Spiranthes amesiana - Schlechter
Ames' Ladies'-tresses
Taxonomic Status: Accepted
Unique Identifier: ELEMENT_GLOBAL.2.681258
Element Code: PMORC2B210
Informal Taxonomy: Plants, Vascular - Flowering Plants - Orchid Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Monocotyledoneae Orchidales Orchidaceae Spiranthes
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Concept Reference
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Concept Reference: Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
Concept Reference Code: B99KAR01HQUS
Name Used in Concept Reference: Spiranthes amesiana
Taxonomic Comments: Kartesz (1999), Flora de Nicaragua (1982) and Wunderlin and Hansen (2001 online Atlas of Florida Vascular Plants) treat Spiranthes amesiana as a distinct species. Flora of North America (2002) places S. amesiana in S. torta, however, it is mentioned that S. amesiana may be a distinct species.
Conservation Status
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NatureServe Status

Global Status: G1G2
Global Status Last Reviewed: 14Jan2005
Global Status Last Changed: 25Sep2003
Rounded Global Status: G1 - Critically Imperiled
Reasons: Species possibly extirpated from Florida and not collected in Bahamas or Nicaragua recently (Brown, pers. comm.).
Nation: United States
National Status: NH

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Florida (SH)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Disjunct range that includes Miami-Dade County, Florida, parts of the Bahamas, and Nicaragua.

Area of Occupancy: 3-125 4-km2 grid cells
Area of Occupancy Comments: Includes pine rockland habitat.

Number of Occurrences: Unknown
Number of Occurrences Comments: Institute for Regional Conservation (IRC) lists this species as extirpated or extinct.

Number of Occurrences with Good Viability/Integrity: None (zero)

Overall Threat Impact: Unknown
Overall Threat Impact Comments: Threats to Miami-Dade County pine rocklands include habitat fragmentation, fire suppression, and invasive species.

Short-term Trend: Decline of 10-50%
Short-term Trend Comments: This species is only known from 2 collections in Miami-Dade County pine rocklands. Both collection sites have been developed. This natural community type is declining and highly fragmented in Florida. Spiranthes amesiana has not been collected in the Bahamas or Nicaragua recently (Brown, pers. comm.).

Long-term Trend: Unknown

Intrinsic Vulnerability Comments: perennial herb

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.
Environmental Specificity Comments: Pine rocklands are both narrow in range and scarce.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Disjunct range that includes Miami-Dade County, Florida, parts of the Bahamas, and Nicaragua.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States FL

Range Map
No map available.

National Distribution Outside of U.S. & Canada: Bahamas, Nicaragua
Ecology & Life History
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Basic Description: Terrestrial herb 20-50 cm tall with 1-2 linear leaves (often absent). Spike of 6-12 flowers that are green with a white apron, the lip margin lacerate.
Palustrine Habitat(s): HERBACEOUS WETLAND
Terrestrial Habitat(s): Forest Edge, Forest/Woodland, Woodland - Conifer
Habitat Comments: Rocky pine woodlands, on o÷lite in openings and along woodland margins. Also occasionally in marl prairies.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation
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Group Name: Terrestrial orchids of pine rocklands-EOSPECS

Minimum Criteria for an Occurrence: One individual.
Separation Barriers: Unburned habitat, developed and agricultural areas
Separation Distance for Unsuitable Habitat: 1 km
Separation Distance for Suitable Habitat: 1 km
Alternate Separation Procedure: N/A
Separation Justification: Seeds are windborn and capable of long-distance dispersion; however, habitat is fragmented and greatly reduced in large parts of the Florida range.
Date: 18Sep2003
Author: Norden, A.H. and L.G. Chafin
Population/Occurrence Viability
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Excellent Viability: More than 100 plants
Good Viability: 10-100 plants
Fair Viability: 2-10 plants
Poor Viability: 1 plant
Date: 11Jan2005
Author: Jenkins, A.M. and Gulledge, K.J.
U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 10Jan2005
NatureServe Conservation Status Factors Author: Jenkins, A.M. and Gulledge, K.J.

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
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  • Flora of North America Editorial Committee. 2003a. Flora of North America North of Mexico. Vol. 25. Magnoliophyta: Commelinidae (in part): Poaceae, part 2. Oxford Univ. Press, New York. xxv + 781 pp.

  • Gann, G.D., K.A. Bradley, S.W. Woodmansee. 2002. Rare Plants of South Florida: Their History, Conservation, and Restoration. The Institute for Regional Conservation, Miami, FL. 1056 pgs.

  • Hitchcock, A.S. 1951. Manual of the grasses of the United States. 2nd edition revised by Agnes Chase. [Reprinted, 1971, in 2 vols., by Dover Publications, Incorporated, New York.]

  • Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

  • Small, J.K. 1933. Manual of the southeastern flora. Two volumes. Hafner Publishing Company, New York.

  • Wunderlin, R.P. and B.F. Hansen. 2003. Guide to the Vascular Plants of Florida. 2nd edition. University Press of Florida, Tampa. 788 pp.

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