tag:blogger.com,1999:blog-260398552024-03-21T17:53:06.950-07:00Rosebay BlogAmerican Rhododendron Society Massachusetts Chapter Rosebay BlogUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comBlogger641999tag:blogger.com,1999:blog-26039855.post-72780193350542505932011-11-01T07:50:00.000-07:002012-01-29T09:46:48.899-08:00'Lilac Lights' is a DiploidRhododendron 'Lilac Lights', which is in the Northern Lights group from the University of Minnesota documented as <em>Rhododendron canadense</em> X <em>Rhododendron molle</em> hybrid, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron canadense</em>,<br />Diploid <em>Rhododendron molle</em>,<br />Diploid <em>Rhododendron prinophyllum</em>,<br />Diploid 'Frank Abbott',<br />Diploid 'Jane Abbott',<br />Diploid 'Lilac Lights',<br />Diploid 'Orchid Lights',<br />Diploid 'Rosy Lights',<br />Triploid 'Spicy Lights',<br />Triploid 'White Lights',<br />Tetraploid <em>Rhododendron atlanticum</em>,<br />Tetraploid <em>Rhododendron calendulaceum</em>,<br />Tetraploid <em>Rhododendron luteum</em>,<br />Tetraploid 'Apricot Surprise',<br />Tetraploid 'Candy Lights',<br />Tetraploid 'Golden Lights',<br />Tetraploid 'Lemon Lights',<br />Tetraploid 'Mandarin Lights',<br />Tetraploid 'Northern Hi-Lights',<br />Tetraploid 'Tri-Lights'<br /><br />Source: Kristian Theqvist<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-64289366752245606872011-10-28T09:11:00.000-07:002012-01-29T09:46:48.912-08:00'Rosy Lights' is a DiploidRhododendron 'Rosy Lights', which is in the Northern Lights group from the University of Minnesota documented as <em>Rhododendron prinophyllum</em> X <em>Rhododendron molle</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron canadense</em>,<br />Diploid <em>Rhododendron molle</em>,<br />Diploid <em>Rhododendron prinophyllum</em>,<br />Diploid 'Frank Abbott',<br />Diploid 'Jane Abbott',<br />Diploid 'Lilac Lights',<br />Diploid 'Orchid Lights',<br />Diploid 'Rosy Lights',<br />Triploid 'Spicy Lights',<br />Triploid 'White Lights',<br />Tetraploid <em>Rhododendron atlanticum</em>,<br />Tetraploid <em>Rhododendron calendulaceum</em>,<br />Tetraploid <em>Rhododendron luteum</em>,<br />Tetraploid 'Apricot Surprise',<br />Tetraploid 'Candy Lights',<br />Tetraploid 'Golden Lights',<br />Tetraploid 'Lemon Lights',<br />Tetraploid 'Mandarin Lights',<br />Tetraploid 'Northern Hi-Lights',<br />Tetraploid 'Tri-Lights'<br /><br />Source: Kristian Theqvist<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-64030214983881292022011-10-20T01:39:00.000-07:002012-01-29T09:46:48.960-08:00"(cumberlandense X lutem) not" is a DiploidThree seedlings of Rhododendron "(cumberlandense X lutem) not" have been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Ploidy testing indicates that <em>Rhododendron luteum</em> may not be the pollen parent of this hybrid.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron cumberlandense</em>,<br />Diploid 3 Seedlings of "(cumberlandense X luteum) not",<br />Tetraploid <em>Rhododendron luteum</em><br /><br />Source: Bruce Clyburn<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-64060863580456638352011-10-19T01:34:00.000-07:002012-01-29T09:46:48.971-08:00"(flammeum X calendulaceum) not" is a DiploidRhododendron "(flammeum X calendulaceum) not", which is a John Thornton hybrid, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Ploidy testing indicates that <em>Rhododendron calendulaceum</em> may not be the pollen parent of this hybrid.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron flammeum</em>,<br />Diploid "(flammeum X calendulaceum) not",<br />Tetraploid <em>Rhododendron calendulaceum</em><br /><br />Source: John Thronton<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-21443780308139549982011-10-18T01:30:00.000-07:002012-01-29T09:46:48.983-08:00'Consul Pecher' is a DiploidRhododendron 'Consul Pecher', which is a <em>Rhododendron molle</em> hybrid, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron molle</em>,<br />Diploid 'Consul Pecher'<br /><br />Source: Arnold Arboretum Accession Number: 837-59<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-70063389756381350152011-10-17T01:27:00.000-07:002012-01-29T09:46:48.994-08:00"Between Two Roads" is a DiploidRhododendron "Between Two Roads" has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid "Between Two Roads"
<br />
<br />Source: Mike Creel
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-63460219486111958342011-10-16T01:21:00.000-07:002012-01-29T09:46:49.005-08:00'Creel's Confetti' is a DiploidRhododendron 'Creel's Confetti' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid 'Creel's Confetti' <br /><br />Source: Mike Creel<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-33038254731415916892011-10-15T01:19:00.000-07:002012-01-29T09:46:49.016-08:00'Creel's Alabammy' is a DiploidRhododendron 'Creel's Alabammy', which is a natural hybrid of <em>Rhododendron alabamense</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron alabamense</em>,<br />Diploid 'Creel's Alabammy'<br /><br />Source: Mike Creel<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-36416585719635134302011-10-14T01:59:00.000-07:002012-01-29T09:46:49.029-08:00'Creekside' is a DiploidRhododendron 'Creekside', which is a natural hybrid of <em>Rhododendron arborescens</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Rhododendron 'Creekside' may, also, contain <em>Rhododendron viscosum</em>. Rhododendron 'Creekside' is sometimes called "Running Arborescens".<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron arborescens</em>,<br />Diploid <em>Rhododendron viscosum</em>,<br />Diploid 'Creekside'<br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-506078325756569602011-10-13T01:41:00.000-07:002012-01-29T09:46:49.040-08:00'Pink Puff' is a DiploidRhododendron 'Pink' Puff', which is a natural hybrid of <em>Rhododendron arborescens</em> and <em>Rhododendron cumberlandense</em>, has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron arborescens</em>,
