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Ryukyu azalea [Rhododendron mucronatum G.Don.]

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Explanations

Origin
This group relates to R. macrosepalum and R. ripense .
Characteristics
Shrub, 1-2m. Inflorescense 2-3flowered. Corolla diameter 5-8cm. Calyx has glandular hairs. It divides into two groups, 'Ooryukyu' line similar to R. macrosepalum and 'Shiroryukyu' line similar to R. ripense. However some cultivars show intermediate character between two species.
'Ooryukyu' line is thick, loose branched and large leaf. These characters is resemble to R. macrosepalum . While 'Ooryukyu' line has 7-10stamens , R. macrosepalum has 5-6stamens . 'Shiroryukyu' line is much-branched and young shoots densely clothed with strigose. Leaves lanceolate.
Uses
garden
References
Gardenlife 1976,"Tsutsusi sonosyurui to saibai" SeibundoShinkousya (in Japanese)
Gardenlife 1978,"Yasei no Tsutsusi" SeibundoShinkousya (in Japanese)
Gardenlife 1979,"Nippon no Engei Tsutsusi" SeibundoShinkousya (in Japanese)
Gardenlife 1985,tsuukan205 pp.103-106 (in Japanese)
Matsuo,T 1989,"Collected Data of Plant Genetic Resources" Koudansya scientific (in Japanese)