Isotria verticillata

Isotria verticillata

Scientific Classification
Kingdom: Plantae
Division: Magnoliophyta
Class: Liliopsida
Order: Asparagales
Subfamily: Vanilloideae
Tribe: Pogonieae
SubTribe: Pogoniinae
Genus: Isotria
Species: I. verticillata
Binomial name
Isotria verticillata
(Willd.) Raf. 1808

Isotria medeoloides, is cool growing terrestrial orchid found in temperate Eastern North America.


The plant blooms in the early spring to summer with a single that can be up to 6.25 cm wide. Flowers are pollinated by bees. Flowers are scented.

Listed as a Threatened species by the U.S. Fish and Wildlife Service, and listed as an endangered species by most states or provinces within its range. Sometimes confused with the common Indian cucumber (Medeola virginiaca), which has similar whorled leaves, and grows in similar habitats.


Its range is from southern Maine south to Georgia and west to southern Ontario, Michigan, and Missouri at elevations of 280 to 700 meters. Habitat includes hardwood or conifer-hardwood forests, often in leaf litter along small "braided" intermittent streams.



Common Names: Whorled Pogonia


  1. *Arethusa verticillata Muhl ex Willd. 1805
  2. Odonectis verticillata (Muehl. ex Willd.) Raf. 1808
  3. Pogonia verticillata [Muhl ex Willd.] Nutt. 1818


  • Pollination in the Genus Isotria (Orchidaceae) Loyal A. Mehrhoff, III, American Journal of Botany, Vol. 70, No. 10 (Nov. - Dec., 1983), pp. 1444-1453
  • Gleason, H.A. and A. Cronquist.1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. New York Botanical Garden, Bronx, New York.
  • Radis, R.P. 1983. Endangered, Threatened, Vulnerable, and Rare Vascular Plant Species of the Delaware Water Gap National Recreation Area. U.S. Department of the Interior, National Park Service, Philadelphia, Pennsylvania.

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