Spiranthes cernua (Linnaeus) L.C. Richard. Nodding Ladies'-tresses. Phen: Jul-Nov. Hab: Bogs, swamps, ditches, usually in acidic, sphagnous situations. Dist: NS west to s. OH, MO, and OK, south to Panhandle FL and c. TX.

Origin/Endemic status: Native

Taxonomy Comments: Spiranthes parksii was shown to be an apomictic regional floral morph with little to no clear molecular, ecological, or phenological distinction from Spiranthes cernua. Recognition of S. parksii would render S. cernua paraphyletic. See Dueck and Cameron (2008) and Pace and Cameron (2017) for more details.

Synonymy: = K4, Hough & Young (2021), Pace & Cameron (2017); < Gyrostachys cernua (L.) Kuntze; < Ibidium cernuum (L.) House – S; < Spiranthes cernua (L.) Rich. – G, Il, K1, K3, Mo1, NcTx, NY, Pa, Tn, Va, W, WH3, WV; >< Spiranthes cernua (L.) Rich. – FNA26; < Spiranthes cernua (L.) Rich. var. cernua – C, F, GW1, RAB, Luer (1975); >< Spiranthes cernua (L.) Rich. var. cernua – ETx1, Tx, Correll (1950); > Spiranthes parksii Correll – ETx1, FNA26, Tx, Correll (1950), Hough & Young (2021), Luer (1972)

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