Calyx subtended by 1 or 2 bracts, which are bilabiate. The corolla is sympetalous, with five petals, often bilabiate. Cultivars have showy white, crimson, or yellow bilabiate flowers (with two lips). The flowers are wide and slightly longer, and are bilabiate. A sympetalous flower, with bilateral symmetry with an upper and lower lip, is bilabiate.