Greater stitchwort - Tursarain-mhòr - Stellaria holostea
What looks like two petals is in fact one petal with a very deep incision. In consequence the petals are very delicate. You can see one petal is broken in half in photo 1. That photo also shows two blooms about to open, and several buds.
Each flower has a total of 5 petals.
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