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 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.

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References

★ Blamey, M. & Grey-Wilson, C. (1989). ''Flora of Britain and Northern Europe''. Hodder & Stoughton. ISBN 0-340-40170-2.