美国东北部引入的欧洲山柳菊；不易根除的杂草。
European hawkweed introduced into northeastern United States ; locally troublesome weeds .
山柳菊任何常覆有绒毛的有黄色或橙色类似蒲公英的头状花序的植物属山柳菊。
Any of numerous often hairy plants of the genus Hieracium , having yellow or orange dandelionlike flower heads .
山柳菊山柳菊山柳菊