These are Clematis ‘Gravetye Beauty’, Clematis viorna (vasevine), Clematis clematis glaucophylla:
The two smaller flowers are known as good hummingbird nectar plants. Although described as a hummingbird plant, I believe the Gravetye is a man-made hybrid which means it probably has little nectar if any unfortunately. Clematis texensis would be the closest species and preferred hummingbird plant.
On this Viorna the flowers hang downward but it may be the way it’s growing at the moment. I’m trying to train it to grow on the string. The Glaucophylla flowers are a bit more upright.