| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| GUKA2 | Gunnera kauaiensis Rock | 'ape'ape | Gunneraceae
|
| GUMA | Gunnera makahaensis St. John | Gunnera petaloidea | Gunneraceae
|
| GUMA3 | Gunnera manicata Linden | giant rhubarb | Gunneraceae
|
| GUMA2 | Gunnera mauiensis (Krajina) St. John | Gunnera petaloidea | Gunneraceae
|
| GUMO2 | Gunnera molokaiensis St. John | Gunnera petaloidea | Gunneraceae
|
| GUPE | Gunnera petaloidea Gaud. | haha | Gunneraceae
|
| GUTI | Gunnera tinctoria (Molina) Mirbel | Chilean gunnera | Gunneraceae
|
| GUNNE | Gunnera L. | gunnera | Gunneraceae
|
| GUAR | Gutierrezia arizonica (Gray) M.A. Lane | Arizona snakeweed | Asteraceae
|
| GUBR2 | Gutierrezia bracteata Abrams | Gutierrezia californica | Asteraceae
|
| GUCA | Gutierrezia californica (DC.) Torr. & Gray | San Joaquin snakeweed | Asteraceae
|
| GUDI3 | Gutierrezia diversifolia Greene | Gutierrezia sarothrae | Asteraceae
|
| GUDR2 | Gutierrezia dracunculoides (DC.) Blake | Amphiachyris dracunculoides | Asteraceae
|
| GUER2 | Gutierrezia eriocarpa Gray | Gutierrezia sphaerocephala | Asteraceae
|
| GUGL5 | Gutierrezia glomerella Greene | Gutierrezia microcephala | Asteraceae
|
| GUGL4 | Gutierrezia glutinosa (S. Schauer) Schultz-Bip. | Gutierrezia texana var. glutinosa | Asteraceae
|
| GUGY | Gutierrezia gymnospermoides Gray | Xanthocephalum gymnospermoides | Asteraceae
|
| GULE | Gutierrezia lepidota Greene | Gutierrezia sarothrae | Asteraceae
|
| GULI2 | Gutierrezia linearifolia Lag. | Gutierrezia sarothrae | Asteraceae
|
| GULI3 | Gutierrezia linearis Rydb. | Gutierrezia sarothrae | Asteraceae
|
| GULI4 | Gutierrezia linoides Greene | Gutierrezia sarothrae | Asteraceae
|
| GULO3 | Gutierrezia longipappa Blake | Gutierrezia sarothrae | Asteraceae
|
| GULU | Gutierrezia lucida (Greene) Greene | Gutierrezia microcephala | Asteraceae
|
| GUMI | Gutierrezia microcephala (DC.) Gray | threadleaf snakeweed | Asteraceae
|
| GUPE2 | Gutierrezia petradoria (Welsh & Goodrich) Welsh | San Pedro snakeweed | Asteraceae
|
| GUPO3 | Gutierrezia polyantha A. Nels. | Gutierrezia serotina | Asteraceae
|
| GUPO2 | Gutierrezia pomariensis (Welsh) Welsh | Gutierrezia sarothrae | Asteraceae
|
| GUSAM | Gutierrezia sarothrae (Pursh) Britt. & Rusby var. microcephala (DC.) L. Benson | Gutierrezia microcephala | Asteraceae
|
| GUSAP | Gutierrezia sarothrae (Pursh) Britt. & Rusby var. pomariensis Welsh | Gutierrezia sarothrae | Asteraceae
|
| GUSA2 | Gutierrezia sarothrae (Pursh) Britt. & Rusby | broom snakeweed | Asteraceae
|
| GUSE | Gutierrezia serotina Greene | late snakeweed | Asteraceae
|
| GUSP | Gutierrezia sphaerocephala Gray | roundleaf snakeweed | Asteraceae
|
| GUTE3 | Gutierrezia tenuis Greene | Gutierrezia sarothrae | Asteraceae
|
