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| Haageocereus | australis, fascicularis |
| Habenaria | achalensis, alpestris, amambayensis, anisitsii, araneiflora, armata, australis, balansae, bractescens, brasiliensis, campylogyna, crassipes, distans, dusenii, dutraei, edwallii, ekmaniana, exaltata, gourlieana, guentheriana, guilleminii, gustavi-edwallii, habenarioides, hassleriana, hatschbachii, heleogena, henscheniana, hexaptera, imbricata, inconspicua, integripetala, jaguariahyvae, johannensis, josephensis, kleinii, leprieurii, leptoceras, leucosantha, macrodactyla, macronectar, megapotamensis, montevidensis, montiswilhelminae, nemorosa, nuda, obtusa, paivaeana, paranaensis, parviflora, pentadactyla, petalodes, piraquarensis, platanthera, pleiophylla, pumila, regnellii, repens, rodeiensis, rolfeana, rupicola, schenckii, secunda, secundiflora, sobraliana, subfiliformis, subviridis, tamanduensis, trifida, ulei, umbraticola, warmingii |
| Hackelia | revoluta |
| Hackelochloa | granularis |
| Hagenbachia | brasiliensis, hassleriana, matogrossensis |
| Halenia | hieronymi |
| Halerpestes | cymbalaria, exilis, uniflora |
| Halodule | wrightii |
| Halophytum | ameghinoi |
| Haloragis | masafuerana var. masafuerana, masafuerana var. asperrima, masatierrana var. masatierrana, masatierrana var. applanata, masatierrana var. scabrida |
| Halosicyos | ragonesei |
| Hamadryas | argentea, delfinii, kingii, magellanica f. magellanica, magellanica f. paniculata, sempervivoides |
| Hamelia | patens |
| Hancornia | speciosa |
| Handroanthus | abayoy, albus, catarinensis, chrysotrichus, heptaphyllus, impetiginosus, lapacho, ochraceus ssp. ochraceus, ochraceus var. aguaraguensis, pulcherrimus, serratifolius, umbellatus, vellosoi |
| Hapalorchis | lineata, stellaris |
| Haplopappus | angustifolius, anthylloides, baylahuen, bezanilleanus, boelckei, cerberoanus ssp. cerberoanus, cerberoanus ssp. elquianus, chrysanthemifolius, colliguayensis, coquimbensis, decurrens, deserticola, diplopappus ssp. diplopappus, diplopappus ssp. villosus, donianus, foliosus, glutinosus, graveolens, grindelioides, humilis, integerrimus var. integerrimus, integerrimus var. punctatus, ischnos, kingii, latifolius, linifolius, macraeanus, macrocephalus, maulinus, mendocinus, meyenii, mieresii, mucronatus, multifolius, nahuelbutae, neoscaposus, ochagavianus, parvifolius, pedunculosus, philippii, phyllophorus, pinea, pinnatifidus, platylepis, poeppigianus, pristiphyllus, pulchellus, racemiger, reicheanus, remyanus, rengifoanus, rigidus, rosulatus, rotundifolius, saxatilis, schumannii, scrobiculatus, serrulatus, setulosus, stelliger, stolpii, taeda, teillieri, uncinatus, undulatus, velutinus, vicuniensis |
| Haplopteris | ensiformis |
| Haplorhus | peruviana |
| Haplosticha | arnicoides, zosterifolia |
| Haroldia | mendocina |
| Harrisia | bonplandii, martinii, pomanensis ssp. regelii, pomanensis ssp. pomanensis, tortuosa |
| Hatiora | salicornioides |
| Hatschbachiella | polyclada, tweedieana |
| Haukia | crotalophoroides, tuberosa |
| Hebanthe | erianthos, occidentalis var. occidentalis, occidentalis var. bangii, pulverulenta, spicata |
| Hebeclinium | macrophyllum |
| Hecistopteris | pumila |
| Hedeoma | mandonianum, medium, multiflorum, polygalaefolium, teyucuarensis |
| Hedera | helix |
| Hedychium | coronarium |
| Hedyosmum | brasiliense |
| Hedypnois | rhagadioloides |
| Heimia | apetala, montana, salicifolia |
