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The "Haguro-so" (Peristrophe japonica) belongs to Acanthaceae (theRuellia family). It is a perennial herb that is distributed westward from Kanto district of Honshu to Shikoku, Kyushu of Japan, as well as Taiwan, the Korean Peninsula and central China. This herb grows in mountainous tree-shaded areas, and can reach 20-50 cm in height. The leaves are ovate-oblong to lanceolate and arranged in opposite. The peduncles are borne on the terminal branches and axils, and the magenta flowers with leafy bracts bloom in September and October. The corolla are two labiate with two stamens. In Taiwanese Chinese, it is called "九頭獅子草", and "九頭獅子草" (jiu tou shi zi cao) in Chinese.
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