Rabdosia inflexa (Thunb.) Hara

Japanese: ヤマハッカ（英語表記）Rabdosia inflexa (Thunb.) Hara

A perennial herb of the Lamiaceae family (illustration) that grows in sunny mountain grasslands and roadsides. The underground stem is clumpy and woody. The stem is quadrangular and 50-100 cm tall. The leaves are opposite, ovate, 3-6 cm long, with sawtooth edges and a wedge-shaped, winged petiole at the base. They flower from September to October in sparse spikes at the top of the stem and in the upper leaf axils, producing small, bluish-purple, lip-shaped flowers. The calyx is bell-shaped with five lobes at the tip. The corolla is two-lipped and 7-9 mm long, with the upper lip standing upright and four lobes, and the lower lip is boat-shaped and protrudes forward.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

日当りのよい山の草地や道端に生えるシソ科の多年草（イラスト）。地下茎は塊状で木化する。茎は四角形で高さ50～100cm。葉は対生し，卵形で長さ3～6cm，縁には鋸歯があり，基部にはくさび形の翼をもった葉柄がある。花は9～10月，茎の頂と上部の葉腋（ようえき）にまばらな花穂を作って，青紫色の小型の唇形花をつける。萼は鐘形で先は5裂。花冠は2唇形で長さ7～9mm，上唇は4裂して立ち，下唇は舟形で前につき出る。

出典　株式会社平凡社世界大百科事典第２版について　情報

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