| Heisteria | perianthomega, silvianii |
| Heladena | multiflora |
| Helanthium | bolivianum, tenellum |
| Helenium | argentinum, aromaticum, atacamense, donianum, glaucum, insulare, ovallense, uniflorum, urmenetae var. leguiffei, urmenetae var. urmenetae, vallenariense |
| Helia | angustifolia, brevifolia, oblongifolia |
| Helianthus | × laetiflorus, annuus, petiolaris, tuberosus |
| Helichrysum | foetidum |
| Heliconia | farinosa, hirsuta, psittacorum, subulata ssp. gracilis |
| Helicotropis | hookeri, linearis |
| Helicteres | brevispira, gardneriana, lhotzkyana var. pubinervis, lhotzkyana var. lhotzkyana |
| Helictotrichon | scabrivalve |
| Helietta | apiculata, puberula |
| Heliocarpus | americanus |
| Heliopsis | buphthalmoides |
| Heliotropium | abbreviatum, amplexicaule, angiospermum, chenopodiaceum var. chenopodiaceum, chenopodiaceum var. ericoideum, corymbosum var. grisellum, curassavicum var. curassavicum, curassavicum var. fruticulosum, elongatum, eremogenum, filifolium, floridum, funkiae, geissei, glutinosum, inconspicuum, indicum, jaffuelii, johnstonii, krauseanum, kurtzii, leiocarpum, lilloi, linariifolium, longistylum, megalanthum, microstachyum, myosotifolium, nicotianifolium, paronychioides, patagonicum, philippianum, phylicoides, pinnatisectum, pycnophyllum, ruiz-lealii, schreiteri, sclerocarpum, sinuatum, stenophyllum, taltalense, transalpinum, veronicifolium |
| Helminthotheca | echioides |
| Helogyne | apaloidea, macrogyne, tacaquirensis |
| Helosciadium | nodiflorum |
| Helosis | brasiliensis, cayennensis |
| Hemarthria | altissima |
| Hemidictyum | marginatum |
| Hemionitis | tomentosa |
| Hemipogon | acerosus, setaceus |
| Hennecartia | omphalandra |
| Henriettea | glabra |
| Heracleum | mantegazzianum |
| Herbertia | amabilis, darwinii, furcata, guyunusae, lahue ssp. lahue, lahue ssp. amoena, pulchella, quareimana, tigridioides, zebrina |
| Herbstia | brasiliana |
| Herissantia | crispa, intermedia, nemoralis |
| Herniaria | austroamericana, cinerea, hirsuta |
| Herreria | bonplandii, montevidensis, stellata |
| Hesperis | matronalis |
| Hesperochloa | argentina |
| Hesperozygis | dimidiata, kleinii, nitida, rhododon, ringens, spathulata |
| Heteranthera | catharinensis, limosa, multiflora, pumila, reniformis, zosterifolia |
| Heterocentron | subtriplinervium |
| Heterocondylus | alatus, amphidictyus, decipiens, didymus, grandis, lysimachioides, pumilus, vitalbae |
| Heterophyllaea | pustulata |
| Heteropogon | contortus, melanocarpus |
| Heteropsis | oblongifolia, rigidifolia, salicifolia |
| Heteropterys | aenea, amplexicaulis, argyrophaea, bicolor, byrsonimifolia, chrysophylla, cochleosperma, crenulata, cultriformis, dumetorum, dusenii, eglandulosa, glabra, hypericifolia, intermedia, leschenaultiana, microcarpa, mollis, mulgurae, nervosa, nitida, pauciflora, pteropetala, rhopalifolia, schulziana, sylvatica, syringifolia, tomentosa, umbellata |
| Heterosperma | diversifolium, nanum, ovatifolium, tenuisectum |
| Heterostachys | olivascens, ritteriana |
| Heterotheca | subaxillaris |
| Hevea | brasiliensis |
| Hexasepalum | apiculatum, radulum, teres |
| Hibiscus | acetosella, amambayensis, bifurcatus, diversifolius, furcellatus, hasslerianus, radiatus, sororius, striatus, trionum, urticifolius |
