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The Blue beard (Caryopteris incana) belongs to Asteraceae (the Aster family). It is a perennial herb that is distributed from southern Kyushu to Tsushima Island in Japan, as well as Taiwan, the southern Korean Peninsula and southern China. This herb grows in the seaside grasslands and mountain gravellands, and up to a height of 30-150 cm. The bluish-purple flowers bloom in the inflorescences which close around the stem from August to October. There are also white and pink flower-colors. In Taiwanese Chinese, it is called "灰葉蕕", and "蘭香草" (lan xiang cao) in Chinese.
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