Wyoming Ecological Services
Mountain-Prairie Region

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Federally Listed, Proposed and Candidate Species


Ute Ladies'-tresses
(Spiranthes diluvialis)

Status: Threatened

Ute Ladies'-TressesPhoto Credit: FWS


Ute Ladies'-tresses Area Of Influence

Section 7 Range Symbol

Wyoming Area Of Influence

Potential Distribution in Wyoming

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Area Of Influence

Areas Of Influence (AOI) identify areas where any project located within should consider potential effects to the Threatened, Endangered, Proposed, and Candidate species and designated and proposed Critical Habitat, in reference to Section 7 of the Endangered Species Act of 1973, as amended.  AOI typically encompass larger areas than simply where the species is known to exist because of direct and indirect effects to the species and their habitat.  It is important to consider potential effects to the species and their habitat within these larger areas.  Action agencies are encouraged to refer to the Service’s Information, Planning, and Conservation System (IPAC) or contact the FWS Wyoming Ecological Services Office for additional information.  (AOI boundaries based on the best available data at time of development.  AOI will be updated as new information becomes available).

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Species Information

Ute ladies’-tresses (Spiranthes diluvialis) is a perennial orchid, 8 to 20 inches tall, with white or ivory flowers clustered into a spike arrangement at the top of the stem.  Ute ladies’-tresses typically blooms from late July through August.  However, it may bloom in early July or still be in flower as late as early October, depending on location and climatic conditions.  Ute ladies’-tresses is endemic to moist soils near wetland meadows, springs, lakes, and perennial streams where it colonizes early successional point bars or sandy edges.  The elevation range of known occurrences is 4,200 to 7,000 feet (although no known populations in Wyoming occur above 5,500 feet).  Soils where Ute ladies’-tresseshave been found typically range from fine silt/sand, to gravels and cobbles, as well as to highly organic and peaty soil types.  Ute ladies’-tressesis not found in heavy or tight clay soils or in extremely saline or alkaline soils. Ute ladies’-tresses typically occurs in small, scattered groups found primarily in areas where vegetation is relatively open. 

Many orchid species take 5 to 10 years to reach reproductive maturity; this appears to be true for Ute ladies’-tresses (FR 57 2048).  Furthermore, reproductively mature plants do not flower every year.  For these reasons, 2 to 3 years of surveys are necessary to determine presence or absence of Ute ladies’-tresses.  Surveys should be conducted by knowledgeable botanists trained in conducting rare plant surveys.
Last updated: April 10, 2015