Spiranthes arcisepala M.C. Pace. Dist: NB and QC south to NC, mainly in the Appalachians, and west to s. MI and n. IN.
Origin/Endemic status: Native
Syn: = K4, Hough & Young (2021), Pace & Cameron (2017); < Ibidium cernuum – S; < Spiranthes cernua – FNA26, G, K1, K3, NE, Pa, Tn, Va, W, WV; < Spiranthes cernua var. cernua – C, GW1, RAB, Luer (1975)