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Stems appear to have small leaves; pappus hairs simple, white. Might be Crepis?
After nearly 2 years, your suggestion has been confirmed on Tela-Botanica as Crepis bursifolia and I am editing accordingly.
I cannot see the geographical location for this entry. Am I missing something?
Don't know why it disappeared but I have re-entered it. I hate this new system with its new tabs - what could have been simpler than scrolling down an entry to the next category with the whole page visible - rant over!! I know that you are mainly Italy/Sardinia but Tela-Botanica is excellent with very good feedback.
Interesting comments Martin - The flowers completely disappeared after lunch which led me to H.glabra, the only one in my books that refers to it only being open in sunshine. Photos taken in 2010 and remained difficult to i.d. Went back last year to get more photos but the ground had been totally cleared!