The Common Hedge Mustard (_Sisymbrium officinale_--order _Cruciferæ_) is a very common roadside plant, with stems and leaves so closely set with hairs that they effectually hold the dust. It bears small, yellow flowers, which appear during June and July; and it may be easily distinguished from allied plants by its long and narrow, downy, tapering pods, which lie close against the stem. Its stem grows from one to two feet high, and is freely branched. [Illustration: THE HEDGE MUSTARD.] The Felix Weed (_S. Sophia_) of the same genus is moderately common, grows to about the same height, and bears small, greenish-yellow flowers from June to August. The stem of this plant is only slightly hairy, slender, erect, and branched; and the leaves are divided in a pinnate manner, with long, narrow segments similarly cut. In this genus the sepals are longer than the petals; and the narrow, tapering fruits are constricted between the numerous seeds. The Dyer's Weed, also known as the Dyer's Rocket and the Yellow Weed (_Reseda luteola_), is a plant of a habit similar to that of the Wild Mignonette, and belongs to the same order (_Resedaceæ_), but may be distinguished from the latter by its four sepals and four petals. It owes its popular names to the fact that it was formerly employed for the purpose of dyeing woollen fabrics. This is a common wayside plant, especially in calcareous districts, and often reaches a height of three feet, flowering during July and August. Passing to the order _Caryophyllaceæ_, we note the Deptford Pink (_Dianthus Armeria_)--a downy plant, a foot or more in height, with an erect, slightly-branched stem; and very narrow, opposite leaves, from one to three inches long, joined together at the base, and mostly acute at the tip. The flowers, which bloom in July and August, are rose-coloured with white spots, and are grouped in terminal clusters, with a very narrow, pointed bract below each calyx, usually as long as the calyx itself. This plant is to be found principally on dry banks and on waste ground, but it is not common. [Illustration: THE FELIX WEED.] The Red Campion (_Lychnis diurna_) is common on the banks of wayside ditches, as well as in copses and other moist and shady places. It has a hairy stem, from one to two feet high; hairy, ovate leaves in pairs; and red (rarely white), unisexual flowers which close at night. The male and female flowers are on separate plants. The former have ten stamens; and the latter a superior ovary which ripens to a globular capsule with five teeth that spread horizontally or even curve downwards. In both the calyx is tubular, with five triangular teeth; and the petals have spreading, deeply-notched limbs. The plant flowers during June and July. [Illustration: THE DYER'S WEED.]