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|synonyms_ref = }} ''Dioscorea alata'', known as purple yam and many other names, is a species of yam, a tuberous root vegetable. The tubers are usually bright lavender in color, hence the common name, but they may sometimes be white. It is sometimes confused with taro and the Okinawa sweet potato (''Ipomoea batatas'' cv. Ayamurasaki), although ''D. alata'' is also grown in Okinawa where it is known as . With its origins in the Asian tropics, ''D. alata'' has been known to humans since ancient times.〔 〕 ==Common names== Because it has become naturalized throughout tropical South America, Africa, Australia, the US southeast, ''D. alata'' has many different common names from these regions. In English alone, aside from purple yam, other common names include greater yam, Guyana arrowroot, ten-months yam, water yam, white yam, winged yam, or simply yam.〔 In other cultures and languages it is known variously as ''ratalu'' or ''violet yam'' in India, ''rasa valli kilangu'' (இராசவள்ளிக்கிழங்கு) in Tamil, ''kondfal'' (कोंदफळ) in Marathi, ''kachil'' (കാച്ചില്) in Malayalam, and ''khoai mỡ'' in Vietnam. For the Igbo people of southern Nigeria, it is called ''ji'' or ''ji abana''; while for the Yoruba people of the southwestern Nigeria, it is called ''isu ewura''. ;Malayo-Polynesian languages * *''ʔube'' can be reconstructed as the Proto-Malayo-Polynesian word for ''D. alata'',〔[]〕 and words descended from it are found throughout the geographic range of this widespread language family, though in some daughter languages they are generalized or transferred to other root crops. Examples include Tagalog ''ube'' or ''ubi'', Indonesian and Malay ''ubi'' * *, Malagasy ''ovy'' * *, Fijian ''uvi'', Tongan ''ufi'', Samoan ''ufi'' * *, as well as Māori and Hawaiian ''uhi''. ''D. alata'' was one of the canoe plants that the Polynesians brought with them when they settled new islands. * * 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「Dioscorea alata」の詳細全文を読む スポンサード リンク
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