<br />Diploid <em>Rhododendron cumberlandense</em>,
<br />Diploid <em>Rhododendron arborescens</em> X <em>Rhododendron cumberlandense</em>,
<br />Diploid <em>Rhododendron cumberlandense</em> X <em>Rhododendron rborescens</em>,
<br />Diploid 'Pink Puff'
<br />
<br />Source: Connecticut College Arboretum
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-15724346157546353842011-10-12T01:39:00.000-07:002012-01-29T09:46:49.051-08:00cumberlandense X arborescens is a Diploid<em>Rhododendron cumberlandense</em> X <em>Rhododendron arborescens</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron arborescens</em>,<br />Diploid <em>Rhododendron cumberlandense</em>,<br />Diploid <em>Rhododendron arborescens</em> X <em>Rhododendron cumberlandense</em>,<br />Diploid <em>Rhododendron cumberlandense</em> X <em>Rhododendron rborescens</em>,<br />Diploid 'Pink Puff'<br /><br />Source: George Hibben<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-29133898801442006532011-10-11T01:35:00.000-07:002012-01-29T09:46:49.062-08:00arborescens X cumberlandense is a Diploid<em>Rhododendron arborescens</em> X <em>Rhododendron cumberlandense</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron arborescens</em>,<br />Diploid <em>Rhododendron cumberlandense</em>,<br />Diploid <em>Rhododendron arborescens</em> X <em>Rhododendron cumberlandense</em>,<br />Diploid <em>Rhododendron cumberlandense</em> X <em>Rhododendron rborescens</em>,<br />Diploid 'Pink Puff'<br /><br />Source: George Hibben<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-58559503568815050972011-10-10T01:55:00.000-07:002012-01-29T09:46:49.074-08:00'Toy' is a DiploidRhododendron 'Toy', which is a Polly Hill selection, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid 'Toy'<br /><br />Source: George Hibben<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-7719489336915714452011-10-09T01:06:00.000-07:002012-01-29T09:46:49.086-08:00'Casille' is a DiploidRhododendron 'Casille' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />The Pastel series which includes 'Casille' is documented to contain <em>Rhododendron alabamense</em>, <em>Rhododendron canescens</em>, and <em>Rhododendron flammeum</em>.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron alabamense</em>,<br />Diploid <em>Rhododendron canescens</em>,<br />Diploid <em>Rhododendron flammeum</em>,<br />Diploid 'Casille',<br />Diploid "Pastel #6",<br />Diploid "Pastel #7",<br />Diploid "Pastel #20"<br /><br />Source: Woodlanders Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-66491927266727760322011-09-19T01:50:00.000-07:002012-01-29T09:46:49.314-08:00"Pastel #20" is a Diploid"Pastel #20" has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />The Pastel series is documented to contain <em>Rhododendron alabamense</em>,<br /><em>Rhododendron canescens</em>, and <em>Rhododendron flammeum</em>.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron alabamense</em>,<br />Diploid <em>Rhododendron canescens</em>,<br />Diploid <em>Rhododendron flammeum</em>,<br />Diploid 'Casille',<br />Diploid "Pastel #6",<br />Diploid "Pastel #7",<br />Diploid "Pastel #20"<br /><br />Source: Woodlanders Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-52509446659194842332011-09-18T01:49:00.000-07:002012-01-29T09:46:49.325-08:00"Pastel #7" is a Diploid"Pastel #7" has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />The Pastel series is documented to contain <em>Rhododendron alabamense</em>,<br /><em>Rhododendron canescens</em>, and <em>Rhododendron flammeum</em>.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron alabamense</em>,<br />Diploid <em>Rhododendron canescens</em>,<br />Diploid <em>Rhododendron flammeum</em>,<br />Diploid 'Casille',<br />Diploid "Pastel #6",<br />Diploid "Pastel #7",<br />Diploid "Pastel #20"<br /><br />Source: Woodlanders Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-25953836983329350092011-09-17T01:47:00.000-07:002012-01-29T09:46:49.336-08:00"Pastel #6" is a Diploid"Pastel #6" has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />The Pastel series is documented to contain <em>Rhododendron alabamense</em>,<br /><em>Rhododendron canescens</em>, and <em>Rhododendron flammeum</em>.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron alabamense</em>,<br />Diploid <em>Rhododendron canescens</em>,<br />Diploid <em>Rhododendron flammeum</em>,<br />Diploid 'Casille',<br />Diploid "Pastel #6",<br />Diploid "Pastel #7",<br />Diploid "Pastel #20"<br /><br />Source: Woodlanders Nursery<br /><br />John and Sally Perkins<strong></strong>Diploid 'Casille',USAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-16082392635020746442011-09-03T01:58:00.001-07:002012-01-29T09:46:49.499-08:00Rhododendron viscosum forma rhodanthum is a Diploid<em>Rhododendron viscosum forma rhodanthum</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron viscosum forma rhodanthum</em> appears to be a natural hybrid most likely containing <em>Rhododendron cumberlandense</em>.