=Violet, Viola lanceolata.=

4d. Leaves heart-shape or kidney-shape, not lobed --8.

5a. Lateral petals bearded --6.

5b. Lateral petals not bearded =Bird-foot Violet, Viola pedata.=

6a. Leaves divided to the base into linear segments
=Bird-foot Violet, Viola pedatifida.=

6b. Leaves irregularly divided into broader segments
=Hand-leaf Violet, Viola palmata.=

7a. Leaves ovate-oblong, pubescent =Violet, Viola fimbriatula.=

7b. Leaves triangular-lanceolate, usually somewhat dilated at base,
nearly or quite glabrous =Violet, Viola sagittata.=

8a. Flowers violet or blue (rarely white-flowered plants are found
with the typical blue-flowered ones) (Blue Violets) --9.

8b. Flowers white, the 3 lower petals marked with purple (White
Violets) --14.

9a. Lateral petals bearded --10.

9b. Lateral petals beardless =Great-spurred Violet, Viola selkirkii.=

10a. Foliage glabrous --11.

10b. Petioles and lower surface of leaves pubescent --13.

11a. Beard of the lateral petals with a knob at the tip of each hair
=Blue Violet, Viola cucullata.=

11b. Beard of the lateral petals not knobbed --12.

12a. Spurred petal hairy =Wood Violet, Viola affinis.=

12b. Spurred petal glabrous =Blue Violet, Viola papilionacea.=

13a. Spurred petal villous =Blue Violet, Viola septentrionalis.=

13b. Spurred petal glabrous, or with a few scattered hairs
=Common Blue Violet, Viola sororia.=

14a. Leaf-blade obviously pubescent --15.

14b. Leaf-blade glabrous or very nearly so --16.

15a. Lateral petals bearded =Sweet White Violet, Viola incognita.=

15b. Lateral petals not bearded =White Violet, Viola renifolia.=

16a. Leaf-blades strictly glabrous
=Sweet White Violet; Viola pallens.=

16b. Leaf-blades with some minute white hairs on the upper surface
near the base =Sweet White Violet, Viola blanda.=

17a. Stipules large and leaf-like, deeply pinnatifid and nearly or quite
as long as the petioles --18.

17b. Stipules small, inconspicuous, entire or toothed, and much shorter
than the petiole --19.

18a. Leaves serrate; flowers 1.5-2.5 c