Rhododendron 'Beauty of Littleworth', which is a 1884 James Henry Mangles hybrid documented as R. griffithianum x R. campanulatum ssp. campanulatum, has been determined to be a triploid 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 Triploids from the 19th century
'Broughtonii' 1840,
'Cynthia' 1856,
'Beauty of Littleworth' 1884,
'Pink Pearl' 1892,
'Gomer Waterer' 1900
Source: Whitney Nursery
John and Sally Perkins
