crown vetch

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

• noun A perennial European herb (Securigera varia syn. Coronilla varia) in the pea family, having clusters of small white or pink flowers and pinnately compound leaves and grown for forage and erosion control. It is naturalized in much of North America.

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

• noun European herb resembling vetch; naturalized in the eastern United States; having umbels of pink-and-white flowers and sharp-angled pods