A tufted perennial, spreading by slender rhizomes, often forming mats or low mounds. Stems decumbent to ascending, usually about 10-15cm long but sometimes twice this. Leaves oblong to suborbicular, about 1cm long, glabrous. Flowers l-2cm long and wide, usually pink, in dense terminal clusters of up to six. Atlantic coast of Europe (inc. British Isles) and the Azores, on grassy slopes and cliffs.