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| Gaga | marginata |
| Gaillardia | aristata, cabrerae, megapotamica var. radiata, megapotamica var. scabiosoides, megapotamica var. megapotamica, tontalensis |
| Gaimardia | australis |
| Galactia | benthamiana, burkartii, dimorphophylla, dubia, fiebrigiana var. sericophylla, fiebrigiana var. corrrentina, fiebrigiana var. fiebrigiana, glaucescens, glaucophylla, latisiliqua, longifolia, marginalis var. colombiana, striata var. striata, striata var. crassirachis, texana var. texana, texana var. degasperii |
| Galeandra | beyrichii, junceaoides, paraguayensis, stylomisantha, xerophila |
| Galega | officinalis |
| Galenia | pubescens |
| Galeopsis | tetrahit |
| Galianthe | angustifolia, aurelii, bisepala, brasiliensis, canindeyuensis, centranthoides, chodatiana, cymosa, cyperoides, dichasia, elegans, equisetoides, eupatorioides, fastigiata, gertii, guaranitica, hassleriana, hispidula, krausei, latistipula, laxa ssp. laxa, laxa ssp. paraguariensis, linearifolia, longifolia, montesii, palustris, parvula, pseudopeciolata, reitzii, riograndensis, thalictroides, valerianoides, verbenoides |
| Galinsoga | mandonii, parviflora, quadriradiata |
| Galium | antarcticum, aparine, atherodes, bigeminum, comberi, corymbosum, cotinoides, diffusoramosum, diphyllum, divaricatum, equisetoides, ericoides, eriocarpum, flossdorfii, fuegianum, gilliesii ssp. gilliesii, gracilicaule, hatschbachii, hirtum, humile, humilioides, hypocarpium ssp. hypocarpium, inconspicuum, latoramosum, leptum, lilloi, longipedunculatum, magellanicum, masafueranum, megapotamicum, mollugo, muelleri, murale, nigroramosum, noxium ssp. noxium, ostenianum, ovalleanum, palustre, parisiense, philippianum, ramboi, richardianum ssp. richardianum, rubidiflorum, saxatile, sellowianum, smithreitzii, suffruticosum, telanthos, trichocarpum, tricornutum, uruguayense var. uruguayense, uruguayense var. echinulatum, verum, vile, werdermannii |
| Gallardoa | fischeri |
| Gallesia | integrifolia |
| Galphimia | amambayensis, australis, platyphylla |
| Gamocarpha | alpina ssp. gilliesii, alpina ssp. alpina, australis, caespitosa, chubutensis, compacta, falklandica, graminea, macrocephala, multicaulis, raffaellii, scapigera, selliana, ventosa |
| Gamochaeta | affinis, aliena, alpina, ambatensis, americana, andina, antarctica, argentina, axillaris, calviceps, camaquaensis, capitata, chamissonis, depilata, deserticola, diffusa, erecta, erythractis, falcata, filaginea, girardiana, hiemalis, humilis, longipedicellata, neuquensis, nigrevestis, nivalis, oligantha, pensylvanica, peregrina, procumbens, purpurea, ramosa, rizzini, serpyllifolia, simplicicaulis, sphacelata, spiciformis, stachydifolia, subfalcata, valparadisea, villaroelii |
| Garcinia | brasiliensis, gardneriana, guacopary |
| Gardoquia | gilliesii, multiflora |
| Gastoniella | chaerophylla |
| Gastridium | phleoides, ventricosum |
| Gaudinia | fragilis |
| Gaultheria | antarctica, arassatubensis, bradeana, caespitosa, corvensis, erecta, insana, itatiaiae, linifolia, marticorenae, mucronata, myrsinoides, nubigena, phillyreifolia, poeppigii, pumila var. leucocarpa, pumila var. pumila, racemulosa, renjifoana, serrata var. organensis, serrata var. serrata, tenuifolia, ulei |
