| Scientific Name | Authority | Status |
|---|---|---|
| Achroanthes obtusifolia | Raf. | synonym |
| Malaxis amplexicolumna | E.W.Greenw. & R.González | synonym |
| Malaxis ophioglossoides | Muhl. ex Willd. | synonym |
| Microstylis unifolia | (Michx.) Britton, Sterns & Poggenb. | synonym |
| Orchis ophioglossoides | Walter | synonym |
| Prescottia ophioglossoides | (Muhl. ex Willd.) Spreng. | synonym |
| Microstylis unifolia var. bifolia | (Mousley) Marg. | synonym |
| Microstylis ophioglossoides | (Muhl. ex Willd.) Nutt. ex Eaton | synonym |
| Achroanthes unifolia | (Michx.) Raf. | synonym |
| Malaxis unifolia f. bifolia | Mousley | synonym |
| Microstylis ophioglossoides var. mexicana | Lindl. | synonym |
| Achroanthes laxiflora | Raf. | synonym |
| Malaxis unifolia f. variegata | Mousley | synonym |
| Malaxis grisebachiana | (Fawc. & Rendle) Fawc. & Rendle | synonym |
| Microstylis grisebachiana | Fawc. & Rendle | synonym |
| Malaxis thlaspiformis | A.Rich. & Galeotti | synonym |
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