ブタクサ 豚草
any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
主に北米産の種々のブタクサ属の雑草の総称で、花粉は高程度にアレルギーを誘発し多くの花粉症や喘息の原因となる