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Erica tetralix
''Erica tetralix'' (cross-leaved heath) is a species of flowering plant in the family Ericaceae, native to western Europe, from southern Portugal to central Norway, as well as a number of boggy regions further from the coast in Central Europe such as Austria and Switzerland. In bogs, wet heaths and damp coniferous woodland, ''E. tetralix'' can become a dominant part of the flora. It has also been introduced to parts of North America.〔http://linnaeus.nrm.se/flora/di/erica/erica/erictetv.jpg〕
It is a perennial subshrub with small pink bell-shaped drooping flowers borne in compact clusters at the ends of its shoots, and leaves in whorls of four (whence the name). The flowers appear in summer and autumn. The distinction between ''E. tetralix'' and the related species ''Erica cinerea'' is that the linear leaves are usually glandular and in whorls of four, while in ''E. cinerea'' they are glabrous and borne in whorls of three. By comparison, the leaves of ''Calluna vulgaris'' are much smaller and scale-like and borne in opposite and decussate pairs.〔C. Stace (2010) New Flora of the British Isles, 3rd edition. Cambridge University Press.〕 The sticky, adhesive glands on leaves, sepals and other parts of the plant prompted Charles Darwin to suggested that this species might be a protocarnivorous plant, but little if any research has been done on this.〔Darwin, Charles. (1875). ''(Insectivorous Plants )''. London: J. Murray.〕
In cultivation, like other heathers, ''E. tetralix'' requires a well-drained soil in full sun with acidic soil, as it is a calcifuge. Numerous cultivars have been developed for garden use, of which ''E. tetralix'' f. ''alba'' 'Alba Mollis'〔(【引用サイトリンク】url=http://apps.rhs.org.uk/plantselector/plant?plantid=719 )〕 (a white-flowered variety) have gained the Royal Horticultural Society's Award of Garden Merit.
== References ==
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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