploid

Rhododendron 'Lady Eleanor Cathcart', which is a 1850 John Waterer hybrid documented as R. maximum x R. arboreum, 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.

Summary of Ploidy Levels

Diploid 'Lady Eleanor Cathcart'

Source: Jane Brooks

John and Sally Perkins

'Gartendirektor Rieger' is a Triploid

Rhododendron 'Gartendirektor Rieger', which is a Hobbie hybrid documented as 'Adriaan Koster' x R. williamsianum, has been determined to be a triploid 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.

Summary of Ploidy Levels

Triploid 'Gartendirektor Rieger'

Source: Jane Brooks

John and Sally Perkins