A violet flower
( Geranium maculatum )
Wood geranium - small violet flower in field or forest. The photo was taken near Moscow in Losiny Ostrov forest park. As seen at the photo it was a wee rainy, so I risked my digital camera. :)
Geranium has been used in herbal medicine, and is also grown as a garden plant.
Wiki: Wood geranium grows in dry to moist woods in spring to early summer. The flowers are 2.5–4 cm diameter, with five rose-purple, pale or violet-purple (rarely white) petals and ten stamens. The fruit capsule, which springs open when ripe, consists of five cells each containing one seed joined to a long beak-like column 2–3 cm long.