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Awards AM 1898 (W. Nicholson, Basing Park, Alton); flowers clear orange-scarlet. AM 1965 (Knaphill Nursery, Woking) to a clone 'Splendens'; flowers Rose Bengal.
Taxonomic note R. obtusum and the many of the forms and varieties described under that name are cultivated selections of R. kiusianum, or hybrids between it and R. kaempferi (see note under the former species). Royal Horticultural Society (1997)
see under R. kaempferi