Nevada Fish & Wildlife Office
Pacific Southwest Region

Ute ladies'-tresses
(Spiranthes diluvialis)

Class: Liliopsida
Order: Orchidales
Family: Orchidaceae
Genus: Spiranthes
Species: diluvialis
 
Habitat: Currently known from Colorado, Idaho, Montana, Nebraska, Nevada, Utah, Washington, and Wyoming.
 

Official Status:

Threatened
 

Life History:

Ute ladies'-tresses is a perennial, terrestrial orchid with 7 to 32-inch stems arising from tuberously thickened roots. The flowering stalk consists of few to many small white or ivory flowers clustered into a spiraling spike arrangement at the top of the stem. The species is characterized by whitish, stout flowers. It blooms, generally, from late July through August.

 

Distribution and Habitat:

 

The orchid occurs along riparian edges, gravel bars, old oxbows, high flow channels, and moist to wet meadows along perennial streams. It typically occurs in stable wetland and seepy areas associated with old landscape features within historical floodplains of major rivers, as well as in wetlands and seeps near freshwater lakes or springs. Ute ladies'-tresses ranges in elevation from 720 to 1,830 ft in Washington to 7,000 ft in northern Utah. Nearly all occupied sites have a high water table (usually within 5 to 18 inches) of the surface augmented by seasonal flooding, snowmelt, runoff and irrigation. States in which Spiranthes diluvialis is known to occur: Currently known from Colorado, Idaho, Montana, Nebraska, Nevada, Utah, Washington, and Wyoming. Countries in which Spiranthes diluvialis is known to occur: United States.

 

Threats:

 

habitat loss and modification and the orchid’s small population and low reproductive rate make it vulnerable to other threats

 

Actions / Current Information:

 

Date Citation Title
     
10/12/2004 69 FR 60605 60607 90-Day Finding on a Petition To Delist the Ute Ladies'-Tresses Orchid and Initiation of a 5-Year Review
     
01/17/1992 57 FR 2048 205 ETWP; Final Rule to List the Plant Spiranthes diluvialis, Ute Ladies'- Tresses, as a Threatened Species
     
11/13/1990 55 FR 47347 47350 ETWP; Proposal to List the Plant Spiranthes diluvialis (Ute ladies'- tresses) as a Threatened Species; 55 FR 47347 47350
     
     
     
     
Last updated: April 16, 2014