One of the commonest weeds in pastures, or on commons, roadside wastes, and often on lawns, is the Yarrow. Its leaves, as its second popular name indicates, are cut up into a large number of segments; these are very slender and crowded, and are again cut up; so that the general aspect of the leaf is exceedingly light and feathery. This is especially the case with the leaves (radical) that spring directly from the creeping root; those given off by the flowering stem become more simple as they near the summit. Unlike as the flowers may at first sight appear to those of the Daisy and Dandelion, those of the Yarrow are also composites. The yellowish disc-florets are tubular, and contain both anthers and stigmas; the white or pink ray-florets are pistillate only. It abounds on all commons, pastures and wastes, flowering from June till the end of the year. There is one other British species,

The Sneezewort (A. ptarmica), which is almost as widely distributed. Its flower-heads are much fewer than in Yarrow, and its leaves are more simple in character, the edges being merely cut into teeth. The disc-florets are more green than yellow. It is about a month later than Yarrow in coming into flower, but thereafter the two species keep time together. The name Achillea was given to the genus in honour of Achilles, who is reputed to have used Yarrow for the purpose of staunching his wounds.