Stems: simple, or corymbosely branched above. Leaves: narrowly oblong, bipinnately dissected into numerous small linear divisions. Flowers: in numerous heads crowded in a fas-tigiate cyme.

A plant, or rather weed, so common that every child knows its large white and pinkish flower-heads and recognizes the disagreeable pungent odour of its lace-like leaves. It is often called "Milfoil" from the abundance of its fringed foliage.

This species may readily be distinguished by its densely woolly character, and the fact that none of its bracts are dark-margined.

The Yarrow must unquestionably be of ancient origin, for it derives its name Achillea from Achilles, who is supposed to have made an ointment from it wherewith to heal his wounded warriors after the siege of Troy.

Achillea borcalls, or Dark-margined Yarrow, is not so tall or so woolly as the preceding species, the corymbs are smaller and the bracts are all dark-margined.