wood anemone

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

• noun Any of several anemones, especially Anemone quinquefolia of eastern North America or A. nemorosa of Eurasia, having deeply divided leaves and a showy, solitary, often white flower.

from The Century Dictionary.

• noun The wind-flower, Anemone nemorosa.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Used as a common name of two plant species of the family Ranunculaceae, Anemone nemorosa and Anemone quinquefolia.
• noun A parallel name for snowdrop windflower (Anemone sylvestris).

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

• noun common anemone of eastern North America with solitary pink-tinged white flowers
• noun European anemone with solitary white flowers common in deciduous woodlands