Large Whorled Pogonia
Scientific Name: Isotria verticillata
Taxonomy Group: Vascular Plants
Last COSEWIC Assessment: November 2011
Last COSEWIC Designation: Endangered
SARA Status: Schedule 1, Endangered
Quick Links: | Photo | Description | Distribution and Population | Habitat | Biology | Threats | Protection | Other Protection or Status | Recovery Initiatives | Recovery Team | National Recovery Program | Documents
Image of Large Whorled Pogonia
The Large Whorled Pogonia is a species of orchid which can grow to 30 cm in height. It is relatively small and inconspicuous. It has many long hairy roots which form shoots from which new plants develop. There are 5 to 6 leaves at the top of the stem, which open at the same time as the flower and continue developing during flowering and development of the fruit. The leaves are green and measure 9 cm in length by 5 cm in width. The smooth slender stem is purplish. There is only one yellow-green flower. The capsule measures 25 by 7 mm. This plant has a delicate fragrance.
Distribution and Population
The Large Whorled Pogonia occurs in the United States from New England and Michigan south to Texas and Georgia. In Canada, this pogonia occurs only in southwestern Ontario. In 1986, the two known stations in southwestern Ontario consisted of about 21 plants. A third station was found in 1987 that had over 100 plants. The last recorded sighting of a Large Whorled Pogonia at any of the three sites was in 1996, when a single plant was found.
The Large Whorled Pogonia requires rich, moist deciduous or mixed forest on sandy soil with a thick leaf litter and lots of humus. It favours a forest canopy that is relatively open.
In Canada, the Large Whorled Pogonia flowers at the end of May and the beginning of June. This plant reproduces mainly through shoots, but also through seeds. Bees are the main pollinators. The seeds are dispersed by the wind. The seeds require the presence of a specific fungi to germinate.
Habitat destruction or modification is a threat to the Large Whorled Pogonia in Canada. One site was probably eliminated after beaver activity caused flooding. Logging is a threat to other habitat areas. Trampling and collection of specimens are threats to the orchid. Low population numbers, due to the fact that this species is at the northern limit of its range, is also a limiting factor for Canadian populations of Large Whorled Pogonias.
Federal ProtectionThe Large Whorled Pogonia is protected under the federal Species at Risk Act (SARA). More information about SARA, including how it protects individual species, is available in the Species at Risk Act: A Guide.
The Large Whorled Pogonia is protected by the Ontario Endangered Species Act. Under this Act, it is prohibited to kill, harm, harass, or collect this species, or to destroy its habitat.
Provincial and Territorial Protection
Other Protection or Status
An export permit is required under the Convention on International Trade of Endangered Species of Wild Flora and Fauna (CITES).
Status of Recovery Planning
Recovery Strategies :
Name Recovery Strategy for the Large Whorled Pogonia (Isotria verticillata) in Canada
Status First posting on SAR registry
Carolinian Woodland Plants Recovery Team
Jarmo Jalava - Chair/Contact - Other
Phone: 705-760-2823 Send Email
PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.
6 record(s) found.
- COSEWIC Status Reports (1 record(s) found.)
- Response Statements (1 record(s) found.)
- Recovery Strategies (1 record(s) found.)
- COSEWIC Annual Reports (1 record(s) found.)
- Consultation Documents (1 record(s) found.)
- Recovery Document Posting Plans (1 record(s) found.)
COSEWIC Status Reports
COSEWIC Annual Reports
Recovery Document Posting Plans
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