Can species of Lacerta viridis complex hybridize at all? And if yes, then can Lacerta viridis hybridize with Lacerta bilineata, Lacerta strigata, Lacerta trilineata?
Have you seen this paper? http://onlinelibrary.wiley.com/doi/10.1111/jzs.12115/abstract. They could not unambiguously resolve whether there is gene flow in contact zones between the species or not. So, a very interesting question to dig into.