The habitats where common dog violet~(Viola riviniana) grows:

Alpine and subalpine calcareous grassland
Altantic hazel wood
Atlantic oak wood
Beech wood
Bracken scrub
Brownfield
Caledonian forest
Dune slack
Hard cliff and cliff slope
Hedgerow scrub
High montane heath and snow bed
Limestone pavement
Lizard peninsula
Lowland calcareous grassland
Lowland dry acid grassland
Lowland dry heath
Lowland dry oak and birch wood
Lowland heath
Lowland mixed oak and ash wood
Machair sand dune
Maritime cliff
Mixed scrub
Montane dwarf shrub heath
Montane scrub
Mountain ledge
Northern hay meadow
Sand dune
Scree
Traditional orchard
Upland acid grassland
Upland birch wood
Upland calcareous grassland
Upland dry heath
Upland mixed ash wood
Upland spring flush
Wet woodland
Wood pasture
Yew wood