D C (syn. Alyssum incanum). A short-lived perennial but sometimes behaving as an annual or biennial, 30-60cm in height. Leaves lanceolate to oblong, grey-hairy. Flowers about 5mm wide, white, in a long raceme, summer to autumn. Central and southeastern Europe, in open rocky, sandy and waste places. B. obliqua, mutabilis, stricta and orbiculata are variations on a theme except that the last named has pale yellow flowers.