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| Dactylaena | pauciflora | 
| Dactylis | glomerata | 
| Dactyloctenium | aegyptium | 
| Dahlia | pinnata | 
| Dahlstedtia | burkartii, floribunda, lewisiana, muehlbergiana, pentaphylla | 
| Dalbergia | brasiliensis, ecastaphyllum, ernest-ulei, foliolosa, frutescens  var. tomentosa, frutescens  var. frutescens, lateriflora, miscolobium, nigra | 
| Dalea | azurea, boliviana, cylindrica  var. nova, elegans  var. elegans, elegans  var. onobrychioides, leporina, moquehuana, pennellii  var. chilensis | 
| Dalechampia | anomala, bangii, clausseniana, ficifolia, glechomifolia, guaranitica, hassleriana, leandrii, linearis, meridionalis, micromeria, pentaphylla, reitzkleinii, riparia, scandens, serrula, stenosepala, stipulacea, sylvestris, triphylla, weddelliana | 
| Danaea | moritziana, nodosa | 
| Danthonia | annableae, araucana, californica  var. americana, chilensis  var. aureofulva, chilensis  var. chilensis, chilensis  var. glabriflora, cirrata, decumbens, malacantha, melanathera, montevidensis, rhizomata, rugoloana, secundiflora  ssp. charruana, secundiflora  ssp. mattheii, secundiflora  ssp. secundiflora | 
| Daphnopsis | brasiliensis, coriacea, fasciculata, pseudosalix, racemosa, sellowiana | 
| Darcya | vandellioides | 
| Dasyanthina | palustris | 
| Dasycondylus | debeauxii, dusenii, resinosus | 
| Dasyphyllum | armatum, brasiliense  var. brasiliense, brasiliense  var. divaricatum, donianum, flagellare, floribundum, inerme, lanceolatum, maria-lianae, spinescens, sprengelianum, tomentosum  var. tomentosum, tomentosum  var. multiflorum, vagans, varians | 
| Datura | ferox, inoxia, stramonium | 
| Daucus | carota, montanus, pusillus | 
| Davilla | elliptica, grandiflora, rugosa | 
| Dayia | glutinosa | 
| Declieuxia | cordigera  var. angustifolia, dusenii, fruticosa, lysimachioides | 
| Deianira | nervosa | 
| Delairea | aparadensis, odorata | 
| Delilia | biflora | 
| Delphinium | ajacis | 
| Delpinophytum | patagonicum | 
| Dendropanax | australis, cuneatus, monogynus | 
| Dendrophorbium | bomanii, brachycodon, bradei, catharinense, fruticosus, limosum, paranense, peregrinum, pluricephalum, subnemorale | 
| Denisophytum | stuckertii | 
| Denmoza | rhodacantha | 
| Dennstaedtia | cicutaria, cornuta, dissecta, glauca | 
| Deparia | petersenii | 
| Deppea | blumenaviensis | 
| Deschampsia | airiformis, antarctica, berteroana, caespitosa  var. caespitosa, caespitosa  var. pulchra, chrysantha  var. phalaroides, chrysantha  var. chrysantha, chrysostachya, cordillerarum, danthonioides, elongata, eminens  var. fulva, eminens  var. discreta, eminens  var. eminens, eminens  var. inclusa, gayana  var. neuquenensis, gayana  var. gayana, hackelii, kingii, laxa, looseriana  var. triandra, looseriana  var. looseriana, mendocina, micrantha, monandra, parvula, patula, setacea, venustula | 
| Descurainia | antarctica, canoensis, depressa, erodiifolia, myriophylla, nuttallii, pimpinellifolia, sophia, stricta | 
| Desfontainia | spinosa | 
| Desmanthus | acuminatus, brevipes, hexapetalus, paspalaceus, pernambucanus, tatuhyensis  var. tatuhyensis, virgatus | 
| Desmaria | mutabilis | 
| Desmodium | affine, album, arechavaletae, bridgesii, burkartii, cajanifolium, craspediferum, cuneatum, distortum, glabrum, guaraniticum, hassleri, incanum, intermedium, leiocarpum, membranifolium, microcarpum, pachyrrhizum, polygaloides, procumbens, riedelii, subsecundum, subsericeum, tortuosum, triarticulatum, uncinatum, venosum | 
| Desmoscelis | villosa | 
| Deuterocohnia | abstrusa, brevifolia, chrysantha, digitata, haumanii, meziana  ssp. vallegrandensis, meziana  ssp. vogtii, recurvipetala, schreiteri, strobilifera | 
| Deyeuxia | diemii, pooides, suka | 
| Dianthus | armeria, deltoides | 
| Diastatea | micrantha | 
| Diatenopteryx | sorbifolia | 
| Dicella | bracteosa, nucifera | 
| Dichaea | anchorifera, brevicaulis, bryophila, calyculata, cogniauxiana, pendula, trulla | 
| Dichanthelium | hebotes, sabulorum  var. cordatum, sabulorum  var. polycladum, sabulorum  var. sabulorum, sciurotoides, stigmosum, superatum, surrectum | 
| Dichanthium | annulatum, aristatum | 
| Dichelachne | micrantha | 
| Dichondra | argentea, macrocalyx, micrantha, microcalyx, sericea  var. sericea, sericea  var. tomentosa, sericea  var. holosericea | 
| Dichorisandra | hexandra, incurva, paranaensis, pubescens, thyrsiflora | 
| Dicksonia | berteroana, externa, sellowiana | 
| Dicliptera | cabrerae, cochabambensis, jujuyensis, paposana, scutellata, squarrosa | 
| Dicranopteris | discolor, flexuosa, nervosa | 
