Neottia bifolia (syn. Listera australis), common name southern twayblade, (as Listera australis) is a species of terrestrial orchid found in eastern Canada (from Nova Scotia to Ontario) and the eastern United States (from Florida west to eastern Texas and north to Vermont).Flora of North America v 26 p 587, Southern twayblade, Listera australis Lindley, Gen. Sp. Orchid. Pl. 456. 1840. Biota of North America Program, 2013 county distribution map, Neottia bifolia
References
External links US Department of Agriculture plants profile, Listera australis Lindl. southern twayblade Go Orchids, North American Orchid Conservation Center, Neottia bifolia (Raf.) ined. Southern Twayblade Go Botany, New England Wild Flower Society, Neottia bifolia, southern twayblade Florida's Native and Naturalized Orchids, Southern Twayblade (Listera australis)