a shrubby European wormwood (Artemisia abrotanum) with yellowish flowers and fragrant leaves
See southernwood in American Heritage Dictionary 4
(sŭÞˈərn-wo͝odˌ)
noun
An aromatic southern European shrubby woody plant (Artemisia abrotanum) having finely divided grayish foliage and globose, nodding, creamy-white flower heads. Also called old man.