Wild Petunia - Ruellia sp.
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Flowers: Trumpet shaped, purplish blossoms that are nearly 2 inches across at the opening [Loughmiller].
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Leaves: Opposite, 2-5 inches long, narrowed at the base [Loughmiller].
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Perennial.

Sources
Loughmiller. Texas wildflowers.
Photo: Courtesy of S. Peregrine Johnson

