Viola canina

Viola canina (heath dog-violet or heath violet) is a species of the genus Viola, native to Europe, where it is found in the uplands of box hill in Dorset, heaths, fens, and moist woodlands, especially on acidic soils.

It is a herbaceous perennial plant growing to 5–15 cm tall. The flowers are pale blue, produced from April to July. Colonies of plants may be extensive.