Rugelia
 Rugelia nudicaulis or Rugels ragwort is the sole species of the genus Rugelia which blooms in summer is a wildflower endemic to higher elevations in the Great Smoky Mountains. It is a rare species in Tennessee. It was first placed in the genus Senecio then moved to Cacalia and finally placed in a genus of its own Rugelia. Genetic diversity in this plant assessed using allozymes is so low that the species may not survive changing environmental conditions.