| Hieracium | × stoloniflorum, achalense, adenocephalum, antarcticum, argentinense, astroadenium, aurantiacum, burkartii, catamarcense, chacoense, chilense, cienegae, commersonii, cordobense, criniceps, dasychaetocomum, eriadenium, flagellare, fulvipes, gigantium, gilliesianum, glaucifolium, jaretanum, kieslingii, lorentzianum, luteomontanum, mandonii, mendocinum, microcephalum, mosenii, murorum, neofurcatum, niederleinii, padcayense, palezieuxii, paraguayense, patagonicum, pilosella ssp. euronotum, praealtum, reitzianum, schreiteri, sordidum, stachyoideum, streptochaetum, tandilense, tucumanicum var. esetosum, tucumanicum var. tucumanicum, urvillei, vervoorstii |
| Hieronyma | alchorneoides |
| Hieronymiella | aurea, cachiensis, caletensis, clidanthoides, marginata, speciosa |
| Hieronymusia | alchemilloides |
| Hildaea | nemorosa, pallens var. major, pallens var. pallens, ruprechtii, tenuis |
| Hilleria | latifolia |
| Hillia | illustris, parasitica |
| Hindsia | longiflora, ramosissima |
| Hippeastrum | aglaiae, angustifolium, argentinum, aulicum, blossfeldiae, breviflorum, cybister, escoipense, euryphyllum, glaucescens, laklano, marumbiense, morelianum, multiflorum, papilio, parodii, psittacinum, ramboi, reginae, reticulatum, santacatarina, striatum, verdianum, vittatum |
| Hippobroma | longiflora |
| Hippocratea | volubilis |
| Hippuris | vulgaris |
| Hiraea | cuneata, fagifolia, hatschbachii, macrophylla, reitzii |
| Hirschfeldia | incana |
| Hirtella | burchellii, hebeclada |
| Histiopteris | incisa |
| Hochreutinera | hassleriana |
| Hoehnea | epilobioides, minima, parvula, scutellarioides |
| Hoffmannia | australis, peckii |
| Hoffmannseggia | aphylla, doellii ssp. argentina, doellii ssp. doellii, erecta, eremophila, glauca, minor, prostrata, pumilio, trifoliata, viscosa, yaviensis |
| Hohenbergia | augusta |
| Holcus | lanatus |
| Hollermayera | valdiviana |
| Holmbergia | tweedii |
| Holocalyx | balansae |
| Holocheilus | brasiliensis, fabrisii, hieracioides, illustris, monocephalus, pinnatifidus, schulzii |
| Holosteum | umbellatum |
| Homalocarpus | bowlesioides, dichotomus, digitatus, dissectus, integerrimus, nigripetalus |
| Homalolepis | glabra, praecox, trichilioides |
| Homalopetalum | joinvillense |
| Homolepis | glutinosa, villaricensis |
| Hordeum | brachyatherum, chilense, comosum, cordobense, erectifolium, euclaston, flexuosum, fuegianum, jubatum, lechleri, marinum ssp. gussoneanum, marinum ssp. marinum, murinum ssp. glaucum, murinum ssp. leporinum, murinum ssp. murinum, muticum, parodii, patagonicum ssp. magellanicum, patagonicum ssp. santacrucense, patagonicum ssp. setifolium, patagonicum ssp. mustersii, patagonicum ssp. patagonicum, procerum, pubiflorum ssp. halophilum, pubiflorum ssp. pubiflorum, pusillum, stenostachys, tetraploideum, vulgare var. trifurcatum, vulgare var. vulgare |
| Hornungia | procumbens |
| Houlletia | brocklehurstiana |
| Hovenia | dulcis |
| Hualania | colletioides |
| Huarpea | andina |
| Huberia | insignis, semiserrata |
| Huidobria | chilensis |
| Humulus | lupulus, scandens |
| Huntleya | meleagris |
| Huperzia | catharinae, fuegiana, saururoides |
| Hyalis | argentea var. argentea, argentea var. latisquama, argentea var. macrosperma, lancifolia |
| Hyaloseris | andrade-limae, camataquiensis, cinerea var. cinerea, cinerea var. tomentella, rubicunda |
| Hybanthus | melchiorianus, nanus |
| Hydnocarpus | pentandrus |
| Hydrangea | serratifolia |
| Hydrochorea | pedicellaris |
| Hydrocleys | martii, mattogrossensis, modesta, nymphoides |