| GUTEG | Gutierrezia texana (DC.) Torr. & Gray var. glutinosa (S. Schauer) M.A. Lane | sticky snakeweed | Asteraceae
|
| GUTET | Gutierrezia texana (DC.) Torr. & Gray var. texana | Texas snakeweed | Asteraceae
|
| GUTE2 | Gutierrezia texana (DC.) Torr. & Gray | Texas snakeweed | Asteraceae
|
| GUTR2 | Gutierrezia triflora (Rose) M.A. Lane | Thurovia triflora | Asteraceae
|
| GUWR | Gutierrezia wrightii Gray | Wright's snakeweed | Asteraceae
|
| GUTIE | Gutierrezia Lag. | snakeweed | Asteraceae
|
| GUBE | Guzmania berteriana (J.A. & J.H. Schultes) Mez | Bertero's tufted airplant | Bromeliaceae
|
| GUER | Guzmania erythrolepis Brongn. ex Planch. | bejuco de sapo | Bromeliaceae
|
| GULI | Guzmania lingulata (L.) Mez | droophead tufted airplant | Bromeliaceae
|
| GUMOV | Guzmania monostachia (L.) Rusby ex Mez var. variegata (hort. ex Nash) M.B. Foster | varigated tufted airplant | Bromeliaceae
|
| GUMO | Guzmania monostachia (L.) Rusby ex Mez | West Indian tufted airplant | Bromeliaceae
|
| GUZMA | Guzmania Ruiz & Pav�n | tufted airplant | Bromeliaceae
|
| GYCA | Gyalecta carneolutea (Turner) H. Olivier | Cryptolechia carneolutea | Gyalectaceae
|
| GYER | Gyalecta erythrozona Lettau | dimple lichen | Gyalectaceae
|
| GYFL2 | Gyalecta flotowii Korber | Flotow's dimple lichen | Gyalectaceae
|
| GYFO60 | Gyalecta foveolaris (Ach.) Schaerer | dimple lichen | Gyalectaceae
|
| GYFR | Gyalecta friesii Flotow ex Korber | Fries' dimple lichen | Gyalectaceae
|
| GYGE2 | Gyalecta geoica (Wahlenb. ex Ach.) Ach. | dimple lichen | Gyalectaceae
|
| GYHE2 | Gyalecta herrei Vezda | Herre's dimple lichen | Gyalectaceae
|
| GYJE2 | Gyalecta jenensis (Batsch) Zahlbr. | dimple lichen | Gyalectaceae
|
| GYKU | Gyalecta kukriensis (Rasanen) Rasanen | dimple lichen | Gyalectaceae
|
| GYPE2 | Gyalecta peziza (Mont.) Anzi | dimple lichen | Gyalectaceae
|
| GYTR | Gyalecta truncigena (Ach.) Hepp | dimple lichen | Gyalectaceae
|
| GYALE2 | Gyalecta Ach. | dimple lichen | Gyalectaceae
|
| GYFI | Gyalectidium filicinum Mull. Arg. | gyalectidium lichen | Gomphillaceae
|
| GYRO2 | Gyalectidium rotuliforme Mull. Arg. | Asterothyrium rotuliforme | Thelotremataceae
|
| GYALE3 | Gyalectidium Mull. Arg. | gyalectidium | Gomphillaceae
|
| GYCA2 | Gyalectina carneolutea (Turner) Vezda | Cryptolechia carneolutea | Gyalectaceae
|
| GYDO | Gyalidea dodgei Vezda | Gyalidea hyalinescens | Solorinellaceae
|
| GYHY | Gyalidea hyalinescens (Nyl.) Vezda | | Solorinellaceae
|
| GYLEC | Gyalidea lecideopsis (A. Massal.) Lettau ex Vezda var. convarians (Nyl.) Vezda | | Solorinellaceae
|
| GYLEE | Gyalidea lecideopsis (A. Massal.) Lettau ex Vezda var. eucarpa (Servit) Vezda | | Solorinellaceae
|
| GYLEK | Gyalidea lecideopsis (A. Massal.) Lettau ex Vezda var. kurdistanica (Steiner) Vezda | | Solorinellaceae
|
