1、 Different flowers:

Viola flowers are lighter in color, revealing a pink purple appearance. The petals are symmetrical, mostly axisymmetric. The flowering period is as early as about April. The calyx edge under the flower is arranged with incisions like teeth

The flower color of Viola is dark, dark purple or blue purple. The petals are not symmetrical. The flowering period is later than the former. It will open about after the failure of Viola, and the edge of calyx is relatively round and smooth or truncated

2、 Different blades:

The former has a long petiole without narrow wings, 1-4.5 cm long, and is a little like a heart in shape

The latter has longer leaves, shorter petioles and narrow wings