<br /><br /><em>Rhododendron viscosum</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron cumberlandense</em>,<br />Diploid <em>Rhododendron viscosum</em>,<br />Diploid <em>Rhododendron viscosum forma rhodanthum</em>,<br />Diploid <em>Rhododendron viscosum var. serrulatum</em><br /><br />Source: Arnold Arboretum Accession Number: 638-62<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-51994305598568323002011-09-02T01:55:00.000-07:002012-01-29T09:46:49.510-08:00Rhododendron viscosum var. serrulatum is a Diploid<em>Rhododendron viscosum var. serrulatum</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron viscosum</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron viscosum</em>,<br />Diploid <em>Rhododendron viscosum forma rhodanthum</em>,<br />Diploid <em>Rhododendron viscosum var. serrulatum</em><br /><br />Source: Connecticut College Arboretum Accession Number: 90-7-A<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-67741746798784598282011-08-28T01:24:00.000-07:002012-01-29T09:46:49.588-08:00Rhododendron arborescens Pink Form is a Diploid<strong></strong><em>Rhododendron arborescens</em> Pink Form has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron arborescens</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron arborescens</em>,<br />Diploid <em>Rhododendron arborescens</em> Pink Form,<br />Diploid <em>Rhododendron arborescens</em> Yellow Form Gable<br /><br />Source: George Hibben<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-42957089843004925402011-08-26T01:48:00.000-07:002012-01-29T09:46:49.614-08:00Rhododendron periclymenoides 'Appalachian Spring' is a Diploid<em>Rhododendron periclymenoides</em> 'Appalachian Spring' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron periclymenoides</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron periclymenoides</em>,<br />Diploid <em>Rhododendron periclymenoides</em> 'Appalachian Spring',<br />Diploid <em>Rhododendron periclymenoides</em> 'Doug Horegan'<br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-65190472852656800282011-08-23T01:21:00.000-07:002012-01-29T09:46:49.654-08:00Rhododendron prunifolium is a Diploid<em>Rhododendron prunifolium</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron prunifolium</em>,<br />Diploid <em>Rhododendron prunifolium</em> 'David Ellis'<br /><br />Source: Arnold Arboretum Accession Number: 85-D<br />Source: Connecticut College Arboretum Accession Number: 83-39-A <br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-25242341815158167552011-08-22T01:43:00.000-07:002012-01-29T09:46:49.666-08:00Rhododendron alabamense is a Diploid<em>Rhododendron alabamense</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron alabamense</em>,<br />Diploid <em>Rhododendron alabamense</em> 'Schwinds'<br /><br />Source: Connecticut College Arboretum Accession Number: 81-84-A<br />Source: Connecticut College Arboretum Accession Number: 85-2-A <br />Source: Connecticut College Arboretum Accession Number: 85-2-C<br />Source: Highstead Arboretum Accession Number: 94-6-L<br />Source: Woodlanders<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-46264554603954951582011-08-21T01:31:00.000-07:002012-01-29T09:46:49.679-08:00Rhododendron flammeum is a Diploid<em>Rhododendron flammeum</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron flammeun</em>,<br />Diploid <em>Rhododendron flammeum</em> 'Brick Ruffles',<br />Diploid <em>Rhododendron flammeum</em> 'Harry's Speciosum',<br />Diploid <em>Rhododendron flammeum</em> 'Hazel Hamilton'<br /><br />Source: Connecticut College Arboretum Accession Number: 85-3-B<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-69888726863632473362011-07-30T05:26:00.000-07:002012-01-29T09:46:49.964-08:00Rhododendron arborescens Yellow Form Gable is a Diploid<em>Rhododendron arborescens</em> Yellow Form Gable has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron arborescens</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron arborescens</em>,<br />Diploid <em>Rhododendron arborescens</em> Pink Form,<br />Diploid <em>Rhododendron arborescens</em> Yellow Form Gable<br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-35347699297250789842011-07-16T01:17:00.000-07:002012-01-29T09:46:50.128-08:00'Miniatum Floribundum' is a DiploidRhododendron 'Miniatum Floribundum', which is a prior to 1855 Alexander Verschaffelt Ghent hybrid, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />To date 'Miniatum Floribundum' is the only Ghent hybrid that has tested as diploid. 'Miniatum Floribundum' appears to bloom later than most Ghent hybrids.<br /><br />'Miniatum Floribundum' is often referred to as 'Miniata Floribunda' or Rhododendron miniatum floribundum indicating this may be a natural hybrid rather than a man made hybrid.