Citrus sinensis, commonly known as orange or sweet orange, is a small evergreen tree originally domesticated in subtropical Asia. These plants can reach up to 30' tall. Slender spines may be found at the leaf axils, particularly on new growth. The glossy, aromatic leaves are ovate in shape and can reach up to 4" long.Sweet orange contains large amounts of potassium, which might help prevent high blood pressure and stroke. The fruit and juice also contain large amounts of a chemical called citrate, which might help prevent kidney stones. Citrate tends to bind with calcium before it can form a stone.