'Praxitèle' is an Aneuploid?

Rhododendron 'Praxitèle', which is a 1888 L. de Smet Ghent hybrid, has been determined to be a aneuploid falling between the triploid and tetraploid ranges 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 'Miniatum Floribundum',
Triploid 'Aida',
Triploid 'Bronze Unique',
Triploid 'Croceum Tricolor',
Triploid 'Daviesii',
Triploid 'Deep Rose',
Triploid 'Freya',
Triploid 'Gloria Mundi',
Triploid 'Il Tasso',
Triploid 'Josephine Klinger',
Triploid 'Phebe',
Triploid 'Phidias',
Triploid 'Pontica Album',
Triploid 'Van Houttei Flore Pleno',
Triploid 'Velasquez',
Triploid/Tetraploid 'Praxitèle',
Tetraploid 'Admiraal De Ruyter',
Tetraploid 'Altaclerensis',
Tetraploid 'Ariel',
Tetraploid 'Beaté Céleste',
Tetraploid 'Bijou des Amateurs',
Tetraploid 'Bouquet de Flore',
Tetraploid 'Cardinal,
Tetraploid 'Comte de Flandre',
Tetraploid 'Corneille',
Tetraploid 'Directeur Charles Baumann',
Tetraploid 'Durante Alle',
Tetraploid 'Electum',
Tetraploid 'Eugénie',
Tetraploid 'Fénelon',
Tetraploid 'Flameola Incarnata',
Tetraploid 'Héroine Plena,
Tetraploid 'Heureuse Surprise',
Tetraploid 'Hollandia',
Tetraploid 'Hora',
Tetraploid 'Ignacea',
Tetraploid 'Igneum Novum',
Tetraploid 'Il Tasso',
Tetraploid 'Jenny Lind',
Tetraploid 'Juliana Nova',
Tetraploid 'Julius Caesar',
Tetraploid 'Leibuir',
Tetraploid 'Lelia',
Tetraploid 'Madame Gustave Guillemot',
Tetraploid 'Marie Verschaffelt',
Tetraploid 'Minerva',
Tetraploid 'Nancy Waterer',
Tetraploid 'Oscar I',
Tetraploid 'Perfecta',
Tetraploid 'Raphael de Smet'

Source: Azaleatuin

John and Sally Perkins

'Arneson's Gem' is a Tetraploid

Rhododendron 'Arneson's Gem', which appears to contain Rhododendron molle and an exbury azalea, 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.

The Perkins's Pollen Based Ploidy Test indicated that 'Arneson's Gem' was most likely a tetraploid.

Rhododendron 'Arneson's Gem' is pollen fertile but appears to be seed sterile. 'Chickasaw', which was found by Clarence Towe in the wild and was determined by Dr. Thomas Ranney and Nathan Lynch to be a tetraploid using flow cytometry, is seed fertile but produces no pollen.

These fertility issues may indicate that both of these tetraploid hybrids, one man made and the other occurring naturally in the wild, are aneuploids having a chromosome count near tetraploid.

Summary of Ploidy Levels

Diploid Rhododendron molle
Tetraploid 'Arneson's Gem'
Tetraploid 'Chickasaw'

Source: John and Sally Perkins

John and Sally Perkins