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Kirishima azalea [Rhododendron obtusum (Lindl.) Planch.]

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Explanations

Origin
This group divides into 'Edo kirishima' and 'Kurume azalea'. 'Edo kirishima' is reportedly hybrid of R. kiusianum× R. kaempferi native to Pref. Kagoshima.
'Kurume azalea' relates to 'Edo kirishima' , R. sataense and R. kiusianum. Recently some cultivars are observed a few characters which are typical of R. macrosepalum and R. ripense.
Characteristics
Shrub, 1-2m. Inflorescense 1-4flowered. Corolla diameter 2-5cm. Flower cluster 1-4. Flowering time is from the middle ten days of April to the middle ten days of May at Kurume. In full flowering, canopy is fully covered with flowers. Leaves oblanceolate to broad ovate, 1-5×0.5-3cm.
Variation among cultivars of 'Kurume azalea' is larger than that of 'Edo kirishima'.
Uses
garden, pot, bonsai.
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)