Described as a cross between celery and parsley, this perennial herb makes a great addition to salads and soups. It's also an interesting addition to vegetable sandwiches. Try it with cucumbers on dark bread.
Lovage (Levisticum officinale) is a plant, the leaves and "seeds" or fruit of which are used to flavor food, especially in South European cuisine. It is a tall (3 to 7ft) perennial that vaguely resembles celery in appearance and in flavor. Lovage also sometimes gets referred to as smallage, but this is more properly used for celery.