… Dioscorea japonica is a general term for plants in the Dioscoreaceae family that are used for food. With the exception of the exceptional species Dioscorea japonica and Nagaimo, which are used in Japan, the natural distribution and cultivation areas of the dozens of species that are used are almost exclusively limited to the tropics and subtropics. Of these, there are only a few important species that are cultivated, such as water yam and spiny yam cultivated from Southeast Asia to Polynesia, Nagaimo in the warm temperate zone of East Asia, and Guinea yam and water yam cultivated in the yam zone of Africa. Of these, water yam is the most important, forming large tubers that sometimes exceed 30 kg, and is cultivated in the warm regions of Japan from Shikoku to Kyushu. … *Some of the terminology that mentions "Guineayam" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… ヤマノイモ(yam)類は,ヤマノイモ科植物で食用に利用している植物の総称であるが,日本で利用されるヤマノイモとナガイモという例外的な種をのぞいては,数十種に及ぶ利用種のほとんどの自然分布域や栽培圏は,熱帯から亜熱帯にほぼかぎられている。それらのうち,栽培される重要な種は数種で,東南アジアからポリネシアにかけてはダイジョやハリイモが,東アジア暖温帯域でのナガイモ,アフリカのヤム地帯ではギネアヤムとダイジョが栽培されている。これらのうちダイジョがもっとも重要で,ときには30kgをこえる大型のいもを形成し,日本でも四国や九州以南の温暖地で栽培されている。… ※「ギネアヤム」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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