'Magic' is a Tetraploid

Rhododendron 'Magic', which is a Mezitt Ghent, has been determined to be a tetraploid 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

Tetraploid 'Magic'

Source: Planeview Nursery

John and Sally Perkins

'Siskin' is a Tetraploid

Rhododendron 'Siskin', which is a Waterer Knaphill documented as a crossed between Rhododendron luteum and Rhododendron molle, has been determined to be a tetraploid 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 Rhododendron molle,
Tetraploid Rhododendron luteum,
Tetraploid 'Siskin'

Source: Planeview Nursery

John and Sally Perkins

'Orange Carpet' is a Diploid

Rhododendron 'Orange Carpet', which is a natural hybrid collected in 1962 from Allatoona Lake, GA registered by Earl Sommerville documented as containing Rhododendron flammeum and Rhododendron calendulaceum, has been determined to be a diploid 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.

Based soley on the ploidy evidence, Rhododendron 'Orange Carpet' may not have Rhododendron calendulaceum in its parentage.

Summary of Ploidy Levels

Diploid Rhododendron flammeum,
Diploid Rhododendron 'Orange Carpet',
Tetraploid Rhododendron calendulaceum

Source: Planeview Nursery

John and Sally Perkins

'Razzberry' is a Diploid

Rhododendron 'Razzberry', which is a natural hybrid collected in 1962 from Allatoona Lake, GA registered by Earl Sommerville documented as containing Rhododendron flammeum and Rhododendron periclymenoides, has been determined to be a diploid 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 Rhododendron flammeum,
Diploid Rhododendron periclymenoides,
Diploid Rhododendron 'Razzberry'

Source: Planview Nursery

John and Sally Perkins

'Pink Ember' is a Diploid

Rhododendron 'Pink Ember', which is a Earl Sommerville hybrid documented as (Rhododendron cumberlandense x Rhododendron viscosum) x Rhododendron arborescens, has been determined to be a diploid 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 Rhododendron arborescens,
Diploid Rhododendron cumberlandense,
Diploid Rhododendron viscosum,
Diploid Rhododendron 'Pink Ember'

Source: Planview Nursery

John and Sally Perkins

'Earl's Gold' Is a Tetraploid

Rhododendron 'Earl's Gold', which is a Earl Sommerville introduction documented as Rhododendron austrinum or austrinum hybrid, has been determined to be a tetraploid 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

Triploid 'Evening Sun',
Tetraploid Rhododendron austrinum,
Tetraploid 'Earl's Gold',
Tetraploid 'Sommerville Sunrise'

Source: Planview Nursery

John and Sally Perkins