A very common weed, found everywhere; the feathery, finely dissected leaves, when the plant is small and not in flower, often mistaken by those not acquainted with it for fern leaves. It is perennial by means of root-stocks. Leaves lanceolate or oblong in outline, very finely dissected into narrow, pinnatifid segments. Inflorescence consists of dense, flat-topped clusters of numerous, small, white heads (sometimes pink or purplish), one-sixth to one-fourth of an inch broad, borne on erect stems 6 to 18 inches high. Disk flowers yellow, surrounded by four to six gray-white, or sometimes pink or purplish ray flowers; both ray and disk flowers fertile. Entire plant aromatic and pungent, but bitter to the taste.
Waste ground, fields, roadsides and various other situations throughout eastern North America; naturalized from Europe, where it is native. Flowering from June to November.
Memoir 15 N. Y. State Museum
B. Yarrow; Milfoil - Achillea millefolium