The Wild petunia (Ruellia humilis) belongs to Acanthaceae (the Acanthus family). It is a perennial herb that is native to the eastern and central parts of the United States. This herb grows in dryish soils in open woods, glades, prairies and fields, and up to a height of 45-60 cm. The leaves are oblong to lanceolate, olive green and up to 10 cm long. Leaves and stems are hairy. The lavender to lilac, tubular, bell-shaped flowers bloom singly or in clusters in the upper leaf axils from May to October. It has five shallow rounded lobes.