Kummerowia striata (English name: Kummerowia striata)

Japanese: ヤハズソウ(矢筈草) - ヤハズソウ（英語表記）Kummerowia striata

An annual plant of the legume family. It is distributed throughout Japan and East Asia, and has become naturalized in North America. It commonly grows as a weed in fields and roadsides. The stem is 10-50 cm tall, branches well from the base, and has downward-facing hairs. The leaves consist of three leaflets, each of which is 1-1.5 cm long, oblong, and blunt, and the stipules are pale brown, ovate, and membranous. From August to October, one or two small, pale purple, butterfly-shaped flowers grow in the axils. The calyx has short hairs, is bell-shaped, and has five lobes. The pods are small and contain one seed inside. They do not split even when ripe, but have persistent calyxes. When the leaflets are pulled, they break at the veins, forming an arrow-shaped shape, hence the name.

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

Japanese:

マメ科の一年草。日本全土，東アジアに分布し，北アメリカに帰化する。原野や路傍に雑草として普通に生える。茎は高さ 10～50cm，根もとからよく分枝し，下向きの毛がある。葉は3小葉から成り，小葉は長さ1～1.5cmの長楕円形で鈍頭，托葉は淡褐色，卵形で薄膜質である。8～10月に淡紅紫色の小さな蝶形花を1～2個腋生し，萼は短い伏毛があり，鐘形で5裂する。莢は小型で中に1個の種子を生じ，熟しても割れず，宿存萼をつける。小葉を引っぱると葉脈のところで切れ，矢筈形になるのでこの名がある。

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