Saintpaulia, commonly known as African violet, is a genus of six species of herbaceous perennial flowering plants in the family Gesneriaceae, native to Tanzania and adjacent southeastern Kenya in eastern tropical Africa, with a concentration of species in the Nguru mountains of Tanzania. The genus is most closely related to Streptocarpus, with recent phylogenetic studies suggesting it has evolved directly from subgenus Streptocarpella. The common name was given due to a superficial resemblance to true violets (Viola, family Violaceae).
Saintpaulias grow from 6–15 cm tall and can be anywhere from 6–30 cm wide. The leaves are rounded to oval, 2.5–8.5 cm long with a 2–10 cm petiole, finely hairy, and with a fleshy texture. The flowers are 2–3 cm diameter, with a five-lobed velvety corolla ("petals"), and grow in clusters of 3–10 or more on slender stalks (peduncles). Flower colour in the wild species can be violet, purple, pale blue, or white.
Saintpaulias are widely cultivated as house plants. Until recently, only a few of these species have been used in breeding programs for the hybrids available in the market; most available as house plants are cultivars derived from Saintpaulia ionantha (syn. S. kewensis). A wider range of species is now being looked at as sources of genes to introduce into modern cultivars.
Description taken from Wikipedia: http://en.wikipedia.org/wiki/Saintpaulia