In the same order (_Leguminosæ_) are two species of Rest Harrow, common on heaths and stony banks. One of these--the Common Rest Harrow (_Ononis arvensis_)--is a very variable plant, with pink or rose-coloured flowers that bloom from June to September. Its stem is sometimes procumbent and rooting at the base, sometimes ascending or nearly erect, and is thinly clothed on all sides by soft, spreading hairs. The leaves are usually trifoliate, with obovate or oblong, toothed leaflets, but the lateral leaflets are often very small or altogether wanting. The flowers are solitary, sessile or shortly-stalked, on short, lateral branches; and the standard (upper petal) is streaked with a darker colour. The other species, shown on Plate VI, Fig. 3, is the Spiny Rest Harrow (_O. spinosa_), which, however, is sometimes regarded as a variety of the last. Its flowers are very similar in form and colour, and appear during the same time; but the stem is erect, spiny, without runners, seldom more than a foot high, and has two longitudinal rows of hairs. Passing next to the order _Rosaceæ_, we first note the Dropwort (_Spiræa Filipendula_), of the same genus as the Meadow Sweet, frequently met with on the downs and dry pastures of England and Scotland. Its leaves are mostly radical, three or four inches long, interruptedly pinnate, with many oval or narrow segments which are themselves pinnately lobed or deeply toothed. At the base of each is a pair of stipules which are attached to the leaf-stalk throughout their length. The flowers, which appear during June and July, are white, and very much like those of the Meadow Sweet (p. 219), but are larger, without scent, and generally pink when in the bud. The height of the plant is usually from twelve to eighteen inches. In the same order we have the Tormentil (_Potentilla Tormentilla_), which is very abundant on heaths, dry pastures and stony banks, flowering from June to August. This plant has a prostrate (rarely erect) stem, from six to ten inches long, repeatedly forked, and clothed with silky hairs. The leaves are compound, with three or five deeply-toothed leaflets; the lower ones sometimes shortly stalked, but the upper always sessile. The flowers are rather small, yellow, generally with four petals, on slender peduncles arising from the axils of the leaves or from the forks of the stem.