|Ilex crenata subsp. var.||Japanese Holly, Box-leaved Holly, inutsuge|
Japanese Holly is grown as an ornamental plant for its dense evergreen foliage. It is superficially similar in appearance to box (Buxus), and is often used in similar situations; it can readily be distinguished from box by its alternate, not opposite, leaf arrangement.
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.
|Standard Cyclopedia of Horticulture|
Ilex crenata, Thunb. (I. fortunei, Hort.). Much- branched shrub, rarely small tree to 20 ft.: lvs. oval, obovate or oblong-lanceolate, crenately serrate, glabrous, ½ - 1 ½ in. long: fls. 4-merous: fr. ¼ in. across, solitary, short-stalked. May, June; fr. in Oct. Japan. Gng. 6:165. F.E. 30:1161. G.M. 46:208. Gn. 64, E413. Gn.M. 4:237. Ilex crenata var. microphylla, Maxim, vs. 1/3 – ½ in. long, elliptic or elliptic-oblong. This variety is somewhat hardier than the type. Ilex crenata var. longifolia, Hort. Lvs. elliptic-oblong to lanceolate. Ilex crenata var. luteo-variegata, Regel (Ilex crenata var.aureo-variegata, Hort.). Lvs. spotted yellow, obovate. M.D.G. 1913:53.
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Pests and diseases
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').
- ↑ Germplasm Resources Information Network: Ilex crenata
- ↑ Osaka hundred trees: Ilex crenata (in Japanese; google translation)
- ↑ Okayama Science University: Ilex crenata (in Japanese; google translation)
- ↑ 4.0 4.1 Huxley, A., ed. (1992). New RHS Dictionary of Gardening. Macmillan ISBN 0-333-47494-5.
- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963