| Gavilea | araucana, australis, cardioglossa var. cardioglossa, cardioglossa var. tumbesiana, chica, gladysiae, glandulifera, insularis, kingii, litoralis, longibracteata, lutea, odoratissima, platyantha, supralabellata, trullata, venosa, wittei |
| Gaya | albiflora, bordasii, domingensis, gracilipes, kelleri, matutina, meridionalis, parviflora, pilosa, purpurea, tarijensis |
| Gayella | valparadisaea |
| Gaylussacia | amoena, angustifolia, arassatubensis, brasiliensis, caratuvensis, cardenasii, densa, paranaensis, pseudogaultheria, rhododendron |
| Gayophytum | humile, micranthum |
| Gazania | rigens |
| Gelasine | caerulea, elongata, paranaënsis, uruguaiensis ssp. orientalis, uruguaiensis ssp. uruguaiensis |
| Genipa | americana |
| Genista | monspessulana, tinctoria |
| Genlisea | aurea, repens |
| Gentiana | gayi ssp. magellanica, gayi ssp. gayi |
| Gentianella | benedictae, bromifolia, cabrerae, claytonioides, coquimbensis, cosmantha, erythrochrysea, fabrisii, florida, gageoides, gynophora, helianthemoides, hieronymi, imberbis, kurtzii, magellanica, meyeniana, multicaulis, multiflora, myriantha, oranensis, ottonis, parviflora, pseudocrassula, pulla, punensis, riojae, silenoides var. silenoides, silenoides var. striaticalyx, tarapacana, thiosphaera, tubulosa |
| Geoffroea | decorticans, spinosa |
| Geonoma | elegans, gamiova, pohliana ssp. pohliana, pohliana ssp. weddelliana, schottiana |
| Geophila | macropoda, repens |
| Geranium | aequale, albicans, arachnoideum, berteroanum, carolinianum, core-core, dissectum, fallax, glanduligerum, leucanthum, magellanicum, molle, parodii, planum, purpureum, pusillum, robertianum, rupicola, sessiliflorum, skottsbergii, venturianum |
| Gethyum | atropurpureum, cuspidatum |
| Geum | andicola, boliviense, brevicarpellatum, involucratum, lechlerianum, magellanicum, quellyon |
| Gevuina | avellana |
| Gibasis | geniculata |
| Gilia | castellanosii, crassifolia, foetida, laciniata, valdiviensis |
| Gilliesia | dimera, graminea, isopetala, montana |
| Gladiolus | communis, dalenii, tristis |
| Glandularia | andalgalensis, andina, araucana, aristigera, atacamensis, aurantiaca var. aurantiaca, aurantiaca var. glabra, balansae, berteroi, cabrerae, catharinae, cheitmaniana, corymbosa, dissecta, dusenii, flava, guaibensis, guaranitica, gynobasis, hasslerana, hatschbachi, herteri, humifusa, jordanensis, kuntzeana, laciniata, landbeckii, lilloana, lipozygioides, lobata var. glabrata, lobata var. lobata, macrosperma, marrubioides, megapotamica, mendocina, microphylla, multiglandulosa, nana, paraguariensis, parodii, peruviana, phlogiflora, platensis, porrigens, radicata, rectiloba, ribifolia, rupestris, scrobiculata, selloi, sessilifolia, sessilis, stellarioides, subincana, subpetiolata, sulphurea var. sulphurea, sulphurea var. pedunculata, tecticaulis, tenera, thymoides, tomophylla, tweedieana, venturii |
| Glaucium | corniculatum, flavum |
| Glechoma | hederacea |
| Glechon | ciliata, discolor, elliptica, marifolia, thymoides |
| Gleditsia | amorphoides var. amorphoides, amorphoides var. anacantha, triacanthos |
| Gleichenella | pectinata |
| Glinus | radiatus |
| Gloxinia | erinoides, major, perennis |
| Glyceria | fluitans, multiflora, saltensis |
| Glycyrrhiza | astragalina |
| Gnaphalium | polycaulon |
| Gochnatia | cardenasii, curviflora, palosanto |
| Goeppertia | aemula, cylindrica, eichleri, flavescens, joffilyana, longibracteata, monophylla , prolifera, sellowii, zebrina |
