Viola Palustris

This diminutive, and rarely encountered gem lives in damp and even wet, boggy spots in moist meadows, marshes, and stream banks in northern parts of North America and Eurasia. In the UK it is confined to cold, high moorland areas where it displays its short-stemmed, pale lilac flowers over spreading mats of small cordate leaves. In the right spot it will slowly spread, stem-rooting, to make a low carpet of leaves and flowers.