Viola riviniana, the common dog-violet, is a species of flowering plant in the family Violaceae, native to Eurasia and Africa.

[1] It inhabits woodland edges, grassland and shady hedge banks.

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.

[2] Viola riviniana was voted the county flower of Lincolnshire in 2002, following a poll by the wild plant conservation charity Plantlife.

[6] This species hybridises with early dog-violet (V. reichenbachiana) to produce Viola × bavarica.