| Gomesa | albinoi, barbaceniae, barbata, bifolia, brieniana, ciliata, cogniauxiana, concolor, cornigera, crispa, curta, discifera, divaricata, doniana, duseniana, eleutherosepala, fischeri, flexuosa, florida f. concolor, florida f. florida, foliosa, fuscans, gardneri, glaziovii, gomezoides, gravesiana, handroi, herzogii, hookeri, hydrophila, imperatoris-maximiliani, kleinii, laxiflora, leinigii, lietzei, loefgrenii, longicornu, longipes, macronyx, macropetala, martiana, paranaensoides, pectoralis, praetexta, psyche, pubes, radicans, ramosa, ranifera f. ranifera, ranifera f. albescens, recurva, riograndensis, sarcodes, uniflora, varicosa, venusta, viperina, widgrenii |
| Gomortega | keule |
| Gomphocarpus | fruticosus, physocarpus |
| Gomphrena | arborescens, boliviana, celosioides, celosioides var. hygrophila, cladotrichoides, colosacana var. colosacana, colosacana var. andersonii, discolor, elegans var. elegans, elegans var. mesopotamica, ferruginea, globosa, graminea, guaranitica, haenkeana, holosericea, macrocephala, martiana, mendocina ssp. mendocina, mendocina ssp. australis, meyeniana var. flaccida, meyeniana var. caulescens, meyeniana var. meyeniana, pallida, paraguayensis, paranensis ssp. paranensis, paranensis ssp. paraguariensis, perennis, phaeotricha, platycephala, pohlii var. hasslerii, portulacoides, pulchella, pumila, radiata, regeliana, riparia, schlechtendaliana, sellowiana, tomentosa var. ruiz-lealii, tomentosa var. tomentosa, triceps, umbellata, uruguayensis, vaga, virgata, vitellina |
| Gongora | bufonia, quinquenervis |
| Goniopteris | biformata, burkartii, iguapensis, paranaensis, riograndensis, scabra, tetragona, tristis, vivipara |
| Gonolobus | parviflorus, rostratus |
| Gonopterodendron | bonariense, sarmientoi |
| Goodenia | radicans |
| Gordonia | fruticosa |
| Gorgonidium | bulbostylum, vermicidum |
| Gossypium | barbadense, herbaceum, hirsutum |
| Gouania | latifolia, lupuloides, polygama, ulmifolia |
| Gouinia | brasiliensis, latifolia, paraguayensis var. paraguayensis, paraguayensis var. tortuosa |
| Govenia | utriculata |
| Grahamia | bracteata |
| Grammitis | fluminensis |
| Grandiphyllum | divaricatum, edwallii, hians, pulvinatum, sphegiferum |
| Graphephorum | ambiguum, cernuum, longiglume, mendocinense |
| Graphistylis | argyrotricha, dichroa, oreophila, organensis, serrana |
| Gratiola | peruviana |
| Grausa | acaulis, gayana, lateritia, martini, micrantha, sagittata |
| Grazielia | brevipetiolata, dimorpholepis, gaudichaudiana, intermedia, multifida, nummularia, schultzii, serrata |
| Greeneocharis | circumscissa |
| Greigia | berteroi, landbeckii, pearcei, sphacelata |
| Grindelia | aegialitis, andina, anethifolia var. anethifolia, anethifolia var. eligulata, atlantica, boliviana, brachystephana, buphthalmoides, cabrerae var. alatocarpa, cabrerae var. cabrerae, chacoensis, chiloensis, coronensis, covasii, gaucha, globularifolia, glutinosa, linearifolia, mendocina var. mendocina, mendocina var. radiata, orientalis, patagonica, peregrinensis, prostrata, prunelloides var. discoides, prunelloides var. prunelloides, puberula, pulchella var. discoidea, pulchella var. pulchella, pygmaea, ragonesei, scorzonerifolia, tarapacana, ventanensis |
| Griselinia | carlomunozii, jodinifolia, racemosa, ruscifolia var. itatiaiae, ruscifolia var. ruscifolia, scandens |
| Grobya | amherstiae, fascifera, galeata, guieselii |
