I took this photo in the French Alps, Belle Plagne. It was a solitary flower, the only one near the base of Roc du Diable/ Roche de Mio in the dry area near Lac Des Blanchett at approximately 2000m.
I have tried looking through books (including Flowers of the Alps) and websites but have drawn a blank.
Any suggestions gratefully recieved as my husband is concerned that I am obsessing!
I'm not an expert on flowers but have you looked under Campanula? It seems to suggest it to me althought the pictures you supplied are quite small and difficult to see any detail.
If you Google "Campanula" and look under images, you may find the one you saw. There are many different types.
Thank you, but I did look through lots of campanula and they all seemed to have 5 petals. This was a very open bell and definately had 7 petal ends. Tried google search with 7 petals, blue petals etc. but none seemed to have 7 petals. one site showed a campanula with 6 and stated very rare.
Yes, Campanula flowers are usually pentamerous, but heptamerous ones are known, for example see the first photo of C. cenisia here - http://www.wildgingerfarm.com/Campanula.htm
Hexamerous ones (as you have found), too, eg. http://www.carpathianbasinspecies.eu/2_Vascular_Plants(Tracheophyta)/Species/Campanula_sibirica/Campanula%20sibirica4_1_logo_0.html
So, abnormality is one explanation, rare though it may be. If that is the case, we still haven't given you an ID. C. raineri is a possibility (photo further down the same page).
The other explanation is that it is not actually a Campanula, but of another genus in the Campanuloideae subfamily. Still working on this... Edraianthus comes to mind immediately, but that does not occur in the French Alps.