Besides common (regular) wheat, what other grains must be labeled as wheat allergens (because they are different varieties of wheat)? Besides wheat, what other grains contain gluten and are not...

Besides common (regular) wheat, what other grains must be labeled as wheat allergens (because they are different varieties of wheat)?

Besides wheat, what other grains contain gluten and are not appropriate for those with celiac disease? What is the difference between a milk allergy and lactose intolerance?