Elevation 1430 m. July 2013, I think it is Cerastium arvense subsp. strictum. It could even be Cerastium semidecandrum????? All help appreciated.
The petals should be shorter or around the same length as the sepals in C. semidecandrum. (whereas in C. arvense the petals are roughly 2x as long as the sepals. So it looks more like C. arvense.
