Appearance
Its leaves are usually hairless. It is a perennial, flowering from April to June.
Naming
* sweet violet - fragrant; all the leaves are located at the base of the plant; stipules are gland-tipped.⤷ heath dog violet - clear blue flowers; narrower leaves; smaller teeth on the stipules.
⤷ marsh violet - found in wet places; leaves are kidney-shaped; grows from underground creeping stems; dark-veined flowers; stipules without teeth.
⤷ alpine violet - ''V. riviniana'' is sometimes sold by nurseries as ''V. labradorica''.
References:
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