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Ruellia angustifolia (brittoniana)
Is a tough, drought-resistant plant with a long bloom period. It is a smooth-textured herbaceous perennial (evergreen), and is often arranged in garden borders or in the middle and back of garden beds. Native to Mexico, it is naturalized in some areas of the Gulf South and in Texas. It grows in nearly any soil, clay or sand, and tolerates wet or dry conditions. "Mexican petunia" has attractive dark-green foliage on fleshy stems. Petunia-like flowers appear throughout the growing season, although the plant is not related to the common garden Petunia. The species will grow as tall as three feet (1 m), while dwarf varieties can be kept at 8-10 inches tall.