With Clematis like this, the petals are actually 'repurposed' leaves so they may open as green photosynthetic structures, especially the outer ones. Its part of their attraction, might not occur another year with different conditions.
Yes, it is a flower, but leaves and petals are botanically very similar. I grow plenty of clematis, they often have green flowers, particularly the double ones. Your photos look perfectly normal , nothing to worry about.
Just to keep you updated in case anyone is interested. Here's the latest pic of the clematis. Opened a little further but plenty left to go. The petals still look like leaves. I can't recall ever seeing anything like this before.
Hopefully in future years you will get more conventional looking flowers with colourful petals (technically, these are tepals, not petals. Hellebores do something similar. They are closely related)
We live and learn and isn't it wonderful that we want to? I've never heard of tepals, thank you for the information Kate 7, I'll pass it on to my friend.
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