This section is from the book "British Wild Flowers - In Their Natural Haunts Vol5-6", by A. R. Horwood. Also available from Amazon: A British Wild Flowers In Their Natural Haunts.
The habitat of this plant is waste places near the sea. The habit is prostrate, then ascending. The plant is downy, with appressed hairs, 2-partite. The stem is woody below, stiff, leafy. The leaves are linear to lance-shaped, acute. The flowers are white, small, sweet-smelling, the calyx falling, the petals inversely ovate. The anther-stalks are all simple. The style is slender. The pods are oval, inversely ovate, round, pointed, smooth, not bordered, on slender stalks, spreading. The valves are convex, 1-nerved, the cells 1-seeded. The seeds are winged. The plant is 4-12 in. high, flowering from June to September, and is a herbaceous perennial.
The habitat of this plant is waste places, as a rule near the sea. The habit is spreading. The stem is prostrate, creeping, slightly hairy, branched, leafy. The leaves are deeply divided to the base, once or twice, with small segments, inversely ovate, spreading. The flowers are in long, slender, loose racemes, with a leaf opposite, small, white, with one on the internode below, very often apetalous, or the petals may be very short, and with 2 stamens. The style is very small. The pods or silicules are kidney-shaped, notched, the 2 lobes (hence didymd) wrinkled, on slender, spreading stalks, the seed kidney-shaped, dotted, finely-furrowed. The plant is 6 in. to 1 ft. in height, flowering between June and September, and is a herbaceous annual or biennial.
The habitat of this plant is waste ground. The habit is prostrate. The stems are much-branched, smooth. The leaves are larger than in the last, less divided nearly to the base. The flowers are small, white, in dense racemes, opposite the leaves. The petals are perfect. The pods or silicules are undivided, kidney-shaped, on slender stalks, wrinkled, crested with small sharp points. The style is prominent, awl-like. The stamens are perfect. The plant is 3-8 in. in height, flowering between June and September, and is a herbaceous annual or biennial.
This plant is always cultivated in this country, sometimes escaping from, and then found as a casual near, gardens. The plant is erect, with the rosette habit. The stem is smooth, often bluish-green, the radical leaves 1-2 pinnate, lobed, the upper stalkless, linear, entire. The flowers are white. The pods are round to oval, blunt. The seeds are triangular, with the radicle in the narrow end, and with entire cotyledons, with no endosperm. The plant is 6-18 in. in height, flowering from June to August, and is a herbaceous annual.