Threatened and endangered plants are on several watch lists to try to prevent certain species and cultivars of plants from going extinct. According to U.S. Fish and Wildlife, to be on the threatened plants list, a plant must be "likely to become endangered in the foreseeable future." For a plant to be on the endangered list, it needs to be "a species that is in danger of extinction throughout all or a significant portion of its range."
Pool sprite, Amphianthus pusilus, is a threatened native plant found along granite outcrops. Typically it is seen when water stays on top of granite rocks after a rain. It is threatened because of quarrying, vandalism and vehicle traffic.
Mohr's Barbara's Buttons
Mohr's Barbara's buttons, Marshallia mohrii, is a threatened native plant found in grass sedge areas. Typically it is seen on wet sandy clays in the sedge and in stream margins that are shale-bedded. Today it is threatened because of roadside right-of-ways, development of agriculture and from road expansion.
Mat-florming quillwort, Isoetes tegetiformans, is an endangered native plant found in granite outcrops. Typically it is seen on the rocks after a rain where rainfall has pooled less than 12 inches deep. Today it is endangered due to fire, cattle, vehicle travels and quarrying.
Pondberry, Lindera melissifolia, is an endangered native plant found in pond areas. Typically it is seen in sandhill ponds; wet, low areas; and cypress ponds. It is usually found around hardwoods. Today it is endangered due to cattle, drainage ditching and a lack of proper seed production.
Swamp pink, Helonias bullata, is a threatened native plant found in swamps. Typically it is seen in mountain bogs. It is found among such plants as pitcher plants and mountain laurel. Today it is threatened due to the loss of wetlands, overcollecting, and sewage treatment discharge.