Rhododendron calendulaceum 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.
Rhododendron calendulaceum was also determined to be a tetraploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.
Summary of Ploidy Levels
Tetraploid Rhododendron calendulaceum,
Tetraploid Rhododendron calendulaceum var. croceum,
Tetraploid Rhododendron calendulaceum 'Cherokee',
Tetraploid Rhododendron calendulaceum 'Smoky Mountaineer'
Source: Longwood Garden Accession Number: 2001-0273-B
Source: Connecticut College Arboretum Accession Number: 80-7-D
Source: Connecticut College Arboretum Accession Number: 81-71-J
Source: Highstead Arboretum Accession Number: 93-80-G
Source: Arnold Arboretum Accession Number: 857-2-A
Source: Audra State Park, West Virginia
Source: Joe Bruso
John and Sally Perkins
