Common Milkwort (Polygala vulgaris)
This plant is common and is present throughout the British Isles. It will reach a height of 30cm but is also a prostrate multi-stemmed perennial. It is found in all but the most acid of grasslands. The flowers are 6-8mm in length and can be blue, pink or white. It has narrow, pointed leaves which alternate along the stems. It flowers continuously from May until September.