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Ilex crenata : ウィキペディア英語版 | Ilex crenata
''Ilex crenata'' (Japanese holly or box-leaved holly; Japanese: イヌツゲ ''inutsuge'') is a species of holly native to eastern China, Japan, Korea, Taiwan, and Sakhalin.〔Germplasm Resources Information Network: (''Ilex crenata'' )〕 It is an evergreen shrub or small tree growing to a height of 3–5 m (rarely 10 m) tall, with a trunk diameter up to 20 cm. The leaves are glossy dark green, small, 10–30 mm long and 10–17 mm broad, with a crenate margin, sometimes spiny. The flowers are dioecious, white, four-lobed. The fruit is a black drupe 5 mm diameter, containing four seeds. It grows well in acidic soil, between a pH of 3.7 and 6.0.〔Osaka hundred trees: (''Ilex crenata'' ) (in Japanese; (google translation ))〕〔Okayama Science University: (''Ilex crenata'' ) (in Japanese; (google translation ))〕〔Huxley, A., ed. (1992). ''New RHS Dictionary of Gardening''. Macmillan ISBN 0-333-47494-5.〕 ==Cultivation==
''I. crenata'' is grown as an ornamental plant for its dense evergreen foliage, and is a popular plant among Bonsai enthusiasts.〔(【引用サイトリンク】title= Japanese Holly Bonsai )〕 It is superficially similar in appearance to box, and is often used in similar situations; it can readily be distinguished from box by its alternate, not opposite, leaf arrangement. Numerous cultivars have been selected, including plants with the leaves variegated (e.g. 'Golden Gem', 'Shiro-Fukurin'), dark green (e.g. 'Green Lustre'), or greyish-green (e.g. 'Bad Zwischenahn'); with yellow fruit (e.g. 'Ivory Hall'); and with the habit erect (e.g. 'Chesapeake'), spreading (e.g. 'Green Island', 'Hetzii'), or dwarf (e.g. 'Mariesii', 'Stokes').〔 The variety 'Golden Gem'〔(【引用サイトリンク】url=http://apps.rhs.org.uk/plantselector/plant?plantid=1022 )〕 has gained the Royal Horticultural Society's Award of Garden Merit.
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