Horseweed加拿大蓬 · Conyza canadensis(L.) Cronquist

Also known as: 小蓬草、小白酒草、小飛蓬、姬昔蓬、小燕草、鐵道車蓬、蛇舌草、竹葉艾、魚膽草、苦蒿、祁州一隻蒿、破布艾、小山艾、臭艾、野茼蒿、加州殼菜蛤

It is not native to Taiwan, and here it is an invasive species.