| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| GREC | Grossularia echinella Coville | Ribes echinellum | Grossulariaceae
|
| GRGR2 | Grossularia greeneana (Heller) Coville & Britt. | Ribes victoris | Grossulariaceae
|
| GRHE3 | Grossularia hesperia (McClatchie) Coville & Britt. | Ribes californicum var. hesperium | Grossulariaceae
|
| GRHI3 | Grossularia hirtella (Michx.) Spach | Ribes hirtellum | Grossulariaceae
|
| GRHY | Grossularia hystrix (Eastw.) Coville & Britt. | Ribes menziesii var. hystrix | Grossulariaceae
|
| GRINP | Grossularia inermis (Rydb.) Coville & Britt. var. pubescens Berger | Ribes inerme var. inerme | Grossulariaceae
|
| GRIN3 | Grossularia inermis (Rydb.) Coville & Britt. | Ribes inerme var. inerme | Grossulariaceae
|
| GRIR | Grossularia irrigua (Dougl.) Coville & Britt. | Ribes oxyacanthoides ssp. irriguum | Grossulariaceae
|
| GRKL | Grossularia klamathensis Coville | Ribes inerme var. klamathense | Grossulariaceae
|
| GRLA4 | Grossularia lasiantha (Greene) Coville & Britt. | Ribes lasianthum | Grossulariaceae
|
| GRLE | Grossularia leptosma Coville | Ribes menziesii var. leptosmum | Grossulariaceae
|
| GRLO | Grossularia lobbii (Gray) Coville & Britt. | Ribes lobbii | Grossulariaceae
|
| GRMA2 | Grossularia marshallii (Greene) Coville & Britt. | Ribes marshallii | Grossulariaceae
|
| GRME | Grossularia menziesii (Pursh) Coville & Britt. | Ribes menziesii var. menziesii | Grossulariaceae
|
| GRMI2 | Grossularia missouriensis (Nutt.) Coville & Britt. | Ribes missouriense | Grossulariaceae
|
| GRNE3 | Grossularia neglecta Berger | Ribes oxyacanthoides ssp. hendersonii | Grossulariaceae
|
| GRNO | Grossularia nonscripta Berger | Ribes oxyacanthoides ssp. irriguum | Grossulariaceae
|
| GROX2 | Grossularia oxyacanthoides (L.) P. Mill. | Ribes oxyacanthoides ssp. oxyacanthoides | Grossulariaceae
|
| GRPA2 | Grossularia parishii (Heller) Coville & Britt. | Ribes divaricatum var. parishii | Grossulariaceae
|
| GRQU | Grossularia quercetora (Greene) Coville & Britt. | Ribes quercetorum | Grossulariaceae
|
| GRRE2 | Grossularia reclinata (L.) P. Mill. | Ribes uva-crispa var. sativum | Grossulariaceae
|
| GRRO3 | Grossularia roezlii (Regel) Coville & Britt. | Ribes roezlii var. roezlii | Grossulariaceae
|
| GRRO4 | Grossularia rotundifolia (Michx.) Coville & Britt. | Ribes rotundifolium | Grossulariaceae
|
| GRSE5 | Grossularia senilis Coville | Ribes menziesii var. senile | Grossulariaceae
|
| GRSE6 | Grossularia sericea (Eastw.) Coville & Britt. | Ribes sericeum | Grossulariaceae
|
| GRSE7 | Grossularia setosa (Lindl.) Coville & Britt. | Ribes oxyacanthoides ssp. setosum | Grossulariaceae
|
| GRSP2 | Grossularia speciosa (Pursh) Coville & Britt. | Ribes speciosum | Grossulariaceae
|
| GRTE2 | Grossularia texensis Coville & Berger | Ribes curvatum | Grossulariaceae
