Yarrow, also known as Common Yarrow is in the Aster family.
It is a flat-topped cluster of small, whitish flowers growing at the top of a gray-green, leafy, usually hair, stem.
The flower heads are about 1/4" across, composed of 4-6 ray flowers surrounding tiny central disk flowers.
Leaves are about 6" long, very finely dissected, gray-green, fern-like, aromatic; lanceolate in outline, stalkless. The basal leaves are longer.
It grows to a height of1-3’, flowering from June-September.
It can be found in old fields, and along roadsides.
The range is most of temperate North America.
There are both native and introduced populations of this wildflower throughout North America; it is impossible to distinguish the two. Yarrow was formerly used for medicinal purposes: to break a fever by increasing perspiration, to treat hemorrhaging and as a poultice for rashes. A tea used by Native Americans to cure stomach disorders was made by steeping the leaves. The foliage has a pleasant smell when crushed.