Sea Buckthorn (Hipphophae rhamnoides)

The Sea Buckthorn, as its name suggests, grows in coastal aeas, often carpeting sand dunes with an impenetrable scrub. In autumn it's conspicuous because of its bright orange berries which are rich in Vitamin C, and can be used to make jellies and sauces. They are also used medicinally to treat a range of conditions, and it's claimed they can slow the aging process.