'Northern Starburst' is a Tetraploid

Rhododendron 'Northern Starburst', which is a Brigg's chemically treated 'PJM', 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 dauricum,
Diploid Rhododendron minus,
Tetraploid 'Northern Starburst'

Source: Rarefind Nursery

John and Sally Perkins

'Epoch' X augustinii is a Tetraploid

Rhododendron 'Epoch' X Rhododendron augustinii, which is a Kehr 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 'April Rhapsody',
Triploid 'Bluenose',
Triploid 'Purple Gem',
Tetraploid 'Blue Baron',
Tetraploid 'Blue Ridge',
Tetraploid 'Epoch',
Tetraploid 'Epoch' X Rhododendron augustinii,
Tetraploid "Medium Blue",
Tetraploid Rhododendron augustinii

Source: RareFind Nursery

John and Sally Perkins

[Treated 'Nancy Evans'] X 'Point Defiance' is a Tetraploid

One seedling of [Briggs chemically treated Rhododendron 'Nancy Evans'] X Rhododendron 'Point Defiance', which was raised by Ned Brockenbrough, has been determined to be a tetraploid 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 'Nancy Evans'
Tetraploid 'Point Defiance'
Tetraploid 1 Seedling of [treated 'Nancy Evans'] X 'Point Defiance'

Source: Ned Brockenbrough

John and Sally Perkins

'Brigg's Red Star' x 'Point Defiance' is a Tetraploid

Two seedlings of Rhododendron 'Brigg's Red Star' x 'Point Defiance', which were raised by Ned Brockenbrough, have been determined to be a tetraploid 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

Tetraploid 'Brigg's Red Star'
Tetraploid 'Point Defiance'
Tetraploid 2 Seedlings of 'Brigg's Red Star' x 'Point Defiance'

Source: Ned Brockenbrough

John and Sally Perkins

'Briggs Red Star' is a Tetraploid

Rhododendron 'Briggs Red Star', which is a chemically treated 'The Honourable Jean Marie de Montague' produced by Briggs, has been determined to be a tetraploid 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.

Ranney, Jones, and Lynch found 'Brigg's Red Star' to be a 2x + 4x mixaploid which breeds as a tetraploid having tetraploid pollen.

Summary of Ploidy Levels

Diploid 'The Honourable Jean Marie de Montague',
Tetraploid 'Brigg's Red Star'

Source: Ned Brockenbrough

John and Sally Perkins

'Epoch' is a Tetraploid

Rhododendron minus 'Epoch', which is a Augie Kehr chemically treated Rhododendron minus, has been determined to be a tetraploid 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 Rhododendron minus,
Tetraploid Rhododendron minus 'Epoch'

Source: John and Sally Perkins

John and Sally Perkins

'Kehr's White Ruffles' is a Triploid

Rhododendron 'Kehr's White Ruffles', which is August Kehr hybrid documented as R. minus var. minus 'Epoch' x R. mucronulatum, 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.

In the case of triploid 'Kehr's White Ruffles', a suspected tetraploid crossed with a diploid produced a triploid indicating that normal reduced meiosis most likely occurred for both parents. In other words, 'Kehr's White Ruffles' having 39 chromosomes received 26 chromosomes from the suspected tetraploid 'Epoch' and 13 chromosomes from the diploid R. mucronulatum.

Summary of Ploidy Levels

Triploid 'Angel Powder',
Triploid 'Kehr's White Ruffles'

Source: John and Sally Perkins

John and Sally Perkins

'Angel Powder' is a Fertile Triploid

Rhododendron 'Angel Powder', which is Weldon Delp hybrid documented as R. minus var. minus 'Epoch' x R. mucronulatum var. mucronulatum, 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.

Werner Brack has germinated open pollinated seed collected from 'Angel Powder'. 'Angel Powder' is the first documented fertile triploid lepidote.

In the case of triploid 'Angel Powder', a tetraploid crossed with a diploid produced a triploid indicating that normal reduced meiosis most likely occurred for both parents. In other words, 'Angel Powder' having 39 chromosomes received 26 chromosomes from the tetraploid 'Epoch' and 13 chromosomes from the diploid R. mucronulatum.

Summary of Ploidy Levels

Triploid 'Angel Powder',
Triploid 'Kehr's White Ruffles',
Tetraploid R. minus var. minus 'Epoch'

Source: John and Sally Perkins

John and Sally Perkins

'Summer Joy' is a Tetraploid

Rhododendron maximum 'Summer Joy', which is a Augie Kehr chemically treated Rhododendron maximum has been determined to be a tetraploid 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 Rhododendron maximum,
Tetraploid Rhododendron maximum 'Summer Joy'

Source: Rarefind Nursery

John and Sally Perkins