diluvial ladies'-tresses
Spiranthes diluvialis Sheviak
Spiranthes diluvialis is a species of orchid in the Orchidaceae family, commonly known as diluvial ladies'-tresses. It is found in the western United States, including Colorado, Idaho, Montana, Nebraska, Nevada, Utah, Washington, and Wyoming, with two occurrences discovered in southern British Columbia in 2006. The species is federally listed as threatened in the U.S. and was proposed for delisting in 2025.
Description
Spiranthes diluvialis, known as diluvial ladies'-tresses, is a member of the Orchidaceae family. It is native to the western United States, where it occurs in scattered, often small populations. The species name 'diluvialis' means 'of the flood,' possibly referring to its habitat preferences. The plant is listed as a threatened species in the United States but was proposed for removal from the threatened list in 2025. Its range includes Colorado, Idaho, Montana, Nebraska, Nevada, Utah, Washington, and Wyoming, with additional populations found in British Columbia.
Other common names
Diluvim Ladies’-tressesFlood Ladies-tressesIntermountain Ladies-tressesPlateau Lady’s TressesUte Lady’s TressesUte ladies'-tressesdiluvial ladies'-tressesfloodplain ladies'-tressesstreambank ladie's-tressesUte lady's tresses
Distribution
British Columbia · Global · Colorado · Idaho · Montana · Nebraska · Nevada · Utah · Washington · Wyoming
Synonyms
Spiranthes romanzoffiana var. diluvialis
