Viola Characteristics two kinds of flowers: Spring Flowers showy  cross-fertilizing perfect irregular in shape 5 petals lowest petal prolonged into a spur, sometimes bearded at the throat the 2 lateral petals frequently bearded at the base Summer Flowers remaining closed self-fertilizing (cleistogamous)

 

Violaceae Characteristics corolla irregular, 5 separate petals, with one petal spurred or sac-like