GREATER STITCHWORT Stellaria holostea (Caryophyllacae).
A familiar perennial of open woodland, woodland rides and hedgerows. I photographed this example in Hoo Wood this evening. The flower has five white notched petals on slender rough-edged stems. The leaves are narrow, fresh green, rough-edged and grass-like. They can grow to a height of 50cms, and flower from April to June.