Gray rockcress

Arabis caucasica, the garden arabis or mountain rockcress (often called gray rockcress in horticulture), is a low-growing, mat-forming perennial herb of the Brassicaceae native to mountains of southeastern Europe and southwestern Asia, particularly the Caucasus, Anatolia, and the Balkans. Plants form dense cushions or carpets 10 to 30 cm tall, with rosettes of grey-green, obovate to spatulate leaves covered in branched stellate hairs giving them a frosty appearance; the margins are entire or shallowly toothed. Flowering stems bear loose racemes of fragrant, four-petaled white flowers about 1 to 1.5 cm across, typical of the mustard family. The fruit is a long, narrow silique. It grows wild on rocky slopes, cliffs, and scree, and is widely cultivated as a rock garden and ground cover ornamental, flowering in spring.