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''Isatis tinctoria'', with woad () or glastum as the common name, is a flowering plant in the family Brassicaceae. It is commonly called dyer's woad. It is occasionally known as Asp of Jerusalem. Woad is also the name of a blue dye produced from the leaves〔 (【引用サイトリンク】 title = Woad – Definition and More ) 〕 of the plant. Woad is native to the steppe and desert zones of the Caucasus, Central Asia to eastern Siberia and Western Asia (per Hegi〔Hegi,G. ''Illustrierte Flora von Mitteleuropa. Spermatophyta, Band IV Teil 1. Angiospermae, Dicotyledones 2'', pp. 126–131 (1986).〕) but is now found in southeastern and Central Europe as well. Long important as a source of blue dye, it has been cultivated throughout Europe, especially in Western and southern Europe, since ancient times. In medieval times there were important woad-growing regions in England, Germany and France. Towns such as Toulouse became prosperous from the woad trade. Woad was eventually replaced by the stronger indigo and, in the early 20th century, both woad and indigo were replaced by synthetic indigos. Used in traditional Chinese medicine for centuries, woad is now being studied for use in the treatment of cancer. There has also been some revival of the use of woad for craft purposes. ==History of woad cultivation== 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「isatis tinctoria」の詳細全文を読む スポンサード リンク
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