| GYLE | Gyalidea lecideopsis (A. Massal.) Lettau ex Vezda | | Solorinellaceae
|
| GYRO3 | Gyalidea roseola (Arnold) Lettau | | Solorinellaceae
|
| GYALI | Gyalidea Lettau ex Vezda | gyalidea | Solorinellaceae
|
| GYAN2 | Gyalideopsis anastomosnas P. James & Vezda | | Gomphillaceae
|
| GYAT | Gyalideopsis athalloides (Nyl.) Vezda | | Gomphillaceae
|
| GYPI2 | Gyalideopsis piceicola (Nyl.) Vezda | | Gomphillaceae
|
| GYVA | Gyalideopsis vainioi Kalb & Vezda | | Gomphillaceae
|
| GYALI2 | Gyalideopsis Vezda | gyalideopsis | Gomphillaceae
|
| GYAL | Gyalidiopsis alnicola W. Noble & Vezda | Gyalideopsis piceicola | Gomphillaceae
|
| GYLAG | Gyminda latifolia (Sw.) Urban var. glaucifolia Small | Gyminda latifolia | Celastraceae
|
| GYLA | Gyminda latifolia (Sw.) Urban | West Indian false box | Celastraceae
|
| GYMIN | Gyminda Sarg. | false box | Celastraceae
|
| GYCO | Gymnadenia conopsea (L.) R. Br. ex Ait. f. | fragrant orchid | Orchidaceae
|
| GYMNA2 | Gymnadenia R. Br. ex Ait. f. | gymnadenia | Orchidaceae
|
| GYCL | Gymnadeniopsis clavellata (Michx.) Rydb. | Platanthera clavellata | Orchidaceae
|
| GYIN2 | Gymnadeniopsis integra (Nutt.) Rydb. | Platanthera integra | Orchidaceae
|
| GYNI2 | Gymnadeniopsis nivea (Nutt.) Rydb. | Platanthera nivea | Orchidaceae
|
| GYLU | Gymnanthes lucida Sw. | oysterwood | Euphorbiaceae
|
| GYMNA | Gymnanthes Sw. | gymnanthes | Euphorbiaceae
|
| GYSY | Gymnema sylvestre (Retz.) Schultes | miracle fruit | Asclepiadaceae
|
| GYMNE | Gymnema R. Br. | gymnema | Asclepiadaceae
|
| GYAP | Gymnocarpium appalachianum Pryer | Appalachian oakfern | Dryopteridaceae
|
| GYBR2 | Gymnocarpium �brittonianum (Sarvela) Pryer & Haufler | | Dryopteridaceae
|
| GYDI2 | Gymnocarpium disjunctum (Rupr.) Ching | Pacific oakfern | Dryopteridaceae
|
| GYDRD | Gymnocarpium dryopteris (L.) Newman ssp. disjunctum (Rupr.) Sarvela | Gymnocarpium disjunctum | Dryopteridaceae
|
| GYDRD2 | Gymnocarpium dryopteris (L.) Newman var. disjunctum (Rupr.) Ching | Gymnocarpium disjunctum | Dryopteridaceae
|
| GYDRP | Gymnocarpium dryopteris (L.) Newman var. pumilum (DC.) Boivin | Gymnocarpium robertianum | Dryopteridaceae
|
| GYDR | Gymnocarpium dryopteris (L.) Newman | western oakfern | Dryopteridaceae
|
| GYHE | Gymnocarpium heterosporum W.H. Wagner | blackspore oakfern | Dryopteridaceae
|
| GYIN | Gymnocarpium �intermedium Sarvela | | Dryopteridaceae
|
| GYJEP | Gymnocarpium jessoense (Koidzumi) Koidzumi ssp. parvulum Sarvela | Asian oakfern | Dryopteridaceae
|
| GYJE | Gymnocarpium jessoense (Koidzumi) Koidzumi | Asian oakfern | Dryopteridaceae
|
| GYRO | Gymnocarpium robertianum (Hoffmann) Newman | scented oakfern | Dryopteridaceae
|
| GYMNO | Gymnocarpium Newman | oakfern | Dryopteridaceae
|
| GYDI | Gymnocladus dioicus (L.) K. Koch | Kentucky coffeetree | Fabaceae
|