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Note: Sweet flag, called Shōbu in Japanese, is a plant belonging to the family Acoraceae, genus ''Acorus'', known for its fragrant roots, rather than its flowers.References:
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Japanese iris
Iris ensata
The term "Japanese iris" encompasses three varieties of Irises cultivated in gardens or growing wild in Japan: ''hanashōbu'', ''kakitsubata'' and ''ayame''. The species ''I. japonica'' is dealt with under that heading.
The bluish purple color of the flowers of the Japanese garden iris is an example of the copigmentation phenomenon.
The bluish purple color of the flowers of the Japanese garden iris is an example of the copigmentation phenomenon.