Viola adunca
 Viola adunca is a species of violet known by the common names hookedspur violet early blue violet sand violet and western dog violet. It is native to North America including the western half of the United States to New England northward throughout Canada. This is a hairy compact plant growing from a small rhizome system. The leaves are spade- or heart-shaped sometimes with broadly wavy margins. They are generally 1 to 4 centimeters long.