The Marsh Valerian.
In the marshes of South Britain we may often meet with the pretty Marsh Valerian (Valeriana dioica) of the Valerianaceæ. It grows from six to eight inches high, and its flowers, which bloom during May and June, are of a pale rose colour, in a terminal corymb. They are mostly unisexual, the male and female flowers growing on different plants. All have a tubular corolla, pouched at the base, with five spreading lobes; but the female blooms are more densely crowded than the males, and are of a deeper colour. The former have an inferior ovary, with a slender style and a lobed stigma; and the latter have three stamens on the corolla.
The Gentianaceæ is represented in bogs by the common Buckbean or Marsh Trefoil (Menyanthes trifoliata), the only member of its family with trifoliate leaves. This plant has a creeping stock; and its flowers, which are pink in the bud and pinkish white when expanded, are in handsome racemes on stalks from six inches to a foot in length. The calyx has five short lobes; and the bell-shaped, fleshly corolla is deeply cut into five lobes which are beautifully fringed above with delicate filaments. The time of flowering is May to July.
The Marsh Trefoil.
The Marsh Lousewort.
In the marshes, ditches, and wet meadows of most parts we may see the Red Rattle or Marsh Lousewort (Pedicularis palustris) which belongs to the order Scrophulariaceæ. It has an erect stem, from six to eighteen inches high, with reddish branches; and pinnate leaves with many oval segments more or less deeply cut. Its rather large crimson flowers are on very short stalks in the axils of the upper leaves, forming together a leafy raceme. The calyx is a broad, hairy tube, with two irregularly-toothed lips; and the corolla is much longer than the calyx, with two lips, the upper of which has four minute teeth. After flowering the calyx becomes much swollen; and the superior ovary ripens into a capsule with a few rather large seeds. This plant flowers from May to September.
Most wet places are characterised by the presence of one or more species of Willows—those water-loving trees and shrubs which constitute the genus Salix of the order Salicaceæ. Some of them almost invariably establish themselves along the banks of rivers and streams, and may often be seen in long tortuous lines which mark the positions and courses of streams that no longer exist; while others thrive best in the standing water and sodden soils of marshes and bogs. One species in particular, the Osier, is largely cultivated for its long, slender twigs, so useful in the manufacture of baskets and other wicker-work; but two or three others are valued for the same purpose, and are either specially cultivated, or pollarded with the object of securing suitable twigs for this work.