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Asparagus or garden asparagus, scientific name ''Asparagus officinalis'', is a spring vegetable, a flowering perennial plant species in the genus ''Asparagus''. It was once classified in the lily family, like the related ''Allium'' species, onions and garlic, but the Liliaceae have been split and the onion-like plants are now in the family Amaryllidaceae and asparagus in the Asparagaceae. ''Asparagus officinalis'' is native to most of Europe, northern Africa and western Asia, and is widely cultivated as a vegetable crop. == Biology == Asparagus is a herbaceous, perennial plant growing to tall, with stout stems with much-branched, feathery foliage. The "leaves" are in fact needle-like cladodes (modified stems) in the axils of scale leaves; they are long and broad, and clustered four to 15 together, in a rose-like shape. The root system is adventitious and the root type is fasciculated. The flowers are bell-shaped, greenish-white to yellowish, long, with six tepals partially fused together at the base; they are produced singly or in clusters of two or three in the junctions of the branchlets. It is usually dioecious, with male and female flowers on separate plants, but sometimes hermaphrodite flowers are found. The fruit is a small red berry 6–10 mm diameter, which is poisonous to humans.〔(【引用サイトリンク】title=Growing Asparagus )〕 Plants native to the western coasts of Europe (from northern Spain north to Ireland, Great Britain, and northwest Germany) are treated as ''Asparagus officinalis'' subsp. ''prostratus'' (Dumort.) Corb., distinguished by its low-growing, often prostrate stems growing to only high, and shorter cladodes long.〔〔 It is treated as a distinct species, ''Asparagus prostratus'' Dumort, by some authors. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Asparagus」の詳細全文を読む スポンサード リンク
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