Rhododendron 'Frosthexe', which is a Reich hybrid documented as Rhododendron anthopogon ssp. anthopogon X Rhododendron lapponicum, has been determined to be a triploid using flow cytometry by
Dr. João Loureiro, Dr. Silvia Castro, 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 hippophaeoides,
Diploid Rhododendron keiskei,
Diploid Rhododendron lapponicum,
Diploid Rhododendron micranthum,
Diploid Rhododendron minus,
Diploid Rhododendron mucronulatum,
Diploid Rhododendron racemosum,
Triploid 'Angel Powder',
Triploid 'April Rhapsody',
Triploid 'Bluenose',
Triploid 'Evening Sky',
Triploid 'Frosthexe',
Triploid 'Kehr's White Ruffles',
Triploid 'Purple Gem',
Triploid 'Ramapo',
Triploid 'Ramolet',
Triploid 'Veesprite',
Tetraploid Rhododendron augustinii,
Tetraploid Rhododendron minus var. minus 'Epoch'
Source: Kristian Theqvist
John and Sally Perkins
