Place green beans in a steamer basket in a large saucepan. Add water to saucepan to just below the basket. Bring to boiling. Steam, covered, for 8 to 10 minutes or until beans are crisp-tender.
In a large nonstick skillet heat oil over medium heat. Add garlic; cook and stir for 30 seconds. Stir in lemon peel, salt, and pepper. Add arugula and green beans. Cook for 1 to 2 minutes or until arugula is wilted and beans are coated, tossing occasionally. Serve with lemon wedges.