Scientific Name: Triphora trianthophoros
Taxonomy Group: Vascular Plants
Last COSEWIC Assessment: November 2010
Last COSEWIC Designation: Endangered
SARA Status: Schedule 1, Endangered
Image of Nodding Pogonia
The Nodding Pogonia is a perennial herb. Its fleshy greenish-purple stem grows to a height of 5 to 31 cm. The leaves are small and round. There are 1 to 7 flowers, but only one or two open at a time. The fruit is a green capsule; each capsule contains many thousands of very small seeds.
Distribution and Population
The Nodding Pogonia occurs in the United States from New England and Michigan, south to Texas and Florida. In Canada, it is only found in southwestern Ontario. In 1998 there were two known populations in the province, a variable one in Rondeau Provincial Park in Kent County, and a smaller one in Essex County. When the Rondeau Park orchid colony was found in 1966, there were several clumps of 10-15 plants each. Between 1966 and 1986, the park's Nodding Pogonia population grew to more than 1500 plants. Over the next 10 years, yearly counts at Rondeau showed a population decline of 90%. By 1997, there were an estimated 50 orchids remaining in the park. The Essex County site was first discovered in 1950, when about 12 plants were noted. The population peaked in 1967, when 188 plants were found. The last two plants were recorded in 1985; the orchid could not be relocated there in 1998.
The Nodding Pogonia grows in rich, humid deciduous woodlands where there is a deep leaf litter. This species is both moisture-loving and shade tolerant.
The Nodding Pogonia begins appearing above the ground at the end of July. Once it appears above the ground, it grows very quickly. The flowers bloom during one day, opening in the morning and drooping by the evening. The flowers bloom in August or early September. Insects are the main pollinators. Seeds are dispersed by the wind. Germination of the seeds depends on contact with a specific fungus. Dry conditions are known to prevent flowering in this species.
Nodding Pogonia at Rondeau Park are at risk from trampling, soil compaction, and collection. Storms that damage the forest canopy can cause a reduction in the humus layer and ground moisture level, adding to the stress on the plants. Most of the Essex County site was heavily grazed until recently, which may have caused soil compaction detrimental to the orchid. Selective tree-cutting in the area thinned the canopy, causing drying and loss of humus, which further reduced the pogonia population.
Federal ProtectionThe Nodding 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 Nodding 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. This species occurs in Rondeau Provincial Park..
Provincial and Territorial Protection
Status of Recovery Planning
Recovery Strategies :
Name Recovery Strategy for the Nodding Pogonia (Triphora trianthophoros) in Canada
Status Final 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.
5 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.)
- Recovery Document Posting Plans (1 record(s) found.)
COSEWIC Status Reports
COSEWIC Annual Reports
Recovery Document Posting Plans
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