(arena, sand, where many of the species grow). Caryophylldceal. Low herbs, mostly with white fls., usually forming mats, and suitable for rockwork or alpine gardens. Only the perennial species are com monly cult. Of easiest culture in almost any soil. Prop. by division ; also by seeds, and rare species sometimes by cuttings. The species inhabit temperate and cold regions. The stamens are usually 10; styles 3 or 4; petals 5 as a rule, entire or emarginate. Nearly 200 rec ognized species. Mouogr. by F. N. Williams, Journ. Linn. Soc. 33: 326 (1897-8).