Rhododendron "alabamense not" is a Tetraploid

A plant labeled Rhododendron alabamense 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.

The ploidy test indicates this plant may instead be Rhododendron colemanii.

Summary of Ploidy Levels

Diploid Rhododendron alabamense,
Tetraploid Rhododendron colemanii,
Tetraploid Rhododendron "alabamense not"

Source: Rarefind Nursery

John and Sally Perkins

"Speciosum Yellow #3" is a Tetraploid

Rhododendron "Speciosum Yellow #3" 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.

Clearly Rhododendron "Speciosum Yellow #3" is not straight Rhododendron flammeun.

Summary of Ploidy Levels

Diploid Rhododendron flammeun,
Tetraploid "Speciosum Yellow #3"

Source: Rarefind Nursery

John and Sally Perkins

"Looye's Blue" is a Tetraploid

Rhododendron "Looye's Blue", which is a Jack and Jackie Looye 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

Tetraploid Looye's Blue"

Source: Rarefind Nursery

John and Sally Perkins

'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

keiskei X (spinuliferum X keiskei) is a Diploid

Rhododendron keiskei X (Rhododendron spinuliferum X Rhododendron keiskei) 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 keiskei,
Diploid Rhododendron keiskei X (Rhododendron spinuliferum X Rhododendron keiskei)

Source: Rarefind Nursery

John and Sally Perkins

"Medium Blue" is a Tetraploid

Rhododendron "Medium Blue", which is a Rhododendron augustinii hybrid under evaluation by Rarefind Nursery, 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

'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

'Blue Baron' is a Tetraploid

Rhododendron 'Blue Baron', which is a Mezitt hybrid documented as ['Starry Night' ('Gletschernacht') x 'Waltham'], 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.

Some question whether Rhododendron 'Blue Baron' has Rhododendron 'Waltham' as the pollen parent.

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

'Blue Ridge' is a Tetraploid

Rhododendron 'Blue Ridge', which is a Haag hybrid documented as 'Russautinii' X Rhododendron augustinii, 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

'Pink Prelude' is a Diploid

Rhododendron 'Pink Prelude', which is a Watson hybrid documented as ('Sarita Loder' x Rhododendron calophytum) x Rhododendron macabeanum, 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 'Pink Prelude'

Source: RareFind Nursery

John and Sally Perkins

'Evening Sun' is a Triploid

Rhododendron 'Evening Sun', which is a Earl Sommerville introduction documented as Rhododendron austrinum or austrinum hybrid, has been determined to be a triploid 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: RareFind Nursery

John and Sally Perkins

'Dawn's Early Light' is a Diploid

Rhododendron 'Dawn's Early Light', which is documented as a Rhododendron keiskei X Rhododendron xanthocodon, 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.

Both documented parents of Rhododendron 'Dawn's Early Light' are yellow, and the resemblance to Rhododendron keiskei is completely obvious, but there is little other evidence of the Rhododendron xanthocodon parent.

Summary of Ploidy Levels

Diploid Rhododendron keiskei,
Diploid 'Dawn's Early Light'

Source: RareFind Nursery

John and Sally Perkins

Rhododendron calostrotum X carolinanum is a Diploid

Rhododendron calostrotum X Rhododendron minus Carolinanum Group 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 minus,
Diploid Rhododendron calostrotum X Rhododendron minus Group Carolinanum,
Diploid 'Robert Seleger'

Source: RareFind Nursery

John and Sally Perkins

'Robert Seleger' is a Diploid

Rhododendron 'Robert Seleger', which is a Dietrich Hobbie hybrid documented as a Rhododendron calostrotum ssp. keleticum hybrid, 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 calostrotum X Rhododendron minus Group Carolinanum,
Diploid 'Robert Seleger'

Source: RareFind Nursery

John and Sally Perkins

'Windbeam' is a Diploid

Rhododendron 'Windbeam', which is a 1934 Nearing hybrid documented as a 'Conestoga' hybrid, 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.

In 1977 at Breeders Roundtable in Eugene, Oregon, Ellis Jones presented several reasons he suspected that 'Windbeam' was a triploid. In 1979, Gustav A. L. Mehlquist reported that 'Windbeam' was fertile.

Summary of Ploidy Levels

Diploid Rhododendron minus,
Diploid Rhododendron racemosum,
Diploid 'Manitou',
Diploid 'Windbeam'

Source: RareFind Nursery

John and Sally Perkins

'Bluenose' is a Triploid

Rhododendron 'Bluenose', which is a Brueckner hybrid documented as Rhododendron dauricum var. sempervirens X 'Russautinii' has been determined to be a triploid 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,
Triploid 'April Rhapsody',
Triploid 'Bluenose',
Triploid 'Purple Gem',
Tetraploid Rhododendron augustinii

Source: RareFind Nursery

John and Sally Perkins

'April Rhapsody' is a Triploid

Rhododendron 'April Rhapsody', which is a Allan and Shirley Anderson hybrid documented as 'April Gem' x 'Vibrant Violet', has been determined to be a triploid 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,
Triploid 'April Rhapsody',
Triploid 'Bluenose',
Triploid 'Purple Gem',
Tetraploid Rhododendron augustinii

Source: RareFind Nursery

John and Sally Perkins

'Caramou' is a Diploid

Rhododendron 'Caramou', which is a Hardgrove hybrid documented as Rhododendron minus Carolinianum Group x Rhododendron moupinense, 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 minus,
Diploid 'Caramou'

Source: RareFind Nursery

John and Sally Perkins

'Isola Bella' is a Diploid

Rhododendron 'Isola Bella', which is a Brueckner hybrid documented as (Rhododendron dauricum 'Arctic Pearl' selfed) X Rhododendron fletcherianum 'Yellow Bunting', 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 dauricum,
Diploid 'Isola Bella'

Source: RareFind Nursery

John and Sally Perkins

'Lemon Twist' is a Diploid

Rhododendron 'Lemon Twist', which is a Rokuyo hybrid documented as Rhododendron keiskei var. ozawae x Rhododendron lutescens 'Bagshot Sands', 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 keiskei,
Diploid 'Lemon Twist'

Source: RareFind Nursery

John and Sally Perkins