Mertensia maritima a species of flowering plant in the borage family known by the common names oysterleaf, oysterplant or sea bluebells. It grows on gravel ground in the Northern hemisphere, reaching north to the northern parts of Canada, Greenland and Svalbard. It is a perennial herb producing a stem approaching 50 centimeters in maximum length. The inflorescence forms a cluster of flowers which are first reddish, and later bright blue. It is found on Shetland where it is called "oysterplant" because leaves taste of oyster.