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The "Hime-kisewata" (Matsumurella tuberifera) belongs to Labiaceae (the Mint family). It is a perennial herb that is distributed from southern Kyushu to Tanegashima, Takarajima in the Tokara Islands, Amami-Oshima in the Amami Islands, Kumejima in the Okinawa Islands, as well as Taiwan and southern China. It grows in grassy areas along forest edges and reaches a height of 10 to 30 cm. It extends slender rhizomes underground, producing spherical tubers at their tips. The stems are square in cross-section and covered with downy hairs. The leaves are broadly ovate, with coarse serrations along the margins, and are arranged in opposite pairs. From January to around May, whitish flowers with faint reddish spots bloom in whorls from the upper leaf axils; these flowers are of the lamiate type. The fruit is a small, triangular achene. It is classified as Vulnerable (VU) in the Ministry of the Environment's Red List. In Taiwanese Chinese, it is called "塊莖小野芝麻", and "塊莖小野芝麻" (kuai gen xiao ye zhi ma) in Chinese.
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