GENUS |
ABBREVIATION |
COMPOSITION |
| Galeandra | Gal | Natural |
| Galeansellia | Gslla | Aslla x Gal |
| Galeopetalum | Gptm | Gtla x Z |
| Galeorchis | Glrchs* | Natural |
| Galeosepalum | Glspm | Glta x Zspm |
| Galeottia | Glta | Natural |
| Gastisia | Gsta | Gchls x Lsa |
| Gastisocalpa | Gscpa | Gchls x Lsa x Pmcpa |
| Gastritis | Gtts | Dor x Gchls |
| Gastrochiloglottis | Gchgl | Gchls x Trgl |
| Gastrochilus | Gchls | Natural |
| Gastrorchis | Gstrch* | Natural |
| Gastrosarcochilus | Gsarco | Gchls x Sarco |
| Gastrostoma | Gstm | Cleis x Gchls |
| Gastrothera | Gsrth | Gchls x Ren |
| Gauntlettara | Gtra | Bro x Ctps x Lps |
| Geodorum | Geod | Natural |
| Georgeblackara | Gbka | Comp x Lchs x Onc x Rdza |
| Gerberara | Gba | B x Diacm x L |
| Gigara | Gigara | Bapt x Comp x Rdza |
| Gladysyeeara | Glya | B xBro x C x Ctps x Diacm x Epi x L x Soph |
| Glanzara | Glz | Dor x Phal x Rhy |
| Goffara | Gfa | Lsa x Rhy x V |
| Gohartia | Ghta | Gom x Lhta |
| Gomada | Gmda | Ada x Gom |
| Gomesa | Gom | Natural |
| Gomettia | Gmtta | Comp x Gom |
| Gomochilus | Gmch | Gom x Lchs |
| Gomoglossum | Gmgm | Gom x Odm |
| Gongora | Gga | Natural |
| Goodaleara | Gdlra | Brs x Cda x Milt x Odm x Onc |
| Goodyera | Gdyra | Natural |
| Gottererara | Gott | Asctm x Ren x Vdps |
| Grammangis | Gramm | Natural |
| Grammatocymbidium | Grcym | Cym x Gram |
| Grammatoheadia | Grda | Brom x Gram |
| Grammatophyllum | Gram | Natural |
| Grammatopodium | Grtp | Cyrt x Gram |
| Graphiella | Grpla | Cymla x Grks |
| Graphorkis | Grks | Natural |
| Grobya | Grobya* | Natural |
| Gumara | Gum | Diacm x Epi x L |
| Habenaria | Hab | Natural |
| Haemaria | Haem | Natural |
| Hagerara | Hgra | Dor x Phal x V |
| Hagsatera | Hgstra | Natural |
| Hamelwellsara | Hmwsa | Agn x Btmna x Otst x Z x Zspm |
| Hamiltonara | Hmtn | Ada x Brs x Cda x Odm |
| Hanesara | Han | Aer x Arach x Neof |
| Haraella | Hrlla | Natural |
| Hartara | Hart | Bro x L x Soph |
| Hartwegia | Hrtwg* | Natural |
| Hasegawaara | Hasgw | B x Bro x C x L x Soph |
| Hattoriara | Hatt | B x Bro x C x Epi x L |
| Hausermannara | Haus | Dor x Phal x Vdps |
| Hawaiiara | Haw | Ren x V x Vdps |
| Hawkesara | Hwkra | C x Ctps x Epi |
| Hawkinsara | Hknsa | Bro x C x L x Soph |
| Helcia | Hlc | Natural |
| Helpilia | Hpla | Hlc x Trpla |
| Herbertara | Hbtr | C x L x Schom x Soph |
| Herschelia | Hers | Natural |
| Herscheliodisa | Hrds | Hers x Disa |
| Herschellanthe | Hrslth* | Natural |
| Hexadesmia | Hex | Natural |
| Hexisea | Hxsa | Natural |
| Higashiara | Hgsh | C x Diacm x L x Soph |
| Hildaara | Hdra | Bro x Lps x Schom |
| Himoriara | Hmra | Asctm x Phal x Rhy x V |
| Hintonella | Hntnll* | Natural |
| Hippeophyllum | Hpphy* | Natural |
| Holcoglossum | Hlcgl | Natural |
| Holttumara | Holtt | Arach x Ren x V |
| Homalopetalum | Homal | Natural |
| Hookerara | Hook | B x C x Diacm |
| Houlletia | Houll | Natural |
| Howeara | Hwra | Lchs x Onc x Rdza |
| Hueylihara | Hylra | Neof x Ren x Rhy |
| Hugofreedara | Hgfda | Asctm x Dor x King |
| Hummelara | Humm | Bark x B x Epi |
| Huntleanthes | Hnths | Cnths x Hya |
| Huntleya | Hya | Natural |
| Hybochilus | Hybch* | Natural |
| Hygrochilus | Hygrch | Natural |
| Hymenorchis | Hyrch* | Natural |
| Hyntleya | Hya | Natural |