1. Spinach: Great source of beta-carotene, vitamin C, folate, iron, potassium, and calcium.
2. Sweet Potatoes: Loads of potassium, vitamin C, beta-carotene, and fiber.
3. Collard greens: Superb source of beta-carotene, member of the cruciferous family of vegetables, known for their cancer prevention power, loads of vitamin C and folate, good source of calcium and fiber.
4. Carrots: Loads of beta-carotene, and fiber.
5. Sweet Red Pepper: A great source of vitamin C, beta-carotene, and fiber.
from here:
http://health.ivillage.com/eating/ewproduce/0,,445g,00.html