Rhododendron 'Ramapo', which is a Guy Nearing hybrid documented as Rhododendron minus Carolinianum Group x Rhododendron fastigiatum, has been determined to be a triploid using flow cytometry by
Dr. João Loureiro, Dr. Silvia Castro, 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.
'Ramapo' is documented to be the seed parent of the triploid 'Ramolet'.
Summary of Ploidy Levels
Diploid Rhododendron minus,
Triploid 'April Rhapsody',
Triploid 'Purple Gem',
Source: John and Sally Perkins
John and Sally Perkins