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The Canna Agriculture Group contains all of the varieties of Canna used in agriculture. Canna achira and Canna edulis (Latin: eatable) are generic terms used in South America to describe the cannas that have been selectively bred for agricultural purposes, normally derived from C. ''discolor''.〔Tanaka, N. 2001. Taxonomic revision of the family Cannaceae in the New World and Asia〕 It is grown especially for its edible rootstock from which starch is obtained, but the leaves and young seed are also edible, and achira was once a staple foodcrop in Peru and Ecuador.〔Chaté, E. (1867) Le Canna, son histoire, sa culture. Libraire Centrale d'Agriculture et de Jardinage〕 == Farming varieties == There are some named agricultural varieties, and published comparative studies have involved: Many more traditional varieties exist worldwide, they have all involved human selection and so are classified as agricultural cultivars. Folk lore states that ''Canna edulis'' Ker-Gawl. is the variety grown for food in South America, but there is no scientific evidence to substantiate the name as a separate species. It is probable that this is simply a synonym of C. ''discolor'', which is grown for agricultural purposes throughout South America and Asia.〔 In the Andes, the rhizome can be harvested within 6 months from planting out and the yields range from 13 - 85 tonnes per hectare, with 22 - 50 tonnes being average, though larger yields are obtained after 8 – 10 months. In Queensland, Australia they are able to obtain a yield of 5-10 tons of C. 'Queensland Arrowroot' tubers per acre.〔(Arrowroot, James M. Stephens, University of Florida )〕 Most cultivated forms do not produce fertile seed. There are also sterile triploid forms, these contain a significantly higher proportion of starch, though their cropping potential is not known.〔Khoshoo, T.N. & Guha, I. - Origin and Evolution of Cultivated Cannas. Vikas Publishing House〕〔(Polyploidy in Cannas )〕〔(More polyploidy in Cannas )〕 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「Canna Agriculture Group」の詳細全文を読む スポンサード リンク
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