Two plants labeled Rhododendron viscosum X Rhododendron arborescens have 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 contain Rhododendron atlanticum. Both of thedse plants were raised by George Hibben.
Summary of Ploidy Levels
Diploid Rhododendron viscosum,
Diploid Rhododendron arborescens,
Tetraploid Rhododendron atlanticum,
Tetraploid "(Rhododendron viscosum X Rhododendron arborescens) not"
Source: Arnold Arboretum Accession Number: 139-98-A
Source: George Hibben
John and Sally Perkins