|
| GRTU | Grossularia tularensis Coville | Ribes tularense | Grossulariaceae
|
| GRVE | Grossularia velutina (Greene) Coville & Britt. | Ribes velutinum var. velutinum | Grossulariaceae
|
| GRVI3 | Grossularia victoris (Greene) Coville & Britt. | Ribes victoris | Grossulariaceae
|
| GRWA | Grossularia watsoniana (Koehne) Coville & Britt. | Ribes watsonianum | Grossulariaceae
|
| GRMU | Groutiella mucronifolia sensu Crum & Steere | Groutiella tumidula | Orthotrichaceae
|
| GRTO3 | Groutiella tomentosa (Hornsch.) Wijk & Marg. | tomentose groutiella moss | Orthotrichaceae
|
| GRTU3 | Groutiella tumidula (Mitt.) Vitt | groutiella moss | Orthotrichaceae
|
| GROUT | Groutiella Steere in Crum & Steere | groutiella moss | Orthotrichaceae
|
| GUAN | Guajacum angustifolium Engelm. | Texas lignum-vitae | Zygophyllaceae
|
| GUOF | Guajacum officinale L. | lignum-vitae | Zygophyllaceae
|
| GUSA | Guajacum sanctum L. | holywood | Zygophyllaceae
|
| GUAJA | Guajacum L. | lignum-vitae | Zygophyllaceae
|
| GUBR | Guapira bracei (Britt.) Little | Guapira discolor | Nyctaginaceae
|
| GUDI | Guapira discolor (Spreng.) Little | beeftree | Nyctaginaceae
|
| GUFL | Guapira floridana (Britt. ex Small) Lund | Pisonia floridana | Nyctaginaceae
|
| GUFR | Guapira fragrans (Dum.-Cours.) Little | black mampoo | Nyctaginaceae
|
| GUGL2 | Guapira globosa (Small) Little | roundleaf blolly | Nyctaginaceae
|
| GULO2 | Guapira longifolia (Heimerl) Little | Guapira discolor | Nyctaginaceae
|
| GUOB | Guapira obtusata (Jacq.) Little | corcho prieto | Nyctaginaceae
|
| GUAPI | Guapira Aubl. | guapira | Nyctaginaceae
|
| GUPL | Guardiola platyphylla Gray | Apache plant | Asteraceae
|
| GUARD | Guardiola Cerv. ex Humb. & Bonpl. | guardiola | Asteraceae
|
| GUGL3 | Guarea glabra Vahl | alligatorwood | Meliaceae
|
| GUGU2 | Guarea guara (Jacq.) P. Wilson | Guarea guidonia | Meliaceae
|
| GUGU | Guarea guidonia (L.) Sleumer | American muskwood | Meliaceae
|
| GURA | Guarea ramiflora Vent. | Guarea glabra | Meliaceae
|
| GUTR3 | Guarea trichilioides L. | Guarea guidonia | Meliaceae
|
| GUARE | Guarea Allam. ex L. | guarea | Meliaceae
|
| GUBL | Guatteria blainii (Griseb.) Urban | haya minga | Annonaceae
|
| GUCA2 | Guatteria caribaea Urban | haya blanca | Annonaceae
|
| GUATT | Guatteria Ruiz & Pav�n | guatteria | Annonaceae
|
| GUGU3 | Guazuma guazuma (L.) Cockerell | Guazuma ulmifolia | Sterculiaceae
|
| GUUL | Guazuma ulmifolia Lam. | bastardcedar | Sterculiaceae
|
| GUAZU | Guazuma P. Mill. | guazuma | Sterculiaceae
|
| GUEL | Guettarda elliptica Sw. | hammock velvetseed | Rubiaceae
|
| GUKR | Guettarda krugii Urban | frogwood | Rubiaceae
|
| GULA2 | Guettarda laevis Urban | Guettarda valenzuelana | Rubiaceae
|
| GUOD | Guettarda odorata (Jacq.) Lam. | cucubano de vieques | Rubiaceae
|
