We also run across these yellow flowered members of the Aster family (Asteraceae). We have seen them before along with Leucojum (see earlier postings). Their sessile leaves almost make them look like a succulent, such as hens and chickens (Sempervivum) when they flower!
Who knows what they are? Post your comment!
Disclaimer: This blog is not an official University of Minnesota or Fulbright Program blog. The views expressed are my own and not those of the Fulbright Program, the U.S. Department of State or any of its partner organizations, or the University of Minnesota.