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The Jerusalem artichoke (''Helianthus tuberosus''), also called sunroot, sunchoke, earth apple or ''topinambour'', is a species of sunflower native to eastern North America, and found from eastern Canada and Maine west to North Dakota, and south to northern Florida and Texas.〔Germplasm Resources Information Network: (''Helianthus tuberosus'' )〕 It is also cultivated widely across the temperate zone for its tuber, which is used as a root vegetable.〔Purdue University Center for New Crops & Plants Products: (''Helianthus tuberosus'' )〕 ==Description== ''Helianthus tuberosus'' is a herbaceous perennial plant growing to tall with opposite leaves on the upper part of the stem but alternate below.〔Dickinson, T.; Metsger, D.; Bull, J.; & Dickinson, R. (2004) ROM Field Guide to Wildflowers of Ontario. Toronto:Royal Ontario Museum, p. 170.〕 The leaves have a rough, hairy texture. Larger leaves on the lower stem are broad ovoid-acute and can be up to long. Leaves higher on the stem are smaller and narrower.〔 The flowers are yellow and produced in capitate flowerheads, which are in diameter, with 10–20 ray florets and 60 or more small disc florets.〔 The tubers are elongated and uneven, typically long and thick, and vaguely resembling ginger root in appearance, with a crisp texture when raw. They vary in colour from pale brown to white, red, or purple.〔〔 〕 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「Jerusalem artichoke」の詳細全文を読む スポンサード リンク
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