One of the things I like best about Bird's Foot Violet (Viola pedata) is that it grows well in waste places, locations with dry, rocky and not very fertile soil -- like on the embankment along our road out. Oddly enough, the Missouri Botanical Garden site linked above says Viola pedata is "Considered more difficult to grow than most other violets." Around here, they seem to be doing well growing and spreading with no attention from us.
On our Friday walk, we saw one Bird's Foot Violet blooming. Dozens were blooming on Saturday.
The flower's common name is based on its deeply divided leaves which somewhat resemble a bird's foot.