Plants form a low, fast-spreading mat of silvery grey leaves. Leaves lanceolate to linear-lanceolate with margins rolled under. Flowers white, in lax clusters 15 to 25 mm, petals deeply notched.

Banks, rocky habitats and walls.

Flowers in late spring and summer.

Perennial.

Widespread in Britain.

Occasional in Leicestershire and Rutland. In the 1979 Flora survey of Leicestershire it was found in 38 of the 617 tetrads.

In the current checklist (Jeeves, 2011) it is listed as Alien; scarce