'Pink Puff' is a Diploid

Rhododendron 'Pink' Puff', which is a natural hybrid of Rhododendron arborescens and Rhododendron cumberlandense, has been determined to be a diploid 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.

Summary of Ploidy Levels

Diploid Rhododendron arborescens,
Diploid Rhododendron cumberlandense,
Diploid Rhododendron arborescens X Rhododendron cumberlandense,
Diploid Rhododendron cumberlandense X Rhododendron rborescens,
Diploid 'Pink Puff'

Source: Connecticut College Arboretum

John and Sally Perkins

Rhododendron viscosum var. serrulatum is a Diploid

Rhododendron viscosum var. serrulatum 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 viscosum 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 viscosum,
Diploid Rhododendron viscosum forma rhodanthum,
Diploid Rhododendron viscosum var. serrulatum

Source: Connecticut College Arboretum Accession Number: 90-7-A

John and Sally Perkins

Rhododendron prunifolium is a Diploid

Rhododendron prunifolium 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 prunifolium,
Diploid Rhododendron prunifolium 'David Ellis'

Source: Arnold Arboretum Accession Number: 85-D
Source: Connecticut College Arboretum Accession Number: 83-39-A

John and Sally Perkins

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 flammeum is a Diploid

Rhododendron flammeum 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 flammeun,
Diploid Rhododendron flammeum 'Brick Ruffles',
Diploid Rhododendron flammeum 'Harry's Speciosum',
Diploid Rhododendron flammeum 'Hazel Hamilton'

Source: Connecticut College Arboretum Accession Number: 85-3-B

John and Sally Perkins

Rhododendron catawbiense is a Diploid

Rhododendron catawbiense has been determined to be a diploid 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.

Summary of Ploidy Levels

Diploid Rhododendron catawbiense,
Diploid Rhododendron maximum

Source: Connecticut College Arboretum

John and Sally Perkins

"Coleman's May Pink" is a Tetraploid

Rhododendron colemanii "Coleman's May Pink" has 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.

Summary of Ploidy Levels

Tetraploid Rhododendron colemanii,
Tetraploid Rhododendron colemanii "Coleman's May Pink"

Source: Connecticut College Arboretum

John and Sally Perkins

Rhododendron minus is a Diploid

Rhododendron minus 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.

No naturally occurring tetraploid Rhododendron minus have been located to date. Rhododendron minus 'Epoch', which was chemically treated to increase the ploidy level, is a tetraploid.

Summary of Ploidy Levels

Diploid Rhododendron minus,
Diploid Rhododendron minus 'Blanchette',
Diploid Rhododendron minus 'Mitchell Dam',
Diploid Rhododendron minus var. chapmanii,
Tetraploid 'Epoch'

Source: Arnold Arboretum Accession Number: 483-81-A
Source: Connecticut College Arboretum Accession Number: 81-28-C

John and Sally Perkins

Rhododendron atlanticum is a Tetraploid

Rhododendron atlanticum 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 atlanticum 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 atlanticum,
Tetraploid Rhododendron atlanticum 'Winterthur'

Source: Connecticut College Arboretum Accession Number: 81-81-F
Source: Connecticut College Arboretum Accession Number: 81-81-L
Source: Longwood Gardens Accession Number: 2008-0224-E
Source: George Hibben

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 arborescens is a Diploid

Rhododendron arborescens 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 arborescens 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 arborescens,
Diploid Rhododendron arborescens Pink Form,
Diploid Rhododendron arborescens Yellow Form Gable

Source: Arnold Arboretum Accession Number: 858-Mass
Source: Connecticut College Arboretum
Source: Audra State Park, West Virginia
Source: Joe Bruso

John and Sally Perkins

Rhododendron cumberlandense is a Diploid

Rhododendron cumberlandense 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 cumberlandense 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 cumberlandense

Source: Arnold Arboretum Accession Number: 419-97-D
Source: Connecticut College Arboretum Accession Number: 81-72-D
Source: Joe Bruso

John and Sally Perkins

Rhododendron periclymenoides is a Diploid

Rhododendron periclymenoides 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 periclymenoides tested was from a wild population located near Hamden, Connecticut.

Summary of Ploidy Levels

Diploid Rhododendron periclymenoides,
Diploid Rhododendron periclymenoides 'Appalachian Spring',
Diploid Rhododendron periclymenoides 'Doug Horegan'

Source: George Hibben
Source: Audra State Park, West Virginia
Source: Broken Arrow Nursery
Source: Connecticut College Arboretum Accession Number: 81-90-B
Source: Connecticut College Arboretum Accession Number: 81-90-E
Source: Longwood Gardens Accession Number: 2002-0208-B

John and Sally Perkins