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 sea-cliffs. The habit is prostrate below. The rootstock is prostrate, the young shoots having triangular scales below. The stems are numerous, round in section, more or less erect, wavy, branched, spineless, the branches slender, the cladodes bristle-like, in groups, flexible. The flowers are drooping, in the axils, unisexual, yellowish-green, or dirty-white to yellow, with red veins, the males the larger. The stalk is as long as the flower, jointed in the middle. The berry is round, red, smooth, shining, 3-celIed. The seeds are large, hard, black, smooth. The plant is 6-18 in. in height, flowering in June and July, and is a herbaceous perennial.