Rhododendron 'Norman Gill', which is a Gill hybrid documented as 'Beauty of Tremough' x R. griffithianum, 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 'Norman Gill' has as a descendant 'Anna'.
Summary of Ploidy Levels
Diploid 'Anna',
Diploid 'Norman Gill'
Source: Van Veen Nursery
John and Sally Perkins
