The Billy L. Turner Plant Resources Center herbaria contains over 1 million specimens, making it among the largest herbaria in the southwestern United States. The facility ranks 13th in size across the nation. About a quarter of the specimens were collected in Texas, the largest holdings of Texas plants in the world. Nearly half of the specimens are from Latin America, with an especially strong representation from Mexico and northern Central America. Presently the number of new specimens accessioned into the Plant Resources Center’s herbaria is growing at an approximate rate of 7,000 per year.