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Can see different leaves now- nearly cordate Oops again! :(
Apart from geographical probability, how can one tell this is not Myosoton? I cannot count the styles or see if it is glandular, but I cannot see any stalked lower leaves which the Stellaria should have.
I would say big branched inflorescences (coupled with early flowering relative to Myosoton and, as you say, location)
Lat/Lng: 55.967, -2.7046
OS grid ref: NT561751
on riverside at Hailes Castle