In the same order we have the Mints (genus _Mentha_)--strongly-scented plants with creeping rootstocks and runners; and small flowers in dense, axillary whorls, or in terminal spikes or clusters. In all the calyx has five equal teeth; and the corolla is bell-shaped, with a short tube, and four lobes of which the upper is broader. There are four erect, equal stamens; and the fruit consists of four small, smooth nuts. Three species, more or less abundant, occur in marshy or other wet places. They are:-- 1. The Round-leaved Mint (_Mentha rotundifolia_).--A moderately common, erect, hairy plant, from one to three feet high, with a powerful but hardly agreeable odour. Its stem is green, hairy, and branched; and the leaves are sessile, broadly ovate or round, blunt, wrinkled, green above, and whitish and shaggy beneath. The flowers are small, lilac (occasionally white), in dense, cylindrical, leafy spikes from one to two inches long. The bracts are rather narrow and sharply pointed, and the corolla is hairy. The time of flowering is August and September. 2. The Water Mint (_M. aquatica_).--An abundant marsh plant, from one to three feet high, flowering from July to September, possessing a strong, pleasant odour. Its stem is much branched, generally clothed with soft hairs; and its leaves are stalked, ovate, serrate, the upper ones passing into bracts which are shorter than the flowers. The latter are lilac, and form dense, terminal, oblong or globular clusters, with, frequently, two or three dense, axillary whorls beneath. The calyx is tubular, about an eighth of an inch long, with very sharp teeth. 3. The Marsh Whorled Mint (_M. sativa_).--A very similar plant, common in wet places, flowering during July and August. It grows from two to five feet high; and its elliptical, toothed leaves are hairy on both sides. The flowers are lilac, in dense, axillary whorls, without any terminal cluster. There is yet another marsh plant of the _Labiatæ_ to be considered, and that is the Marsh Woundwort (_Stachys palustris_), which is very much like the Hedge Woundwort described on p. 199. It has a stout, hollow, hairy stem, from one to three feet high; and narrow, coarsely-toothed leaves, from two to four inches long, the upper ones sessile and the lower shortly stalked. The flowers are pale purple or dull, light red, arranged in whorls of from six to ten in the axils of the upper leaves. The calyx is bell-shaped, with ten ribs and five long, acute teeth; and the lower lip of the corolla has its side lobes turned back. [Illustration: THE FORGET-ME-NOT.]