The fruits of Common Strawberry (Fragaria virginiana) may be small, but for what they lack in size, they more than make up for in flavor. Common Strawberry (also called Wild Strawberry) has seeds in shallow pits on the surface of the fruit and divided leaves consisting of three, toothed leaflets with the terminal tooth of the center leaflet being less than half the width of the adjacent teeth. Oh, and I should mention, the fruit, when ripe, smells divine, so don't forget to breathe through your nose when you're out in the field.
Woodland Strawberry (F. vesca, not pictured) is a similar species, who also has edible fruit, though I'm told the flavor of F. virginiana is superior. When I encounter a patch of Woodland Strawberry, I'll be sure to report my findings.