(family caryophyllaceae is a member of ...) low-growing herbs widely distributed in temperate and Arctic northern hemisphere: sandworts; distinguished from members of the genus Arenaria mainly by having four-petaled rather than five-petaled flowers
(family caryophyllaceae is a member of ...) perennial tussock-forming rock plants; of Pyrenees and mountains of northern Spain; similar to and sometimes placed in genus Lychnis
(family caryophyllaceae is a member of ...) mostly perennial herbs of northern hemisphere often with mat-forming habit; most often placed in genus Arenaria: sandworts