Family | Scientific Name | Common Name | Habitat | Distribution | Image |
Orchidaceae | Spiranthes ×kapnosperia | Smoky Ladies'-tresses | Bogs, seeps, meadows. | Sw. NC and nw. SC. | |
Orchidaceae | Spiranthes arcisepala | | Bogs, fens, seepages. | NB and QC south to NC, mainly in the Appalachians, and west to s. MI and n. IN. | 
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Orchidaceae | Spiranthes bightensis | Atlantic Ladies'-tresses | Maritime grasslands, dune swales, sphagnous lake and pond margins. | Long Island, NY, south to VA (eastern shore). | 
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Orchidaceae | Spiranthes brevilabris | Short-lipped Ladies’-tresses | Pine savannas and flatwoods. | Se. SC south to s. FL, west to se. TX. | 
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Orchidaceae | Spiranthes casei var. casei | Northern Slender Ladies'-tresses | Dry sandy soils. | NS to ON, south to nc. PA, MI, WI, and n. MN. | 
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Orchidaceae | Spiranthes cernua | Nodding Ladies'-tresses | Bogs, swamps, ditches, usually in acidic, sphagnous situations. | NS west to s. OH, MO, and OK, south to Panhandle FL and c. TX. | 
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Orchidaceae | Spiranthes eatonii | Eaton's Ladies'-tresses | Pine savannas, dry to moist pine flatwoods, submesic longleaf pine sandhills. | Se. VA south to s. FL, west to se. TX. | 
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Orchidaceae | Spiranthes floridana | Florida Ladies'-tresses | Wet pine savannas, other moist sites. | Se. NC south to sc. peninsular FL and west to TX. | 
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Orchidaceae | Spiranthes igniorchis | Fire Ladies'-tresses | Seasonally wet acidic and calcareous grasslands (typically on Basinger and Felda soil series). | Endemic to c. peninsular FL. | 
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Orchidaceae | Spiranthes incurva | | Moist to saturated situations. | NB, ON, and MN south to MA, PA, OH, s. IN, s. IL, c. MO and s. KS. | 
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Orchidaceae | Spiranthes lacera var. gracilis | Southern Slender Ladies'-tresses | Fields, meadows, pastures, woodlands. | ME, MI, WI, and KS south to GA and TX. | 
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Orchidaceae | Spiranthes lacera var. lacera | Northern Slender Ladies'-tresses | Clearings, openings. | NS and NB west to SK, south to sw. NC, w. VA, TN, and MO. The occurrence of this species in NC is documented by a specimen at DUKE, collected at 5200 feet elevation on Tusquitee bald. | 
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Orchidaceae | Spiranthes laciniata | Lace-lip Ladies'-tresses | Pond cypress depressions and savannas, swamps, maritime wet grasslands, lake margins. | NJ south to s. FL and west to se. TX. | 
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Orchidaceae | Spiranthes longilabris | Giant Spiral Orchid, Longhorn Ladies'-tresses | Wet pine savannas. | Se. NC south to s. FL and west to e. TX. | 
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Orchidaceae | Spiranthes lucida | Shining Ladies'-tresses | Sunny seepage over amphibolite, limestone, or other basic rock, moist banks and shores. | NS and ON south to NC, e. TN, sc. TN (Chester et al. 1993), c. AL, MO, and KS. The species was reported for NC by Fernald (1950) and by Small (1933), but was not treated by RAB; its occurrence in NC was verified in 1992 by its discovery in a seepage area in Ashe County. | 
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Orchidaceae | Spiranthes magnicamporum | Great Plains Ladies'-tresses | Grassy barrens and glades over limestone (or other calcareous rocks) or serpentine. | Primarily in the Great Plains, from ND south to TX, east (often as widely disjunct populations) to sw. ON, NY, se. PA, sw. VA (Ludwig 1999), KY, w. TN (Jones 2006), and nw. GA. | 
