[Rosmarinus officinalis]
From it's needle like leaves and strong resinous aroma you'd almost think this was some sort of conifer, but no, it's yet another mint. This is a very powerful herb to be used with discretion, fresh or dried. Fresh is considered superior for all uses, and it's the easiest herb there is to have fresh - it grows eagerly under poor conditions and can even get out of control. Various rosemary cultivars are used as durable, almost indestructable hedges, groundcovers and decoratives here in Southern California - and it even grows well in England!
Rosemary has an affinity for meats, poultry and some vegetables when fried in olive oil, particularly potatoes but also eggplant, zucchini and tomatoes. It also has medicinal properties and is thought to help protect the brain from free radicals and possibly improve memory. It is very safe in culinary and theraputic doses but is toxic in very large amounts (how you could eat that much of it I haven't a clue) and rosemary oil or extract must be used carefully.
More on Mint Family.
Dried is available in the spice section of most supermarkets. Buy only whole leaf, never powdered. To substitute dry for fresh, or vice versa, the quantity should be roughly the same.