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Acer sieboldianum
''Acer sieboldianum'' (Siebold's Maple; (日本語:コハウチワカエデ ''kohauchiwakaede'')) is a species of maple native to Japan and common in the forests of Hokkaidō, Honshū, Shikoku and Kyūshū Islands; in the south of the range it is restricted to mountain forests.〔Kobe city: (''Acer sieboldianum'' ) (in Japanese; (google translation ))〕 It is named after Philipp Franz von Siebold.
==Description==
It is a slow-growing, small to medium-sized deciduous tree growing to tall, with smooth grey-brown bark. The young shoots are green to red, thinly covered with white hairs in their first year. The leaves are mid to dark green, long and broad with a petiole, and palmately lobed with nine to eleven (occasionally just seven) lobes. The young leaves in spring are downy with white hairs, with the petiole and veins on the underside of the leaf remaining hairy all summer, a feature useful in distinguishing it from the related ''Acer palmatum''. In autumn, the leaves turn bright orange to red. The flowers are pale yellow, produced in corymbs of 10–15 together; it is andromonoecious, with inflorescences containing flowers with either both sexes, or just male. The fruit is a paired samara, the pair spreading horizontally, each seed with a wing. Flowering is in late spring, with fruit maturation in early autumn.〔〔Okayama science university: (''Acer sieboldianum'' ) (in Japanese; (google translation ))〕〔Kanagawa Prefecture trees and shrubs: (''Acer sieboldianum'' ) (in Japanese; (google translation )). (Archived ) 2009-10-24.〕〔van Gelderen, C.J. & van Gelderen, D.M. (1999). ''Maples for Gardens: A Color Encyclopedia''.〕
The smooth bark and yellow flowers help distinguish it from the closely related ''Acer japonicum'' (Japanese, ''hauchiwakaede''), which has rough, scaly bark, and red flowers, while the hairy stems and yellow flowers distinguish it from ''Acer shirasawanum'' (Japanese, ''ooitayameigetsu''; with hairless stems and red flowers).〔〔Japanese mountain plants: (kohauchiwakaede ) (in Japanese; (google translation ))〕
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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