Yellow flowers

What is this ?

Thank you

 

Perhaps Senecio jacobaea.

 

Yes I think you're right, thank you !

 

Really? That usually produces heads with more or less downward-angled rays on flower stems that branch from near the top of a non-branching main stalk.

 

So what else could it be ?

 

There are tens of thousands of aster family plants.

 

This is certainly a Senecio species. I am not sure, however, whether this is Senecio jacobaea. Senecio can be rather tricky in Europe. You'd probably need a location (Bordeaux area?) and good images of the leaves and the involucral bracts.

 

OK I'm in Paris now but I'll talke some new pictures next week in Bordeaux.

 

Sometimes, S. jacobaea can be very branchy, like this:
http://www.lancing-nature.bn15.net/natimages/wildflowers/ragwort9295.jpg