<br /><br />Summary of Ploidy Levels<br /><br />Diploid 'Miniatum Floribundum',<br />Triploid 'Aida',<br />Triploid 'Bronze Unique',<br />Triploid 'Croceum Tricolor',<br />Triploid 'Daviesii',<br />Triploid 'Deep Rose',<br />Triploid 'Freya',<br />Triploid 'Gloria Mundi',<br />Triploid 'Il Tasso',<br />Triploid 'Josephine Klinger',<br />Triploid 'Phebe',<br />Triploid 'Phidias',<br />Triploid 'Pontica Album',<br />Triploid 'Van Houttei Flore Pleno',<br />Triploid 'Velasquez',<br />Tetraploid 'Admiraal De Ruyter',<br />Tetraploid 'Altaclerensis',<br />Tetraploid 'Ariel',<br />Tetraploid 'Beaté Céleste',<br />Tetraploid 'Bijou des Amateurs',<br />Tetraploid 'Bouquet de Flore',<br />Tetraploid 'Cardinal,<br />Tetraploid 'Comte de Flandre',<br />Tetraploid 'Corneille',<br />Tetraploid 'Directeur Charles Baumann',<br />Tetraploid 'Durante Alle',<br />Tetraploid 'Electum',<br />Tetraploid 'Eugénie',<br />Tetraploid 'Fénelon',<br />Tetraploid 'Flameola Incarnata',<br />Tetraploid 'Héroine Plena,<br />Tetraploid 'Heureuse Surprise',<br />Tetraploid 'Ignacea',<br />Tetraploid 'Julius Caesar',<br />Tetraploid 'Lelia',<br />Tetraploid 'Madame Gustave Guillemot',<br />Tetraploid 'Nancy Waterer',<br />Tetraploid 'Oscar I',<br />Tetraploid 'Raphael de Smet'<br /><br />Source: <a href="http://www.azaleatuin.be">Azaleatuin</a> <br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-47505020803014403662011-07-05T03:57:00.000-07:002012-01-29T09:46:50.251-08:00'Tang' is a DiploidRhododendron 'Tang', which is a 1952 David Leach hybrid documented as <em>Rhododendron cumberlandense</em> 'Scarlet Salute' x 'Red King' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Rhododendron 'Red King' is documented to be a mollis hybrid.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron cumberlandense</em>,<br />Diploid <em>Rhododendron molle</em>,<br />Diploid 'Tang'<br /><br />Source: Barlett Arboretum<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-32049081194632377402011-06-19T01:20:00.000-07:002012-01-29T09:46:50.452-08:00"Jane Abbott" is a Diploid<div style="TEXT-ALIGN: center"><br /><a href="http://2.bp.blogspot.com/_lREOGy4A5Yw/Swni2L8iAeI/AAAAAAAACs8/ArkiXlVBFk0/s1600/cemetary_abbotts.JPG"><img style="display:block; margin:0px auto 10px; text-align:center;cursor:pointer; cursor:hand;width: 320px; height: 240px;" src="http://2.bp.blogspot.com/_lREOGy4A5Yw/Swni2L8iAeI/AAAAAAAACs8/ArkiXlVBFk0/s320/cemetary_abbotts.JPG" border="0" alt=""id="BLOGGER_PHOTO_ID_5407102248182481378" /></a><br /><span style="font-size:12;"><br />2 Different "Jane Abbott"s (Frank Abbott) [2x]<br />Next to graves of Frank and Jane Abbott<br />S and J Perkins<br /></span></div><br /><br />Two different Rhododendron "Jane Abbott" types, which are a Frank Abbott hybrids documented as <em>Rhododendron prinophyllum</em> x 'Miss Louisa Hunnewell', have been determined to be diploids using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Frank Abbott started crossing <em>Rhododendron prinophyllum</em> and 'Miss Louisa Hunnewell' in the 1930's giving the best results of this cross the name Rhododendron "Jane Abbott" after his daughter. <br /><br />'Miss Louisa Hunnewell' is a <em>Rhododendron molle</em> resulting from the cross of the Japanese and Chinese form of the species. At one time, 'Miss Louisa Hunnewell' was considered to be the best <em>Rhododendron molle</em> in North America.<br /><br />Rhododendron "Jane Abbott" is rarely seed or pollen fertile. This lack of fertility may indicate that <em>Rhododendron molle</em> is not closely related to <em>Rhododendron prinophyllum</em>. Dr. Benjamin Hall's DNA has placed <em>Rhododendron molle</em> and <em>Rhododendron prinophyllum</em> in different clades and he suggests that <em>Rhododendron molle</em> DNA is closer to the tetraploid clade of deciduous azaleas than the diploid clade of deciduous azaleas.<br /><br />Rhododendron "Jane Abbott" is also difficult to root from cuttings.<br /><br />The two "Jane Abbott" tested are the 2 different "pinks" planted at the Saxton River cemetery next to the gravestones of Frank Abbott and his daughter Jane.<br /><br />Read <a href="http://rosebayblog.blogspot.com/2009/09/abbott-azaleas.html">Frank Abbott's Village of Azaleas"</a><br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron molle</em>,<br />Diploid <em>Rhododendron prinophyllum</em>, <br />Diploid 'Frank Abbott',<br />Diploid Two Different "Jane Abbott" types<br /><br />Source: John Abbott<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-68987583237860746342011-06-18T01:55:00.000-07:002012-01-29T09:46:50.478-08:00'Frank Abbott' is a DiploidRhododendron 'Frank Abbott', which is a Ed Mezitt hybrid documented as <em>Rhododendron molle</em> hybrid x <em>Rhododendron prinophyllum</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Frank Abbott started crossing <em>Rhododendron prinophyllum</em> and <em>Rhododendron molle</em> in the 1930's giving the best results of this cross the name Rhododendron 'Jane Abbott' after his daughter. When Ed Mezitt redid the cross thirty years later, Ed named one of his best results from the cross Rhododendron 'Frank Abbott'.<br /><br />Rhododendron 'Frank Abbott' is rarely seed or pollen fertile. This lack of fertility may indicate that <em>Rhododendron molle</em> is not closely related to <em>Rhododendron prinophyllum</em>. Dr. Benjamin Hall's DNA has placed <em>Rhododendron molle</em> and <em>Rhododendron prinophyllum</em> in different clades and he suggests that <em>Rhododendron molle</em> DNA is closer to the tetraploid clade of deciduous azaleas than the diploid clade of deciduous azaleas.