悪茄子(ワルナスビ) horsenettle

茎や葉に沢山の棘があるので、うっかり草の中に踏み込むと痛い思いをします。毒草で繁殖力が強いので嫌われ者です。

There are many thorns on the stems and leaves, so if you accidentally step into the grass, you will feel pain. It is an unpopular plant because it is a poisonous plant and has a strong fertility.