Ruellia is a genus of flowering plants in the family Acanthaceae, commonly known as wild petunias. These plants are native to tropical and subtropical regions, particularly in the Americas. They are characterized by their vibrant, tubular flowers that can be purple, blue, or white, and their lush green foliage. Ruellia species are often used in gardens for ornamental purposes due to their attractive blooms and ability to thrive in various soil types. Many species of Ruellia are also valued for their low maintenance and drought resistance, making them suitable for xeriscaping. Some common varieties include Ruellia simplex and Ruellia brittoniana, which are popular in landscaping. Additionally, these plants can attract pollinators like bees and butterflies, contributing to local biodiversity.