Tenninsou (Celestial grass) - Tenninsou (English spelling) Comanthosphace japonica

Japanese: テンニンソウ(天人草) - テンニンソウ（英語表記）Comanthosphace japonica

A perennial plant of the Lamiaceae family. It is distributed throughout Japan from Hokkaido to Kyushu, and grows in mountainous areas. It has a thick rhizome underground, and the aboveground stem is thick, square-columnar, 50-100 cm tall, with the lower part woody. The leaves are opposite, oblong, 10-20 cm long, yellow-green, and dull. Around August to September, spike-like inflorescences appear at the ends of the branches, and pale yellow flowers grow densely. Two to three flowers are enclosed in bracts, the tips of which are pointed like tails. The corolla is tubular with a lip-shaped tip, and four stamens and one pistil protrude outside the flower.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

シソ科の多年草。北海道から九州にかけて日本全土に分布し，山地に生える。地下に太い根茎があり，地上茎は太く四角柱状で高さ 50～100cmとなって下部は木化する。葉は対生し長さ 10～20cmの長楕円形，黄緑色で光沢はない。8～9月頃，枝先に穂状の花序をつけ，淡黄色の花を密生する。花は2～3花ずつ包葉に包まれ，包葉の先端は尾状にとがる。花冠は筒状で先が唇形，おしべ4本とめしべ1本を花外に突き出す。

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