| Grona | adscendens, barbata, triflora |
| Guadua | angustifolia, chacoensis, paniculata, paraguayana, tagoara, trinii, variegata |
| Guapira | areolata, hassleriana, hirsuta, nitida, obtusata, opposita |
| Guarea | guidonia, kunthiana, macrophylla ssp. tuberculata, macrophylla ssp. spiciflora, macrophylla ssp. pachycarpa |
| Guatteria | australis |
| Guazuma | ulmifolia var. tomentella, ulmifolia var. ulmifolia |
| Guettarda | pohliana, uruguensis, viburnoides |
| Guibourtia | hymenaeifolia |
| Guilleminea | chacoensis, densa, elongata, fragilis, gracilis, hirsuta |
| Guindilia | cristata, dissecta, trinervis |
| Gunnera | apiculata, berteroi, bracteata, herteri, lobata, magellanica, manicata, masafuerae, peltata, schindleri, tinctoria var. meyerii, tinctoria var. tinctoria, tinctoria var. valdiviensis |
| Gutierrezia | ameghinoi, baccharoides, chubutensis, espinosae, gayana, gilliesii, isernii var. nivea, isernii var. isernii, leucantha, mandonii var. anomala, mandonii var. mandonii, mendocina, neaeana, repens, resinosa, solbrigii, spathulata, taltalensis, tortosae |
| Guynesomia | scoparia |
| Gymnanthemum | amygdalinum |
| Gymnanthes | boticario , discolor, edwalliana, nervosa |
| Gymneia | virgata |
| Gymnocalycium | alboareolatum, alenae, amerhauseri, andreae, angelae, anisitsii, baldianum, bayrianum, bruchii var. bruchii, bruchii var. brigittae, bruchii var. niveum, bueneckeri, cabreraense, calochlorum, campestre, capillense, castellanosii ssp. acorrugatum, castellanosii var. castellanosii, castellanosii var. bozsingianum, denudatum, erinaceum, eurypleurum, fischeri, gibbosum, horstii, hybopleurum, hyptiacanthum, kieslingii f. castaneum, kieslingii f. kieslingii, kieslingii f. alboareolatum, kroenleinii, kuehhasii ssp. corneuspinum, kuehhasii, kuehhasii ssp. incurvatispinum, leptanthum, marianae, marsoneri, mazanense, megatae, mesopotamicum, mihanovichii, monvillei ssp. achirasense, monvillei ssp. monvillei, monvillei ssp. horridispinum, mostii, mucidum, neuhuberi, ochoterenae ssp. ochoterenae, ochoterenae ssp. vatteri, oenanthemum, paediophilum, paraguayense f. fleischerianum, paraguayense f. paraguayense, parvulum, pflanzii ssp. argentinense, ponomarevae, pugionacanthum, quehlianum, ragonesei, raineri, reductum var. platense, reductum var. reductum, ritterianum, robustum, saglionis var. saglionis, saglionis var. jujuyense, sanluisense, schickendantzii var. delaetii, schickendantzii var. schickendantzii, schroederianum ssp. schroederianum, schroederianum ssp. bayense, schroederianum ssp. boessii, schroederianum ssp. paucicostatum, spegazzinii, stellatum, stenopleurum, stuckertii, sutterianum ssp. dolezalii, sutterianum ssp. arachnispinum, taningaense ssp. taningaense, taningaense ssp. fuschilloi, uebelmannianum, uruguayense, volskyi ssp. angulatum, volskyi |
| Gymnocoronis | spilanthoides var. subcordata, spilanthoides var. spilanthoides |
| Gymnophyton | flexuosum, foliosum, isatidicarpum, polycephalum, robustum, spinosissimum |
| Gymnopogon | burchellii, glaber, grandiflorus, legrandii, spicatus, toldensis |
| Gymnosiphon | divaricatus, tenellus |
| Gynerium | sagittatum |
| Gynura | aurantiaca |
| Gypothamnium | pinifolium |
| Gypsophila | vaccaria |
| Gyptidium | militare, trichobasis |
| Gyptis | artemisifolia, commersonii, crassipes, lanigera, tanacetifolia |
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