Lotus corniculatus (English name) Lotus corniculatus var. japonicus; bird's-foot trefoil

Japanese: ミヤコグサ(都草) - ミヤコグサ（英語表記）Lotus corniculatus var. japonicus; bird's-foot trefoil

A perennial plant of the legume family. It is also called scutellaria or eboshigusa. It is found in various parts of Japan, as well as in eastern Asia and the Himalayas, and commonly grows in roadside grasslands and riverbanks. It has also naturalized in North America, where it has become a weed. The stems are green and grow in clumps, either erect or creeping on the ground. The leaves are small, stalked, trifoliate, and compound. The leaflets are obovate, entire, and about 1 cm long, with a pair of stipules at the base of the petiole that are the same size as the leaflets. From spring to summer, flower stalks emerge one after another from the leaf axils, and bear 1 to 3 small bright yellow butterfly-shaped flowers each. The fruit is a linear pod that twists when ripe.

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

Japanese:

マメ科の多年草。コガネバナ，エボシグサともいう。日本各地をはじめアジア東部からヒマラヤに分布し，路傍の草地，河原などに普通に生える。北アメリカにも帰化して雑草となっている。茎は緑色で叢生し，直立するか地上をはう。葉は小型で柄のある3出複葉で，小葉は倒卵形全縁で長さ 1cm前後，葉柄の基部に小葉と同大の1対の托葉がある。春から夏に，葉腋から次々と花柄を出し，鮮黄色の小さな蝶形花を1～3個ずつつける。果実は線形の莢で熟するとねじれる。

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