<br /><br />Read <a href="http://rosebayblog.blogspot.com/2009/09/abbott-azaleas.html">Frank Abbott's Village of Azaleas"</a><br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron molle</em>,<br />Diploid <em>Rhododendron prinophyllum</em>, <br />Diploid 'Frank Abbott',<br />Diploid "Jane Abbott" types<br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-19458415533502698512011-05-16T06:23:00.000-07:002012-01-29T09:46:50.900-08:00'Orchid Lights' is a DiploidRhododendron 'Orchid Lights', which is in the Northern Lights group from the University of Minnesota documented as <em>Rhododendron canadense</em> X Rhododendron x kosteranum, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Rhododendron x kosteranum is documented as having been derived from <em>Rhododendron molle</em>.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron canadense</em><br />Diploid <em>Rhododendron molle</em><br />Diploid Rhododendron 'Orchid Lights'<br />Tetraploid 'Apricot Surprise',<br />Tetraploid 'Candy Lights',<br />Tetraploid 'Golden Lights',<br />Tetraploid 'Lemon Lights',<br />Tetraploid 'Mandarin Lights',<br />Tetraploid 'Northern Hi-Lights',<br />Tetraploid 'Tri-Lights'<br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-25842353504559420312011-05-09T01:20:00.000-07:002012-01-29T09:46:50.982-08:00'Orange Carpet' is a DiploidRhododendron 'Orange Carpet', which is a natural hybrid collected in 1962 from Allatoona Lake, GA registered by Earl Sommerville documented as containing <em>Rhododendron flammeum</em> and <em>Rhododendron calendulaceum</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Based soley on the ploidy evidence, Rhododendron 'Orange Carpet' may not have <em>Rhododendron calendulaceum</em> in its parentage. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron flammeum</em>,<br />Diploid Rhododendron 'Orange Carpet',<br />Tetraploid <em>Rhododendron calendulaceum</em><br /><br />Source: Planeview Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-25383423322617245402011-05-08T10:13:00.000-07:002012-01-29T09:46:50.994-08:00'Razzberry' is a DiploidRhododendron 'Razzberry', which is a natural hybrid collected in 1962 from Allatoona Lake, GA registered by Earl Sommerville documented as containing <em>Rhododendron flammeum</em> and <em>Rhododendron periclymenoides</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron flammeum</em>,<br />Diploid <em>Rhododendron periclymenoides</em>, <br />Diploid Rhododendron 'Razzberry'<br /><br />Source: Planview Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-88306952034284324312011-05-07T10:36:00.000-07:002012-01-29T09:46:51.005-08:00'Pink Ember' is a DiploidRhododendron 'Pink Ember', which is a Earl Sommerville hybrid documented as (<em>Rhododendron cumberlandense</em> x <em>Rhododendron viscosum</em>) x <em>Rhododendron arborescens</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron arborescens</em>, <br />Diploid <em>Rhododendron cumberlandense</em>,<br />Diploid <em>Rhododendron viscosum</em>, <br />Diploid Rhododendron 'Pink Ember'<br /><br />Source: Planview Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-70544924223470120442011-05-02T05:01:00.000-07:002012-01-29T09:46:51.063-08:00'June Jubilee' is a DiploidRhododendron 'June Jubilee', which is an Aromi hybrid, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid 'June Jubilee'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-55440505232023490972011-04-27T11:00:00.000-07:002012-01-29T09:46:51.118-08:00Rhododendron canescens 'Camilla's Blush' is a Diploid<em>Rhododendron canescens</em> 'Camilla's Blush', which is Beasley introduction, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron canescens</em>,<br />Diploid <em>Rhododendron canescens</em> 'Camilla's Blush'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-53476577164115492532011-04-26T11:06:00.000-07:002012-01-29T09:46:51.129-08:00'Memory of Fred Galle' is a DiploidRhododendron 'Memory of Fred Galle', which is a Kehr introduction, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid 'Memory of Fred Galle'<br /><br />Source: RareFind Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-82385003855048678532011-04-25T08:34:00.000-07:002012-01-29T09:46:51.141-08:00Rhododendron canescens 'Clyo Red' is a Diploid<em>Rhododendron canescens</em> 'Clyo Red' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca Oliveira, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron canescens</em>,<br />Diploid <em>Rhododendron canescens</em> 'Camilla's Blush',<br />Diploid <em>Rhododendron canescens</em> 'Clyo Red'<br /><br />Source: Woodlanders Nursery<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-16227761936780936772011-04-24T08:23:00.000-07:002012-01-29T09:46:51.153-08:00Rhododendron flammeum 'Brick Ruffles' is a Diploid<em>Rhododendron flammeum</em> 'Brick Ruffles' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron flammeun</em>,<br />Diploid <em>Rhododendron flammeum</em> 'Brick Ruffles',<br />Diploid <em>Rhododendron flammeum</em> 'Harry's Speciosum',<br />Diploid <em>Rhododendron flammeum</em> 'Hazel Hamilton'<br /><br />Source: Mike Creel<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-16853333247570126702011-04-23T08:20:00.000-07:002012-01-29T09:46:51.163-08:00Rhododendron eastmaii 'Charles Eastman' is a Diploid<em>Rhododendron eastmaii</em> 'Charles Eastman' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron eastmaii</em>,<br />Diploid <em>Rhododendron eastmaii</em> 'Charles Eastman',<br />Diploid <em>Rhododendron eastmaii</em> 'Crane Creek'<br /><br />Source: Mike Creel<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-62661500574882243182011-04-22T08:16:00.000-07:002012-01-29T09:46:51.174-08:00Rhododendron eastmaii 'Crane Creek' is a Diploid<em>Rhododendron eastmaii</em> 'Crane Creek' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron eastmaii</em>,<br />Diploid <em>Rhododendron eastmaii</em> 'Charles Eastman',<br />Diploid <em>Rhododendron eastmaii</em> 'Crane Creek'<br /><br />Source: Mike Creel<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-75750001281575264102011-04-21T08:05:00.000-07:002012-01-29T09:46:51.185-08:00'Pink 24' is a DiploidRhododendron 'Pink 24' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid 'Pink 24'<br /><br />Source: Mike Creel<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-65952029090229989802011-04-20T07:58:00.000-07:002012-01-29T09:46:51.196-08:00Rhododendron alabamense 'Schwind's Yellow' is a Diploid<em>Rhododendron alabamense</em> 'Schwind's Yellow' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron alabamense</em>,<br />Diploid <em>Rhododendron alabamense</em> 'Schwind's Yellow'<br /><br />Source: Mike Creel<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-40755016748705112332011-04-19T07:54:00.000-07:002012-01-29T09:46:51.208-08:00Rhododendron prunifolium 'David Ellis' is a Diploid<em>Rhododendron prunifolium</em> 'David Ellis' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron prunifolium</em>,<br />Diploid <em>Rhododendron prunifolium</em> 'David Ellis'<br /><br />Source: Mike Creel<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-41022552278345928802011-03-31T03:27:00.000-07:002012-01-29T09:46:51.424-08:00'Canobie Candy' X 'Hazel Hamilton' is a DiploidOne seedling of Rhododendron 'Canobie Candy' X <em>Rhododendron flammeum</em> 'Hazel Hamilton', which is Sally and John Perkins hybrid, has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br />In this case, a diploid crossed with a diploid produced a diploid (26 chromosomes) indicating normal meiosis occurred where each diploid parent contributed a 1x gamete (13 chromosomes). Diploid X diploid yielding diploid is the expected outcome.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron canescens</em>,
<br />Diploid <em>Rhododendron flammeum</em>,
<br />Diploid <em>Rhododendron flammeum</em> 'Hazel Hamilton',
<br />Diploid 'Canobie Candy',
<br />Diploid One seedling of 'Canobie Candy' X 'Hazel Hamilton'
<br />
<br />Source: Joe Bruso
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-4628524740079485992011-03-30T04:41:00.000-07:002012-01-29T09:46:51.436-08:00'Canobie Candy' is a DiploidRhododendron 'Canobie Candy', which is very likely a <em>Rhododendron canescens</em> hybrid seedling raised by Sally and John Perkins, has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br /><em>Rhododendron canescens</em> was determined to be a diploid.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron canescens</em>,
<br />Diploid 'Canobie Candy'
<br />
<br />Source: John and Sally Perkins
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-5846482939652865122011-03-08T01:30:00.000-08:002012-01-29T09:46:51.709-08:00Rhododendron flammeum 'Harry's Speciosum' is a Diploid<em>Rhododendron flammeum</em> 'Harry's Speciosum' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron flammeum</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron flammeun</em>,<br />Diploid <em>Rhododendron flammeum</em> 'Brick Ruffles',<br />Diploid <em>Rhododendron flammeum</em> 'Harry's Speciosum',<br />Diploid <em>Rhododendron flammeum</em> 'Hazel Hamilton'<br /><br />Source: Longwood Gardens<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-69528770105710185432011-03-03T13:23:00.000-08:002012-01-29T09:46:51.769-08:00Rhododendron periclymenoides 'Doug Horegan' is a Diploid<em>Rhododendron periclymenoides</em> 'Doug Horegan' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron periclymenoides</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron periclymenoides</em>,<br />Diploid <em>Rhododendron periclymenoides</em> 'Appalachian Spring',<br />Diploid <em>Rhododendron periclymenoides</em> 'Doug Horegan'<br /><br />Source: Longwood Gardens<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-28154515508055760052011-03-02T03:44:00.000-08:002012-01-29T09:46:51.780-08:00Rhododendron canescens 'Cedar Lane' is a Diploid<em>Rhododendron canescens</em> 'Cedar Lane' has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron canescens</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron canescens</em>,<br />Diploid <em>Rhododendron canescens</em> 'Cedar Lane'<br /><br />Source: Longwood Gardens<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-90522434468896061282011-02-22T03:31:00.000-08:002012-01-29T09:46:52.016-08:00Rhododendron albrectii is a Diploid<em>Rhododendron albrectii</em> has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron albrectii</em>
<br />
<br />Source: George Hibben
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-26561041822766641952011-02-04T18:09:00.000-08:002012-01-29T09:46:52.218-08:00Rhododendron schlippenbachii is a Diploid<em>Rhododendron schlippenbachii</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron schlippenbachii</em><br /><br />Source: Arnold Arboretum Accession Numner: 13432<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-74798462345197210902011-01-29T06:14:00.000-08:002012-01-29T09:46:52.285-08:00Rhododendron alabamense Yellow Form is a DiploidA yellow form of <em>Rhododendron alabamense</em> has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br /><em>Rhododendron alabamense</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron alabamense</em> Yellow form
