The Common lespedeza (Kummerowia striata) belongs to Fabaceae (the Pea family). It is a perennial herb that is native to all over Japan, Korean Peninsula, China and Taiwan. This herb grows in fields and roadsides, and can reach 15-40 cm in height. The leaves are trifoliate with oblong leaflets. The leaflets are lined with side veins diagonally, and when you pull the tip, it looks like an arrowhead. "Yahazu" is a pattern that resembles the wings of an arrow. The pale magenta flowers come on the axiles from August to October. It is a foodplant for Short-tailed blue (Everes argiades) and Eastern pale clouded yellow (Colias erate poliographus).