Ruellia plants, commonly known as Mexican petunias, are vibrant flowering plants known for their attractive, long-lasting blooms in shades of blue, purple, pink, or white. They are popular in gardens due to their hardiness, adaptability to various conditions, and ability to attract pollinators like bees and butterflies. 

Key characteristics of Ruellia plants:

Flowers: Trumpet-shaped, with colors ranging from blue and purple to pink and white. 

Leaves: Lance-shaped, dark green, and typically 6 to 12 inches long. 

Growth habit: Perennial plants that can grow up to 3 feet tall, forming colonies or clumps. 

Native range: Native to Mexico and South America but have naturalized in many other regions. 

Growing conditions: Thrive in full sun to partial shade and prefer well-draining soil. 

Maintenance: Relatively low-maintenance, drought-tolerant, and adaptable to various climates. 

Other names: Also known as Mexican petunia or Britton's wild petunia. 

Specific examples:

Ruellia simplex: A common species with blue or purple flowers, often used in landscaping. 

Ruellia rosea: A species with pink flowers, known for its vibrant color and ability to attract pollinators. 

Ruellia tuberosa: A species with blue or purplish-blue flowers, known for its tuberous roots and medicinal uses. 

In summary, Ruellia plants are a beautiful and versatile addition to any garden, offering a splash of color with their attractive flowers and requiring relatively little care.