meadow rue

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

• noun Any of various plants of the genus Thalictrum of the buttercup family, having compound leaves and clusters of small white, yellowish, or purplish flowers with long stamens and no petals.

from The Century Dictionary.

• noun Any plant of the genus Thalictrum, especially the Old World species T. flavum.

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

• noun any of various herbs of the genus Thalictrum; sometimes rhizomatous or tuberous perennials found in damp shady places and meadows or stream banks; have lacy foliage and clouds of small purple or yellow flowers