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sweet potato : ウィキペディア英語版
sweet potato

The sweet potato (''Ipomoea batatas'') is a dicotyledonous plant that belongs to the family Convolvulaceae.
Its large, starchy, sweet-tasting, tuberous roots are a root vegetable. The young leaves and shoots are sometimes eaten as greens. ''Ipomoea batatas'' is native to the tropical regions in the Americas.〔(【引用サイトリンク】title=Ipomoea batatas )〕〔(【引用サイトリンク】title=Sweet Potato (Ipomoea batatas) Classification )〕 Of the approximately 50 genera and more than 1,000 species of Convolvulaceae, ''I. batatas'' is the only crop plant of major importance—some others are used locally, but many are poisonous. The sweet potato is only distantly related to the potato (''Solanum tuberosum'') and does not belong to the nightshade family.
The genus ''Ipomoea'' that contains the sweet potato also includes several garden flowers called morning glories, though that term is not usually extended to ''Ipomoea batatas''. Some cultivars of ''Ipomoea batatas'' are grown as ornamental plants; the name ''tuberous morning glory'' may be used in a horticultural context.
The plant is a herbaceous perennial vine, bearing alternate heart-shaped or palmately lobed leaves and medium-sized sympetalous flowers. The edible tuberous root is long and tapered, with a smooth skin whose color ranges between yellow, orange, red, brown, purple, and beige. Its flesh ranges from beige through white, red, pink, violet, yellow, orange, and purple. Sweet potato varieties with white or pale yellow flesh are less sweet and moist than those with red, pink or orange flesh.〔
==Naming==

In certain parts of the world, sweet potatoes are locally known by other names. Although the soft, orange sweet potato is often called a ''"yam"'' in parts of North America, the sweet potato is botanically very distinct from a genuine yam (''Dioscorea''), which is native to Africa and Asia and belongs to the monocot family Dioscoreaceae. To add to the confusion, a different crop plant, the oca, ''Oxalis tuberosa'' (a species of wood sorrel), is called a "yam" in many parts of Polynesia, including New Zealand. To prevent confusion, the United States Department of Agriculture requires sweet potatoes to be labeled as "sweet potatoes" and not as "yams".

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「sweet potato」の詳細全文を読む



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