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・ Rhododendron macrophyllum
・ Rhododendron maddenii
・ Rhododendron maximum
・ Rhododendron menziesii
・ Rhododendron micranthum
・ Rhododendron minus
・ Rhododendron minus var. chapmanii
・ Rhododendron molle
・ Rhododendron moulmainense
・ Rhododendron mucronatum
・ Rhododendron mucronulatum
・ Rhododendron myrtifolium
・ Rhododendron nakaharae
・ Rhododendron neoglandulosum
・ Rhododendron niveum
Rhododendron occidentale
・ Rhododendron oreotrephes
・ Rhododendron ovatum
・ Rhododendron periclymenoides
・ Rhododendron phaeochrysum
・ Rhododendron polycladum
・ Rhododendron ponticum
・ Rhododendron principis
・ Rhododendron prinophyllum
・ Rhododendron pruniflorum
・ Rhododendron prunifolium
・ Rhododendron pulchrum
・ Rhododendron rarilepidotum
・ Rhododendron rex
・ Rhododendron rigidum


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Rhododendron occidentale : ウィキペディア英語版
Rhododendron occidentale

''Rhododendron occidentale'', the western azalea 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. Typically found in the coastal ranges of western North America, it also grows in the Cascade and Sierra Nevada mountain ranges, but is not known east of them.
==Description==
''Rhododendron occidentale'' is a shrub growing to 5 m tall. The leaves are deciduous, 3–9 cm long and 1–3 cm broad. The flowers are 3.5–5 cm diameter, with five lobes on the corolla; color varies from white to pink, often with a yellow blotch.
There is considerable diversity in the form and appearance of this species, with genetic diversity seeming to reach its highest level along the coast in the vicinity of the border between Oregon and California. It is tolerant of serpentine soils to the point that serpentine soils (along with surface water) can be used as a sign of its presence in southern Oregon. For this reason, it is a part of the unique plant community found in the serpentine barrens of the Siskiyou Mountains, along with ''Darlingtonia californica'' and ''Cypripedium californicum''. It is usually found in wetlands although, like other rhododendrons, it does not grow with its roots submerged in water. It prefers both more moisture and more sunlight than ''Rhododendron macrophyllum'', an evergreen rhododendron with a similar range.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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