Arabis glabra; tower mustard

Japanese: ハタザオ(旗竿) - ハタザオ（英語表記）Arabis glabra; tower mustard

A biennial plant of the Brassicaceae family. It is widely distributed from the temperate zone to the subtropical zone of the Northern Hemisphere. It grows in sunny areas of mountains and fields throughout Japan, as well as in sandy areas on the coast. The taproot is white and slender, and goes straight into the ground. Only one stem stands upright like a pole, and only the lower part is hairy, and it usually does not branch. The basal leaves are oblanceolate and spread out in a rosette shape, and together with the lower stem leaves, both sides have forked and star-shaped hairs. The upper stem leaves are lanceolate and glabrous, and the base is arrowhead-shaped, embracing the stem. In early summer, a long and slender raceme is formed at the apex of the stem, and many small yellowish-white cruciform flowers are produced. The fruit is a long and slender silique 4 to 5 cm long, and when ripe, the skin splits in two to release the seeds.

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

Japanese:

アブラナ科の越年草。北半球の温帯から暖帯にかけて，広く分布する。日本各地の山野の日当りのよいところや海岸の砂地に生える。主根は白色で細長く，地中にまっすぐに入る。茎は1本だけが竿のように直立し，下部だけに毛が生え，通常分枝しない。根出葉は倒披針形でロゼット状に広がり，下部の茎葉とともに両面とも叉状毛と星状毛をもつ。上部の茎葉は披針形で無毛，基部は鏃 (やじり) 形となり茎を抱く。初夏，茎頂に細長い総状花序をなして，帯黄白色で小型の十字花を多数つける。果実は長さ4～5cmもある細長い長角果で，熟すると果皮が2つに裂け，種子を放出する。

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