Ruellia drummondiana (syn. Dipteracanthus drummondianus Nees), also known as Drummond's wild petunia, is a flowering plant endemic to central Texas in the United States.Natural Resources Conservation Service. (n.d.). Ruellia drummondiana (Nees) A. Gray. USDA Plants Database. U.S. Department of Agriculture. https://plants.usda.gov/home/plantProfile?symbol=RUDR It was first collected by naturalist Thomas Drummond and first described in 1847.LONG, R. W. (1966). GENETIC AND MORPHOLOGICAL RELATIONSHIPS OF THE TEXAS ENDEMIC RUELLIA DRUMMONDIANA (ACANTHACEAE). SIDA, Contributions to Botany, 2(6), 419–427. http://www.jstor.org/stable/41966313 R. drummondiana stands up to 3' with an herbaceous dark green ridged stem and purple flowers. Ruellia drummondiana. Lady Bird Johnson Wildflower Center – The University of Texas at Austin. (n.d.). https://www.wildflower.org/plants/result.php?id_plant=rudr#:~:text=Size%20Notes%3A%20Up%20to%20about,Flower%3A%20Flowers%2042%20mm%20long. Unlike the majority of Ruellia in the United States, R. drummondiana produces fruit with only 2–4 seeds, as opposed to 6–20 as is common throughout the genus.
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