How many petals should my Clematis have?

Back in November, I brought my Clematis indoors after I remembered it was still out on my porch. Most of the growth had died off, so I trimmed it pretty much down to the roots. It started growing back sometime in December, but it's been growing abnormally fast. I wouldn't think it would grow so fast, because it only receives indirect sunlight from an east-facing window.





All of a sudden, it started flowering, and of the 6 flowers that are opened (out of about 20 buds), 3 of them have 6 petals, 1 of them has 5 petals, and 1 of them has 4 petals. The largest flower is 3.5 inches in diameter.





I'm not sure what type of Clematis it is, but a all of the petals are a pale lavender. They are ladle-shaped, and there is a small "spike" at the end of each petal. The skin is mostly a very pale green, and the leaves are about 1 inch long by 1 inch wide and circular.





So I was wondering, is it normal for my Clematis to have different numbers of petals on different flowers?

How many petals should my Clematis have?
it`s not unusual.some clematis have single flowers in spring and doubles later in year.
Reply:clematis can have many flowers. they depend on the season. thats one thing that makes them unusual.
Reply:I'm not sure its normal, but I've got a different variety (white) that is similar. The flowers can be anywhere from 3 to 6 petals. Its covered in blooms every year and grows like a demon so I just enjoy it.