Flora of the Southeastern United States
2022 Edition


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Spiranthes L.C. Richard. Ladies'-tresses, Pearl-twist, Spiral Orchid.

Key to Spiranthes

A genus of about 30-40 species, mainly north temperate, but with species scattered in other areas. The Spiranthes flora of our region is still rather poorly understood, and the treatment here will undoubtedly change further.

ID notes: With few exceptions, the species cannot be identified when not in flower. Particular attention must be paid to the curvature and orientation of the lateral sepals, and various characteristics of the lip (color, papillae presence, gland shape).

Ref: Brown (2002); Dueck & Cameron (2007); Dueck & Cameron (2008); Hough & Young (2021); Luer (1975); Pace (2021); Pace & Cameron (2016); Pace & Cameron (2017); Pace et al. (2017); Pridgeon et al. (1999c); Sheviak (1991); Sheviak & Brown (2002) In Flora of North America Editorial Committee (2002a); Ward (2012a). Show full citations.

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Hover over a shape, letter, icon, or arrow on the map to see what it means. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.

image of plant© Alan M. Cressler
image of plant© Alan M. Cressler
image of plant© Keith Bradley
image of plant© Ward, Scott
image of plant© Erik Danielson source