| GUOV | Guettarda ovalifolia Urban | cucubano | Rubiaceae
|
| GUPA2 | Guettarda parviflora Vahl | Guettarda odorata | Rubiaceae
|
| GUPU | Guettarda pungens Urban | roseta | Rubiaceae
|
| GUSC | Guettarda scabra (L.) Vent. | wild guave | Rubiaceae
|
| GUVA | Guettarda valenzuelana A. Rich. | cucubano de monte | Rubiaceae
|
| GUETT | Guettarda L. | guettarda | Rubiaceae
|
| GUBO | Guilandina bonduc L. | Caesalpinia bonduc | Fabaceae
|
| GUCR | Guilandina crista auct. non (L.) Small | Caesalpinia bonduc | Fabaceae
|
| GUDI2 | Guilandina divergens (Urban) Britt. | Caesalpinia divergens | Fabaceae
|
| GUME | Guilandina melanosperma Eggers | Caesalpinia ciliata | Fabaceae
|
| GUOV2 | Guilandina ovalifolia (Urban) Britt. | Caesalpinia major | Fabaceae
|
| GUPO | Guilandina portoricensis Britt. & Wilson | Caesalpinia portoricensis | Fabaceae
|
| GUGA | Guilielma gasipaes (Kunth) L. H. Bailey | Bactris gasipaes | Arecaceae
|
| GUSP2 | Guilielma speciosa C. Martius | Bactris gasipaes | Arecaceae
|
| GUDEA | Guilleminea densa (Humb. & Bonpl. ex Willd.) Moq. var. aggregata Uline & Bray | small matweed | Amaranthaceae
|
| GUDED | Guilleminea densa (Humb. & Bonpl. ex Willd.) Moq. var. densa | small matweed | Amaranthaceae
|
| GUDE | Guilleminea densa (Humb. & Bonpl. ex Willd.) Moq. | small matweed | Amaranthaceae
|
| GULAR | Guilleminea lanuginosa (Poir.) Hook. f. var. rigidiflora (Hook.) Mears | Gossypianthus lanuginosus var. lanuginosus | Amaranthaceae
|
| GULAS | Guilleminea lanuginosa (Poir.) Hook. f. var. sheldonii (Uline & Bray) Mears | Gossypianthus lanuginosus var. lanuginosus | Amaranthaceae
|
| GULAT | Guilleminea lanuginosa (Poir.) Hook. f. var. tenuiflora (Hook.) Mears | Gossypianthus lanuginosus var. tenuiflorus | Amaranthaceae
|
| GULA | Guilleminea lanuginosa (Poir.) Hook. f. | Gossypianthus lanuginosus var. lanuginosus | Amaranthaceae
|
| GUILL | Guilleminea Kunth | matweed | Amaranthaceae
|
| GUFL3 | Guillenia flavescens (Hook.) Greene | yellow mustard | Brassicaceae
|
| GULA4 | Guillenia lasiophylla (Hook. & Arn.) Greene | California mustard | Brassicaceae
|
| GULE2 | Guillenia lemmonii (S. Wats.) R. Buck | Lemmon's mustard | Brassicaceae
|
| GUILL2 | Guillenia Greene | mustard | Brassicaceae
|
| GUAB | Guizotia abyssinica (L. f.) Cass. | ramtilla | Asteraceae
|
| GUIZO | Guizotia Cass. | guizotia | Asteraceae
|
| GUTO | Gundelia tournefortii L. | Tournefort's gundelia | Asteraceae
|
| GUNDE | Gundelia L. | gundelia | Asteraceae
|
| GUCO | Gundlachia corymbosa (Urban) Britt. ex Boldingh | yambush | Asteraceae
|
| GUNDL | Gundlachia Gray | gundlachia | Asteraceae
|
| GUCH | Gunnera chilensis Lam. | Gunnera tinctoria | Gunneraceae
|
| GUEA | Gunnera eastwoodae St. John | Gunnera petaloidea | Gunneraceae
|
| GUIN | Gunnera insignis Oerst. | poorman's umbrella | Gunneraceae
|