Matthew C. Pace

Spiranthes perexilis, the languid ladies’-tresses, is a species of orchid native to California and Oregon.

Spiranthes niklasii, also known by the common name Niklas' ladies' tresses, is a terrestrial orchid nearly endemic to the Ouachita Mountains in Arkansas and Oklahoma with a few other known populations.

Spiranthes incurva, the Sphinx ladies' tresses, is a species of flowering plant in the family Orchidaceae. This orchid is native to the upper Midwest and Great Lakes Basin of North America. The species was originally described as Ibidium incurvum Jenn. in 1906. 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. magnicamporum.

Spiranthes bightensis, the Atlantic ladies tresses, is a terrestrial orchid native to coasts of the north-eastern United States.

Spiranthes arcisepala, the Appalachian ladies' tresses, is a species of flowering plant in the family Orchidaceae. This orchid is native to eastern North America. Long treated as part of Spiranthes cernua the species complex was reevaluated and Spiranthes arcisepala established as a separate species in 2017.

Spiranthes × kapnosperia, the smoky ladies' tresses, is a species of orchid growing in the Eastern United States. This species is documented in New York (state), Ohio, Illinois, Tennessee, North Carolina, and South Carolina.

Spiranthes igniorchis, or fire ladies' tresses, is a species of orchid endemic to Florida.

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