Describe Indigo colour, plant in 700 words.
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Indigo, (genus Indigofera), large genus of more than 750 species of shrubs, trees, and herbs in the pea family (Fabaceae). Some species, particularly true indigo (Indigofera tinctoria) and Natal indigo (I. arrecta), were once an important source of indigo dye. The cultivation of indigo plants and the extraction of the dyestuff were an important industry in India up to the beginning of the 20th century. Synthetic indigo, developed about that time, gradually replaced natural indigo as a dyestuff. The plants are native to tropical and subtropical regions worldwide.Indigofera tinctoria, also called true indigo, is a species of plant from the bean family that was one of the original sources of indigo dye. It has been naturalized to tropical and temperate Asia, as well as parts of Africa, but its native habitat is unknown since it has been in cultivation worldwide for many centuries. Today most dye is synthetic, but natural dye from I. tinctoria is still available, marketed as natural coloring where it is known as tarum in Indonesia and nila in Malaysia. In Iran and areas of the former Soviet Union it is known as basma. The plant is also widely grown as a soil-improving groundcover.
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