'Dame Nellie Melba' is a Triploid

Rhododendron 'Dame Nellie Melba', which is 1926 Sir Edmund Loder hybrid documented as 'Standishii' x R. arboreum ssp arboreum, 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 'Dame Nellie Melba'

Source: John Thornton

John and Sally Perkins

'Loderi Venus' is a Diploid

Rhododendron 'Loderi Venus', which is a Sir Edmund Loder hybrid documented as R. fortunei ssp. fortunei x R. griffithianum, 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.

Although Rhododendron griffithianum is in the background of several polyploid elepidote hybrids, many diploid hybrids also contain this species.

Summary of Ploidy Levels

Diploid 'Loderi Venus',
Triploid 'Markeeta’s Flame',
Triploid 'Markeeta’s Prize'

Source: Whitney Nursery

John and Sally Perkins