Ramps, Allium tricoccum, look like spring onions (scallions) but have a stronger flavor of garlic and onion. Use as you would any spring onion but typically you'll use less because of the strong taste. Ramps grow wild in North America from South Caroline all the way north into Canada. The wild leeks are gathered from late winter to early spring.
You can learn more about finding, using, and growing ramps here.