During surveys in 2009, we documented seven invasive exotic plant taxa in the Big Spring Pines Natural Area, Chubb Hollow, Long Bay Field and Long Bay at Ozark National Scenic Riverways. All species were known to occur on the park. The most widespread and abundant of the exotic plant species observed included Johnsongrass, ground ivy and Nepalase browntop. Each of these species covered seven or more acres in the park. In general, several invasive exotic plants are a major problem in the study area at Ozark National Scenic Riverways, but successful control is possible for a large group of...