<br />
<br />Source: John and Sally Perkins
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-90435561769247952882011-01-28T06:08:00.000-08:002012-01-29T09:46:52.296-08:00Rhododendron flammeum 'Hazel Hamilton' is a Diploid<em>Rhododendron flammeum</em> 'Hazel Hamilton' has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br /><em>Rhododendron flammeum</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron flammeun</em>,
<br />Diploid <em>Rhododendron flammeum</em> 'Brick Ruffles',
<br />Diploid <em>Rhododendron flammeum</em> 'Harry's Speciosum',
<br />Diploid <em>Rhododendron flammeum</em> 'Hazel Hamilton'
<br />
<br />Source: John and Sally Perkins
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-48239437699659280622011-01-27T17:39:00.000-08:002012-01-29T09:46:52.307-08:00Rhododendron canescens is a Diploid<em>Rhododendron canescens</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron canescens</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron canescens</em><br /><br />Source: Arnold Arboretum Accession Number: 166-90-B<br />Source: Highstead Arboretum Accession Number: 93-82-V<br />Source: Highstead Arboretum Accession Number: 93-82-W<br />Source: Longwood Gardens<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-30585550662234784392011-01-26T15:40:00.000-08:002012-01-29T09:46:52.319-08:00Rhododendron arborescens is a Diploid<em>Rhododendron arborescens</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron arborescens</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron arborescens</em>,<br />Diploid <em>Rhododendron arborescens</em> Pink Form,<br />Diploid <em>Rhododendron arborescens</em> Yellow Form Gable<br /><br />Source: Arnold Arboretum Accession Number: 858-Mass<br />Source: Connecticut College Arboretum <br />Source: Audra State Park, West Virginia<br />Source: Joe Bruso<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-12403477417235002742011-01-25T14:37:00.000-08:002012-01-29T09:46:52.330-08:00Rhododendron cumberlandense is a Diploid<em>Rhododendron cumberlandense</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron cumberlandense</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. <br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron cumberlandense</em><br /><br />Source: Arnold Arboretum Accession Number: 419-97-D<br />Source: Connecticut College Arboretum Accession Number: 81-72-D<br />Source: Joe Bruso<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-53437706343650669342011-01-24T05:36:00.000-08:002012-01-29T09:46:52.342-08:00Rhododendron canadense is a Diploid<em>Rhododendron canadense</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron canadense</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch. The Ranney research involved several samples from diverse wild populations including samples from Salem, New Hampshire.<br /><br />Read <a href="http://rosebayblog.blogspot.com/2008/11/ploidy-level-of-rhododendron.html">Ploidy Level of <em>Rhododendron canadense</em></a><br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron canadense</em>,<br />Diploid <em>Rhododendron canadense var. album</em><br />Diploid <em>Rhododendron canadense</em> 'Osku's Showy'<br /><br />Source: Arnold Arboretum Accession Number: 199-2006-C<br />Source: Bruce Clyburn<br />Source: John and Sally Perkins<br />Source: Kristian Theqvist<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-32098446926146673382011-01-23T01:39:00.000-08:002012-01-29T09:46:52.354-08:00Rhododendron molle is a Diploid<em>Rhododendron molle</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron molle</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron molle</em> Orange,<br />Diploid <em>Rhododendron molle</em> Yellow,<br />Diploid <em>Rhododendron molle ssp. japonicum</em>,<br />Diploid <em>Rhododendron molle ssp. molle</em><br /><br />Source: Arnold Aboretum<br />Source: Joe Bruso<br />Source: George Hibben<br />Source: Longwood Gardens Accession Number: 1994-0068-B<br />Source: Kristian Theqvist<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-10857862454677605722011-01-22T08:43:00.000-08:002012-01-29T09:46:52.365-08:00Rhododendron vaseyi is a Diploid<em>Rhododendron vaseyi</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron vaseyi</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron vaseyi</em><br /><br />Source: Arnold Arboretum Accession Number: 20953-Mass<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-1599550790417946522011-01-21T01:05:00.000-08:002012-01-29T09:46:52.377-08:00Rhododendron eastmanii is a Diploid<em>Rhododendron eastmanii</em> has been determined to be a diploid using flow cytometry by
<br />
<br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro
<br />Plant Ecology and Evolution Group,
<br />Centre for Functional Ecology,
<br />Department of Life Sciences,
<br />Faculty of Science and Technology,
<br />University of Coimbra, Portugal.
<br />
<br /><em>Rhododendron eastmanii</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.
