Viola riviniana, the common dog-violet, is a species of the genus Viola native to Eurasia and Africa.<ref name=GRIN>Template:GRIN</ref> It is also called wood violet<ref name=GRIN/> and dog violet.<ref name=GRIN/> It is a perennial herb of woodland edges, grassland and shady hedge banks. It is found in all soils except acid or very wet.
Viola riviniana was voted the county flower of Lincolnshire in 2002, following a poll by the wild plant conservation charity Plantlife.<ref>Plantlife website County Flowers page Template:Webarchive</ref>
Template:Expand section Its leaves are usually hairless.
- sweet violet (Viola odorata) – fragrant; all the leaves are located at the base of the plant; stipules are gland-tipped.
- heath dog violet (Viola canina) – clear blue flowers; narrower leaves; smaller teeth on the stipules.
- marsh violet (Viola palustris) – found in wet places; leaves are kidney-shaped; grows from underground creeping stems; dark-veined flowers; stipules without teeth.
- alpine violet (Viola labradorica) – V. riviniana is sometimes sold by nurseries as V. labradorica.
This species hybridises with early dog-violet (V. reichenbachiana) to produce Viola × bavarica.
- Partridge, James (2007) Viola × bavarica: the punctual Dog-violet BSBI News 106:8–9 (illustrated with colour photographs on inside back cover of this edition)