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Alcea rosea
''Alcea rosea'' (common hollyhock; syn. ''Althaea chinensis'' Wall., ''Althaea ficifolia'' Cav., ''Althaea rosea'' Cav.) is an ornamental plant in the Malvaceae family.
It was imported into Europe from southwestern China during, or possibly before, the 15th century.〔(【引用サイトリンク】url=http://flora.huh.harvard.edu/china//PDF/PDF12/Alcea.pdf )〕 William Turner, a herbalist of the time, gave it the name "holyoke" from which the English name derives.
==Cultivation==
''Alcea rosea'' is variously described as a biennial (having a two-year life cycle), as an annual, or as a short-lived perennial.〔〔〔(【引用サイトリンク】title=Plant of the Month - Hollyhocks )〕 It frequently self-sows, which may create a perception that the plants are perennial.〔(【引用サイトリンク】publisher=Cornell University )〕 The plant may flower during its first year when sown early.〔(【引用サイトリンク】publisher=University of Illinois )〕 It will grow in a wide range of soils, and can easily reach a height of about .
The flowers are a range of colours from white to dark red, including pink, yellow and orange. Different colours prefer different soils. The darker red variety seems to favour sandy soils, while the lighter colour seems to favour clay soils. The plants are easily grown from seed, and readily self-seed. However, tender plants, whether young from seed or from old stock, may be wiped out by slugs and snails. The foliage is subject to attack from rust (''Puccinia malvacearum''), which may be treated with fungicides. Commercial growers have reported that some closely related species (''Alcea rugosa'' and ''Alcea ficifolia'') are resistant to this fungus.
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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