Small flower

Small flower

Observation - Small flower - UK and Ireland. Description: Just one small flower in the dry sand on the beach amongst some grass. Four petals, white tinged with purple at the ends. Flower looks like Field Madder (?) but the leaves are different and I couldn't see any other similar flowers nearby.

Just one small flower in the dry sand on the beach amongst some grass. Four petals, white tinged with purple at the ends. Flower looks like Field Madder (?) but the leaves are different and I couldn't see any other similar flowers nearby.