<br />
<br />Summary of Ploidy Levels
<br />
<br />Diploid <em>Rhododendron eastmanii</em>
<br />
<br />Source: Joe Bruso
<br />
<br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-13949665992322388162011-01-16T01:36:00.000-08:002012-01-29T09:46:52.433-08:00Rhododendron periclymenoides is a Diploid<em>Rhododendron periclymenoides</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron periclymenoides</em> tested was from a wild population located near Hamden, Connecticut.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron periclymenoides</em>,<br />Diploid <em>Rhododendron periclymenoides</em> 'Appalachian Spring',<br />Diploid <em>Rhododendron periclymenoides</em> 'Doug Horegan'<br /><br />Source: George Hibben<br />Source: Audra State Park, West Virginia<br />Source: Broken Arrow Nursery<br />Source: Connecticut College Arboretum Accession Number: 81-90-B<br />Source: Connecticut College Arboretum Accession Number: 81-90-E<br />Source: Longwood Gardens Accession Number: 2002-0208-B<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-69993201897498014382011-01-12T01:00:00.000-08:002012-01-29T09:46:52.476-08:00R. calendulaceum x occidentale is a DiploidA seedling of Rhododendron <em>calendulaceum</em> x <em>occidentale</em>, which is a Oliver hybrid documented as <em>R. calendulaceum</em> 'Colossus' x <em>R. occidentale</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />A seedling of Rhododendron <em>calendulaceum</em> x <em>occidentale</em> being a diploid may indicate the seed parent was <em>R. cumberlandense</em> instead of <em>R. calendulaceum</em>. This seedling was determined to be both seed and pollen fertile by John and Sally Perkins. Moreover, this deciduous azalea seedling pollen tested as a diploid by accepting pollen from confirmed diploids.<br /><br />John and Sally Perkins suggest in the <a href="http://rosebayblog.blogspot.com/2009/12/rules-of-engagement.html">Rules of Engagement</a> that tetraploid X diploid crosses in deciduous azaleas are seldom result in seedpods.<br /><br /><em>Rhododendron cumberlandense</em> and <em>Rhododendron occidentale</em> are diploid species. <em>Rhododendron calendulaceum</em> is a tetraploid species.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>R. cumberlandense</em><br />Diploid <em>R. occidentale</em><br />Diploid <em>calendulaceum</em> x <em>occidentale</em><br />Tetraploid <em>R. calendulaceum</em><br /><br />Source: Dick Cavender<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-76784106896428023992011-01-01T01:00:00.000-08:002012-01-29T09:46:52.597-08:00Rhododendron viscosum is a Diploid<em>Rhododendron viscosum</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br /><em>Rhododendron viscosum</em> tested was from a wild population located in Salem, New Hampshire.<br /><br /><em>Rhododendron viscosum</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron viscosum</em>,<br />Diploid <em>Rhododendron viscosum forma rhodanthum</em>,<br />Diploid <em>Rhododendron viscosum var. serrulatum</em><br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-85007717468896694142010-12-25T01:00:00.000-08:002012-01-29T09:46:52.674-08:00Rhododendron prinophyllum is a Diploid<em>Rhododendron prinophyllum</em> has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences,<br />Faculty of Science and Technology,<br />University of Coimbra, Portugal.<br /><br />One <em>Rhododendron prinophyllum</em> tested was from a wild population located in Stoddard, New Hampshire.<br /><br /><em>Rhododendron prinophyllum</em> was also determined to be a diploid using flow cytometry by Dr. Thomas Ranney, J.R. Jones, and Nathan Lynch.<br /><br />Summary of Ploidy Levels<br /><br />Diploid <em>Rhododendron prinophyllum</em><br /><br />Source: Connecticut College Aboretum<br />Source: Stoddard Bog, Stoddard, NH<br />Source: Abbott, Saxton River, VT<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.comtag:blogger.com,1999:blog-26039855.post-84287484928994816082010-09-25T14:39:00.000-07:002012-01-29T09:46:53.696-08:00'Marie Hoffman' is a Diploid<img src= "http://www.rosebay.org/chapterweb/images/hb_prinophyllum_marie_hoffman_wr_67.jpg" alt="Rhododendron prinophyllum 'Marie Hoffman' in Hanson, MA" width="800" height="600" /><br /><strong>Rhododendron 'Marie Hoffman'</strong> Picture by Henk Borsje <br /><br />Rhododendron 'Marie Hoffman', which is often documented as a tetraploid form of <em>Rhododendron prinophyllum</em>, has been determined to be a diploid using flow cytometry by<br /><br />Dr. João Loureiro, Dr. Silvia Castro, José Cerca, and Mariana Castro<br />Plant Ecology and Evolution Group,<br />Centre for Functional Ecology,<br />Department of Life Sciences, <br />Faculty of Science and Technology, <br />University of Coimbra, Portugal.<br /><br />The nontypical <em>Rhododendron prinophyllum</em> characteristics of 'Marie Hoffman' are most likely due to hybridization with <em>Rhododendron molle</em>. 'Marie Hoffman', also, demonstrates the mule like fertility characteristics associated with most hybrids containing the combination of <em>Rhododendron prinophyllum</em> and <em>Rhododendron molle</em><br /><br />Summary of Ploidy Levels<br /><br />Diploid 'Marie Hoffman',<br />Diploid <em>Rhododendron molle</em>,<br />Diploid <em>Rhododendron prinophyllum</em> <br /><br />Source: John and Sally Perkins<br /><br />John and Sally PerkinsUSAhttp://www.blogger.com/profile/06082901465325697442noreply@blogger.com