Spiranthes diluvialis is a rare species of orchid known as Ute lady's tresses (also, Ute ladies'-tresses). The species name diluvialis means "of the flood". It is native to the western United States, where there are scattered, mostly small occurrences in the states of Colorado, Idaho, Montana, Nebraska, Nevada, Utah, Washington, and Wyoming. Two occurrences were discovered in southern British Columbia in 2006. The plant faces a number of threats to its existence. It is a federally listed threatened species of the United States but was proposed for delisting in 2025.

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