sweet fern

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An aromatic deciduous shrub (Comptonia peregrina) of eastern North America, having narrow, deeply lobed, fernlike leaves and minute flowers grouped in catkinlike heads.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun mat-forming lithophytic or terrestrial fern with creeping rootstocks and large pinnatifid fronds found throughout North America and Europe and Africa and east Asia
• noun deciduous shrub of eastern North America with sweet scented fernlike leaves and tiny white flowers