Member of the Acanthaceae family. Limestone wild petunia reaches a height of 1-3 feet tall, and it grows in various areas such as woodlands across the central and eastern United States. Its leaves are opposite in arrangement and ovate/lanceolate in shape. Flowers are blue-violet in color, the corolla starting narrowly in a tubular shape and spreading out into 5 lobes. Limestone wild petunia blooms from May-October.