Isotria verticillata, commonly known as the large whorled pogonia and purple fiveleaf orchid, is an orchid species native to eastern North America. Distribution The orchid's native range is across the Eastern United States in the Appalachian Mountains, the central and eastern Great Lakes region, and elsewhere from Maine south to Florida, and westward from Michigan south to Texas. It is also native to Ontario, Canada. It grows in acidic soils in forests and in peat bogs. Description Isotria verticillata is a terrestrial orchid spreading by underground rhizomes. Its leaves are green above, waxy and a bit whitened below. The flowers are yellowish-green, up to 110 mm (4.3 inches) across. References External links USDA Plants Profile for Isotria verticillata (large whorled pogonia) Isotria verticillata in Flora of North America @ efloras.org Lady Bird Johnson Wildflower Center Native Plant Information Network−NPIN: Isotria verticillata Pogonieae Orchids of Canada Orchids of the United States Orchids of Florida Orchids of Kentucky Orchids of Maryland Flora of the Northeastern United States Flora of the Southeastern United States Flora of the Appalachian Mountains Flora of the Great Lakes region (North America) Flora of Illinois Flora of Michigan Flora of Oklahoma Flora of Ontario Flora of Texas Plants described in 1805 Endangered flora of the United States Flora without expected TNC conservation status