Foliage is alternate, simple, light green, serrated and lightly hairy on the lower surface. But there are some that have leaves that are deeply dissected. There are several cultivars with purple foliage, Prairie Fire is a popular one in colder climates.
Flowers are large, generally with 5 petals, white, pink or red. Some early and some late.
There are some cultivars that I can spot a long way away, Klem's Improved Bechtel is one of them. The flowers are very large, almost flat and a pretty pink, they almost look fake.