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.
Groundsel (Senecio vulgaris).
We have selected this very vulgar plant as a familiar example of a genus that contains some very striking species. They all produce composite flowers, but in this common weed the ray-florets are usually wanting, and consequently the few cylindric flower-heads have a very singular appearance. The leaves are deeply cut, the lobes irregularly toothed. The flowers are succeeded by the well-known fluffy pappus attached to the seeds, which has enabled the plant to become one of the most widely
distributed in all temperate and cold climates. It is to this hoary head of seed-bearers that the genus is indebted for its
