bristly locust

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

• noun A shrub (Robinia hispida) in the pea family, native to the southeast United States, having bristly branches and clusters of pale purple or rose flowers.

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

• noun large shrub or small tree of the eastern United States having bristly stems and large clusters of pink flowers