yarrow

n. plant from the genus Achillea

Achillea millefolium or Yarrow (other common names Common Yarrow, Gordaldo, Nosebleed plant, Old Man's Pepper, Sanguinary, Soldier's Woundwort, Thousand-leaf (as its binomial name affirms), Thousand-seal) is a flowering plant in the family Asteraceae, native to the Northern Hemisphere.
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Yarrow /yar·row/ 1. any of several plants of the genus Achillea, especially A. millefolium. 2. a preparation of the above-ground parts of A. [more]Yarrow - Community and Resources

Noun
1. ubiquitous strong-scented mat-forming Eurasian herb of wasteland, hedgerow or pasture having narrow serrate leaves and small usually white florets; widely naturalized in North America
(synonym) milfoil, Achillea millefolium
(hypernym) achillea

(n.)
An American and European composite plant (Achillea Millefolium) with very finely dissected leaves and small white corymbed flowers. It has a strong, and somewhat aromatic, odor and taste, and is sometimes used in making beer, or is dried for smoking. Called also milfoil, and nosebleed.