The leaves are heart/egg-shaped, with a sharp-pointed tip, a low cutting on the base; bare or a little bit hairy; grow by 2 or 4. The stipules have half-grown together with the leaf stalk. The flowers are dark purple, 2–3 cm long, and reach higher than the leaves. They grow up to 8–15 cm in height. Their flowers are slightly larger than those of other local violets. The flowers do not have a smell. Bog violets are under protection (protection category III).