Common Dog Violet
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Viola riviniana
Common & widespread in Britain.
Growing to 10 cm (3.9 in) tall and 50 cm (20 in) broad, this prostrate perennial has dark green, heart-shaped leaves and produces multiple violet coloured flowers in May and June.
It is the food plant of the Pearl-bordered Fritillary, Small Pearl-bordered Fritillary, Silver-washed Fritillary and High Brown Fritillary Butterflies.