| Hydrocotyle | alpestris, alpina, bonariensis, bowlesioides, callicephala, chamaemorus, cryptocarpa, exigua, filipes, fluminensis, indecora, langsdorffii, leucocephala, modesta, poeppigii, pusilla, ranunculoides, umbellata, verticillata |
| Hydrolea | elatior, palustris, spinosa var. paraguayensis, spinosa var. spinosa |
| Hygrophila | costata |
| Hymenachne | amplexicaulis, bresolinii, condensata, donacifolia, grumosa, leptachne, pernambucensis |
| Hymenaea | courbaril, martiana, stigonocarpa var. stigonocarpa, stigonocarpa var. pubescens |
| Hymenasplenium | laetum, triquetrum |
| Hymenophyllum | asperulum, asplenioides, caespitosum, capurroi, caudatum, caudiculatum, cordobense, crispum, cruentum, cuneatum var. rariforme, cuneatum var. cuneatum, darwinii, delicatulum, dentatum, dicranotrichum, elegans, falklandicum, ferrugineum ssp. ferrugineum, ferrugineum ssp. berteroi, fragile, fuciforme, fucoides, glaziovii, hirsutum, krauseanum, magellanicum, microcarpum, nahuelhuapiense, pectinatum, peltatum, plicatum, plumosum, polyanthos, pulchellum, quetrihuense, rufum, rugosum, secundum, tortuosum, trichophyllum, umbratile, undulatum, venustum, vestitum |
| Hymenostephium | debile |
| Hymenoxys | anthemoides, cabrerae, megapotamica, robusta |
| Hyparrhenia | bracteata, hirta, rufa |
| Hypenia | glauca, macrantha, reticulata |
| Hyperbaena | domingensis, hassleri, oblongifolia |
| Hypericum | androsaemum, austrobrasiliense, bordignonii, brasiliense, brevistylum, caespitosum, caprifoliatum, carinatum, cavernicola, connatum, cordiforme, denudatum, gentianoides, humifusum, legrandii, lorentzianum, microlicioides, mutilum, myrianthum ssp. myrianthum, pedersenii, perforatum, piriai, polyanthemum, rigidum, robsonii, salvadorense, silenoides, tamariscinum, teretiusculum, ternum |
| Hypochaeris | × dolosa, acaulis, alba, albiflora, apargioides, arenaria, argentina, caespitosa, catharinensis, chillensis, chondrilloides, clarionoides, echegarayi, elata, eremophila, eriolaena, gayana, glabra, grisebachii, hookeri, incana var. incana, laciniata, lutea, megapotamica, meyeniana, microcephala, nahuelvutae, neopinnatifida, palustris, pampasica, parodii, patagonica, petiolaris, radicata, scorzonerae var. scorzonerae, spathulata, taraxacoides, tenuifolia, tropicalis, variegata |
| Hypoestes | phyllostachya |
| Hypolepis | acantha, hostilis, mitis, poeppigii, repens, rigescens var. rigescens, rigescens var. paranaensis, rugosula ssp. pradoana, rugosula ssp. poeppigiana, stolonifera var. stolonifera, stolonifera var. nebularis, stolonifera var. delasotae |
| Hypolytrum | schraderianum |
| Hypoxis | atlantica, catamarcensis, decumbens, humilis |
| Hypseocharis | pimpinellifolia, tridentata |
| Hyptis | alata ssp. rugosula, angulosa, australis, balansae, brevipes, caespitosa, campestris, comaroides, dumetorum, hassleri, hirsuta, homalophylla, inodora, lacustris, lagenaria, lanceolata, lappacea, lappulacea, lavandulacea, lorentziana, lutescens, marrubioides, meridionalis, microphylla, muelleri, multibracteata, pachyarthra, pulchella, radicans, recurvata, tetracephala, tetragona, tweedii, uliginosa, villosa |
| Hysterionica | aberrans var. aberrans, aberrans var. hunzikeri, bakeri, cabrerae, chamomilloides, dianthifolia var. pulvinata, dianthifolia var. dianthifolia, glaucifolia, jasionoides, matzenbacherii, nebularis, pinnatiloba, pinnatisecta, pulchella, resinosa |
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