Spiranthes incurva, the Sphinx ladies' tresses, is a species of flowering plant in the family Orchidaceae.

[1][2] This orchid is native to the upper Midwest and Great Lakes Basin of North America.

[1] The species was originally described as Ibidium incurvum Jenn.

[3][4] Long treated as part of a sensu lato Spiranthes cernua, the species complex was reevaluated and Spiranthes incurva reestablished as a separate species in 2017.

Spiranthes incurva is an ancient natural hybrid of S. cernua sensu stricto and S.