| Family | Scientific Name | Common Name | Habitat | Distribution | Image |
|---|---|---|---|---|---|
| Orchidaceae | Malaxis bayardii | Appalachian Adder's-mouth | Dry, open, upland forests, shale barrens. | S. NY and se. MA south through CT, RI, NJ, PA, and VA to w. and c. NC, mostly in the mountains (but somewhat disjunct on the Coastal Plain of VA). |  |
| Orchidaceae | Malaxis brachypoda | White Adder’s-mouth, White Malaxis | Moist forests and bogs. | NL west to AK, south to sc. PA (Rhoads & Klein 1993; Rhodes & Block 2007), n. NJ (Kartesz 2010), IL, MN, and WA; disjunct in CO and CA (additionally reported by F to range south to the Mountains of TN, the documentation unknown and considered dubious). |  |
| Orchidaceae | Malaxis spicata | Florida Adder's-mouth | Maritime swamp forests, calcareous but mucky swamps in the outer Coastal Plain, spring-fed swamps, wet hammocks. | Se. VA south to FL; n. West Indies (Bahamas, Cuba, Hispaniola, Jamaica). |  |
| Orchidaceae | Malaxis unifolia | Green Adder's-mouth | Bogs, moist forested slopes, in the Sandhills in longleaf-oak-hickory forests, often rooted in moss. | NL (Newfoundland) and FL west to MN, IA, MO, e. OK, and e. TX; also in Mexico, Cuba, the West Indies, and Central America. |  |
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