Any of several plants of the genus Eupatorium in the composite family, especially the eastern North American species E. perfoliatum, having opposite leaves united around the stem and clusters of small, white flower heads.

• 贯叶泽兰菊科泽兰属任一种植物，尤指北美洲东部的环绕着茎长着对生叶和许多簇小白花穗的贯叶泽兰