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 sandy seashores. The habit is erect or ascending. The rootstock is cylindrical, woody, twisted. The plant is bluish-green, hairless. The stems are numerous, tufted, naked, scarred below, branched, leafy above. The leaves are inversely egg-shaped, lance-shaped, blunt, leathery, alternate, scattered, spreading, acute or blunt-pointed, entire. The bracts are triangular, or kidney - shaped to heart-shaped, broader than long, keeled, abrupt. The flower-heads are in umbels of 3-5 rays, forked, the invol-ucral lobes 4, moon-shaped, long-horned. The capsules are rough at the angles or on the backs of the valves, faintly keeled. The seeds are whitish, with brown pits, and netted, opaque, the cuticle brown, the caruncle large. The plant is 6-18 in. high, flowering between April and September, and is a herbaceous perennial.
The habitat of this plant is sandy seashores. The habit is erect or ascending. The plant is bushy, reddish or bluish-green. The rootstock is wood)-, tough. The barren stems are numerous, naked, with tubercles below. The leaves are pale-green, thick, leathery, overlapping, entire, elliptic, oblong, lance-shaped, the radical linear to inversely egg-shaped, oblong, the upper egg-shaped. The bracts are broadly heart-shaped, broader than long. The flowering stem is about 1 ft. high. The flower-heads are in umbels of 5-8 forked rays, short, stout. The involucres are stalkless or stalked, with 3-4 short points. The capsules are leathery, wrinkled, lobed, with rough valves with a dorsal depression. The seeds are egg-shaped, dotted, whitish, with a very small caruncle. The plant is 9-18 in. in height, flowering between July and October, and is a herbaceous perennial.
The habitat of this plant is sandy shores, loose sand, shingle. The habit is prostrate, then ascending. The plant is bluish-green or purplish. The stems are numerous, forked, dividing into two forks repeatedly, spreading from the base. The leaves are opposite, half heart-shaped, with stipules (egg-shaped, divided into two nearly to the base) nearly entire, leathery, shortly stalked, blunt or notched, the base auricled on one side, blunt on the other, hairless. The flowerheads are solitary, the involucres in the axils or forks, shortly stalked, with oblong glands. The capsule is keeled, with smooth, hairless valves. The seeds are white, and have no caruncle. The plant is 2-10 in. in height, flowering between July and September, and is a herbaceous annual.