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Rhododendron indicum is an azalea Rhododendron species native to Japan (S & W Honshu, Shikoku, Kyushu, ... Azalea indica L. Steve Cafferty and Charles E. Jarvis ...
Azalea leafy gall can be particularly destructive to azalea leaves during the early spring. Hand picking infected leaves is the recommended method of control. [4] They can also be subject to Phytophthora root rot in moist, hot conditions. [5] Azaleas share the economically important disease Phytophthora cinnamomi with more than 3000 other plants.
These plants can spread by rhizomes if the soil is loose. The flowers can be white or a light pink color, and are fragrant. The flower tubes are the same colors, and are glandular. The pinkish red glands form a line onto each petal tip. Leaf color ranges from gray-green to blue-green. Dwarf azaleas are commonly less than two feet tall.
Tsutsusi comes from the Japanese word for Azalea, Tsutsuji ( つつじ or ツツジ). When Don (1834) described the subdivisions of Rhododendron he named one of his eight sections, Tsutsutsi (sic), which he explained was the Chinese name of the first species described (R. indicum, originally Azalea indica L.). [8]
Two subgenera are generally known to gardeners as "Azaleas", and include many fewer true species: Pentanthera, which comprises the deciduous azaleas, and Tsutsusi, which includes evergreen azaleas. [3] Modern cladistic analysis, based on nuclear genetics, proposes changes in the classification of species within subgenera.
Rhododendron (/ ˌ r oʊ d ə ˈ d ɛ n d r ən /; pl.: rhododendra) is a very large genus of about 1,024 species of woody plants and in the heath family (Ericaceae). They can be either evergreen or deciduous.
Azalea indica var. simsii (Planch.) L.H. Bailey; Rhododendron breynii Planch. Rhododendron danielsianum Planch. Rhododendron decumbens D. Don ex G. Don; Rhododendron hannoense Nakai; Rhododendron indicum (L.) Sweet (Satsuki azalea) Rhododendron lateritium Planch. Rhododendron macranthum (Bunge) G. Don
Rhododendron occidentale, the western azalea [1] or California azalea, is one of two deciduous Rhododendron species native to western North America (the other is Rhododendron albiflorum). The western azalea is known to occur as far north as Lincoln and Douglas Counties in Oregon and as far south as the mountains of San Diego county.
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