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Orchidaceae | Spiranthes niklasii | | In a diversity of habitats. | Endemic to AR and OK (Ouachita Mountains, Boston Mountains, and Crowleys Ridge). Should be looked for in n. LA and ne. TX. | |
Orchidaceae | Spiranthes ochroleuca | Yellow Nodding Ladies'-tresses | Meadows and pastures at moderate to high elevations, up to at least 1500m in elevation. | Largely northeastern, extending south in the mountains and Interior Low Plateau to w. NC, nw. SC, e. TN, and c. TN. | 
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Orchidaceae | Spiranthes odorata | Fragrant Ladies'-tresses, Marsh Ladies'-tresses | Swamps and marshes, floodplain forests, often emergent from ponded water at the time of flowering in Taxodium and Nyssa swamps. | Se. VA south to FL and west to se. TX; disjunct in c. NY (Onondaga County; McMullen et al. 2021). | 
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Orchidaceae | Spiranthes ovalis var. erostellata | Oval Ladies'-tresses | Swamp forests, bottomland forests, hammocks, ravine forests. | Var. erostellata is fairly widespread in se. North America, ranging from sc. PA, NY, MI, and IL south to Panhandle FL, s. MS, s. LA, and e. TX. | 
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Orchidaceae | Spiranthes ovalis var. ovalis | Oval Ladies'-tresses | Swamp forests, mesic ravines. | GA, TN, AR, and TX, south to n. peninsular FL, LA, and e. TX. | 
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Orchidaceae | Spiranthes parksii | Navasota Ladies-tresses | Post oak savannas. | Endemic to e. TX (Bastrop, Brazos, Burleson, Fayette, Freestone, Grimes, Jasper, Leon, Limestone, Madison, Milam, Robertson, and Washington counties). | 
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Orchidaceae | Spiranthes praecox | Grass-leaved Ladies'-tresses, Giant Ladies'-tresses | Pine savannas, swamps, bogs. | A Southeastern Coastal Plain endemic: NY (Long Island, ?), NJ (?), DE (?), MD (?), south to s. FL and west to TX. The more northern occurrences have been questioned as to identification. | 
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Orchidaceae | Spiranthes romanzoffiana | Hooded Ladies'-tresses | Swamps, bogs, shores. | NL west to AK, south to nw. PA, n. OH, n. IN, c. IL, IA, NE, n. NM, AZ, and s. CA. | 
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Orchidaceae | Spiranthes sheviakii | Old Field Ladies'-tresses | Acidic, dry-mesic successional habitats, old fields, barrens, thickets, dry-open woodland bluffs, ravine-rims. | C. NY and s. ON west to sw. MI and ne. IL, south to n. AK, east to KY/TN and s. OH. | 
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Orchidaceae | Spiranthes sylvatica | Woodland Ladies'-tresses, Pale Green Ladies'-tresses | Pine-oak forests and woodlands, dry oak-hickory forests, live oak hammocks, interdune swales, rich dry forests, other woodlands. | VA south to c. peninsular FL, west to e. TX. | 
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Orchidaceae | Spiranthes torta | Southern Ladies’-tresses, Rockland Ladies’-tresses | Pine rocklands, marl prairies, pine flatwoods. | S. FL; West Indies; s. Mexico and Central America. | 
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Orchidaceae | Spiranthes triloba | Panther Ladies'-tresses | Pine flatwoods and calcareous Florida prairies. | FL Panhandle south to s. FL, primarily along the west coast of the peninsula. Restricted to FL. | 
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Orchidaceae | Spiranthes tuberosa | Little Ladies'-tresses, Little Pearl-twist | In a wide variety of habitats, especially relatively well-drained woodlands and fields, longleaf pine sandhills, dry hammocks, dry pine flatwoods. | MA, OH, and MO south to c. peninsular FL and TX. | 
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Orchidaceae | Spiranthes vernalis | Spring Ladies'-tresses | Pine savannas, bogs, marshes, fairly dry fields. | MA to s. FL and west to TX and SD; West Indies; Mexico and Central America. | 
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