Rhododendron alabamense is a Diploid

Rhododendron alabamense has been determined to be a diploid 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 Rhododendron alabamense,
Diploid Rhododendron alabamense 'Schwinds'

Source: Connecticut College Arboretum Accession Number: 81-84-A
Source: Connecticut College Arboretum Accession Number: 85-2-A
Source: Connecticut College Arboretum Accession Number: 85-2-C
Source: Highstead Arboretum Accession Number: 94-6-L
Source: Woodlanders

John and Sally Perkins

Rhododendron austrinum is a Tetraploid

Rhododendron austrinum 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 austrinum 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 austrinum,
Tetraploid Rhododendron austrinum Album Form,
Tetraploid Rhododendron austrinum 'Millie Mac'

Source: Arnold Arboretum Accession Number: 1403-86-A
Source: Connecticut College Arboretum Accession Number: 81-79-C
Source: Highstead Arboretum Accession Number: 93-79-K

John and Sally Perkins

Rhododendron calendulaceum is a Tetraploid

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

Rhododendron canescens is a Diploid

Rhododendron canescens has been determined to be a diploid 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 canescens was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.

Summary of Ploidy Levels

Diploid Rhododendron canescens

Source: Arnold Arboretum Accession Number: 166-90-B
Source: Highstead Arboretum Accession Number: 93-82-V
Source: Highstead Arboretum Accession Number: 93-82-W
Source: Longwood Gardens

John and Sally Perkins