a North American plant of the daisy family, which bears clusters of small white flowers and is used in herbal medicine 北美贯叶泽兰;兰草
Eupatorium perfoliatum, family Compositae 拉丁名Eupatorium perfoliatum,菊科 ■(Brit.)the common comfrey, the ground-up root of which was formerly used as a ‘plaster’ to set broken bones (英)聚合草,紫草科的一种植物