| Graphorchis Thouars, 1822 |
| Graphorchis maculata (Lindl.) Kuntze, 1891 |
| Graphorkis Thouars, 1809 |
| Graphorkis graminea (Lindl.) Kuntze, 1891 |
| Greenwoodia Burns-Bal., 1986 |
| Greenwoodia sawyeri (Standl. & L.O. Williams) Burns-Bal., 1986 |
| Greenwoodiella Salazar, Hern.-López & J. Sharma, 2016 |
| Greenwoodiella deserticola Salazar, Hern.-López & J. Sharma, 2016 |
| Greenwoodiella micrantha (Lex.) Salazar & R. Jiménez, 2016 |
| Greenwoodiella micrantha var. garayana (R. González) Salazar & R. Jiménez, 2016 |
| Greenwoodiella micrantha var. micrantha (Lex.) Salazar & R. Jiménez, 2016 |
| Greenwoodiella wercklei (Schltr.) Salazar & R. Jiménez, 2016 |
| Guarianthe Dressler & W.E. Higgins, 2003 |
| Guarianthe aurantiaca (Bateman ex Lindl.) Dressler & W.E. Higgins, 2003 |
| Guarianthe bowringiana (O'Brien) Dressler & W.E. Higgins, 2003 |
| Guarianthe bowringiana (O'Brien) Archila, 2014 |
| Guarianthe hennisiana (Rolfe) Van den Berg, 2015 |
| Guarianthe patinii (Cogn.) Dressler & W.E. Higgins, 2003 |
| Guarianthe skinneri (Bateman) Dressler & W.E. Higgins, 2003 |
| Guarianthe x guatemalensis (T. Moore) W.E. Higgins, 2004 |