Aliso de mar

obularia maritima, common name Sweet Alyssum or Sweet Alison, also commonly referred to as just Alyssum from the genus in which it was formerly classified, is a low-growing flowering plant in the family Brassicaceae, native to the Mediterranean region and Macaronesia (Canary Islands, Azores).
It is an annual plant (rarely a short-lived perennial plant) growing to 10-30 cm tall. The leaves are 1-4 cm long and 3-5 mm broad, oval to lanceolate, with an entire margin. The flowers are sweet-smelling white (rarely pink or lavender), with four petals; they are produced throughout the growing season, or year-round in areas free of frost (Wikipedia)