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''Stevia rebaudiana'' is a plant species in the genus ''Stevia'' of the sunflower family (Asteraceae), commonly known as sweetleaf, sweet leaf, sugarleaf. Stevia is a tender perennial native to parts of Brazil and Paraguay that favors humid, wet environments, although the root does not tolerate standing water. Stevia is widely grown for its sweet leaves, which are the source of sweetener products known generically as stevia and sold under various trade names. The active compounds are various steviol glycosides (mainly stevioside and rebaudioside), which have 250–300 times the sweetness of sugar. The leaves can be eaten fresh, or put in teas and foods. ==History and use== The plant has been used for more than 1500 years by the Guaraní people of Brazil and Paraguay, who called it ''ka'a he'ê'' ("sweet herb"), to sweeten the local yerba mate tea, as medicine, and as a "sweet treat". In 1899, botanist Moisés Santiago Bertoni first described the plant as growing in eastern Paraguay, and observed its sweet taste. In 1931, chemists M. Bridel and R. Lavielle isolated the glycosides stevioside and rebaudioside that give the leaves their sweet taste. The exact structure of the aglycone and the glycoside was published in 1955. 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「Stevia rebaudiana」の詳細全文を読む スポンサード リンク
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