Spiranthes niklasii M.C. Pace. Dist: Endemic to AR and OK (Ouachita Mountains, Boston Mountains, and Crowleys Ridge).
Origin/Endemic status: Endemic
Synonymy: = K4, Hough & Young (2021), Pace & Cameron (2017); < Spiranthes cernua (L.) Rich. – Ar, FNA26, K1, K3, Luer (1975)
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