"Jakou-so" (Chelonopsis moschata) belongs to the Lamiaceae (the Mint family). It is an endemic species of Japan, distributed from the southwestern part of Hokkaido to Honshu, Shikoku and Kyushu. This herb grows in the valleys and slopes of mountainous areas, and the height is 60-100 cm. The leaves are oblong and coarsely serrated, and arranged in opposite. The purplish red flowers bloom on the short peduncles from the axils, in August and September. The upper lip is short and the lower lip is three lobed. The flowers are highly variable in color.