| Dictyophragmus | punensis | 
| Dictyostega | orobanchoides  ssp. parviflora, orobanchoides  ssp. orobanchoides | 
| Didymochlaena | truncatula | 
| Didymoglossum | angustifrons, hymenoides, krausii, ovale, punctatum, pusillum, reptans | 
| Didymopanax | angustissimus, calvus, morototoni, vinosus | 
| Dieffenbachia | aglaonematifolia | 
| Digitalis | purpurea | 
| Digitaria | aequiglumis  var. aequiglumis, aequiglumis  var. laetevirens, balansae, bicornis, californica  var. californica, californica  var. villosissima, catamarcensis, chacoensis, ciliaris, connivens  var. connivens, connivens  var. pilosa, corynotricha, cuyabensis, enodis, eriantha, eriostachya, fiebrigii, filiformis, fuscescens, horizontalis, insularis, ischaemum, laxa, lehmanniana  var. dasyantha, leiantha, longiflora, myriostachya, nuda, paraguayensis, phaeothrix  var. hackelii, phaeothrix  var. adusta, phaeothrix  var. phaeotrix, phaeothrix  var. saltensis, purpurea, queenslandica, sacchariflora, sanguinalis, sellowii, setigera, similis, singularis, swalleniana, ternata, violascens | 
| Dilodendron | bipinnatum | 
| Dimerostemma | annuum, apense, arnottii, aspilioides, grisebachii, hieronymi, indutum, myrtifolium, pseudosilphioides, reitzii, tenuifolium | 
| Dimorphandra | mollis | 
| Dinebra | panicea  ssp. brachiata, scabra | 
| Dinemandra | ericoides, gayana | 
| Dinoseris | salicifolia | 
| Dioclea | burkartii, virgata | 
| Diodia | kuntzei, saponariifolia | 
| Dioscorea | acanthogene, acerifolia, alata, altissima, amaranthoides, andina, antucoana, araucana, aristolochiifolia, aspera, auriculata, axilliflora, ayardei, beecheyi, bermejensis, besseriana  var. berteroi, besseriana  var. besseriana, biloba  ssp. biloba, biloba  ssp. coquimbana, brachybotrya  var. germainii, brachybotrya  var. brachybotrya, brachystachya, bryoniifolia, bulbifera, bulbotricha, calcarea, campestris, castilloniana, ceratandra, chondrocarpa, cienegensis, cinnamomifolia, cissophylla, commutata, coronata, curitybensis, delicata, demourae, dodecaneura, entomophila, fastigiata, flexuosa, fractiflexa, furcata, gayi, glandulosa, glomerulata, gracilis, grandiflora, grisebachii, hassleriana, haumanii, heterophylla  var. longifolia, heterophylla  var. heterophylla, hieronymi, humifusa  var. humifusa, humilis  ssp. humilis, humilis  ssp. polyanthes, laxiflora, litoralis, longipes, macrantha, marginata, martiana, megalantha, microbotrya, microcephala, modesta, monadelpha, monandra, multiflora, multispicata, nana, nitida, obtusifolia  var. philippii, obtusifolia  var. obtusifolia, olfersiana, oligophylla, ovata, pallidinervia, parviflora, paupera, pedicellata, pencana, pilcomayensis, piperifolia, polygonoides, reticulata, rumicoides, saxatilis, scabra, sellowiana, sinuata, spectabilis, stegelmanniana, stenopetala, subhastata, tenella, tenuis, toldosensis, trifurcata, trisecta, tubuliflora, uliginosa, valdiviensis, variifolia, volckmannii | 
| Diospyros | hassleri, inconstans  ssp. obovata, lasiocalyx | 
| Diostea | juncea | 
| Diphasiastrum | falcatum, thyoides | 
| Diphasium | gayanum, jussiaei | 
| Diplachne | fusca  ssp. fascicularis, fusca  ssp. uninervia, fusca  ssp. muelleri, fusca  ssp. fusca | 
| Diplazium | ambiguum, asplenioides, brachycarpum, celtidifolium, cristatum, divergens, fuenzalidae, herbaceum, hians, leptocarpon, lilloi, lindbergii, mattogrossense, moccennianum, mutilum, plantaginifolium, riedelianum, rostratum, striatastrum, striatum, tabalosense, tamandarei, turgidum, urticifolium | 
| Diplokeleba | floribunda | 
| Diplolepis | australis, biflora, boerhaviifolia, bulligera, descolei, diemii, geminiflora, hieronymi, menziesii, mucronata, myrtifolia, nummulariifolia, pachyphylla, viridis | 
| Diploon | cuspidatum | 
| Diplopterys | lutea, pubipetala | 
| Diplostephium | cinereum, meyenii, paposanum, tacorense | 
| Diplotaxis | erucoides, muralis, tenuifolia | 
| Dipogon | lignosus | 
| Diposis | bulbocastanum, patagonica, saniculifolia | 
| Dipsacus | fullonum, sativus | 
| Dipteryx | alata | 
| Diptychandra | aurantiaca | 
| Dipyrena | glaberrima | 
| Dirhamphis | balansae | 
| Disakisperma | dubium | 
| Discaria | americana, articulata, chacaye | 
| Disciphania | contraversa, ernstii  var. glaziovii | 
| Discocactus | hartmannii | 
| Discolobium | junceum, psoraleifolium, pulchellum | 
| Distichia | filamentosa, muscoides | 
| Distichlis | acerosa, australis, humilis, laxiflora, scoparia  var. erinacea, scoparia  var. scoparia, spicata  var. spicata, spicata  var. stricta | 
| Distimake | aegyptius, cissoides, digitatus, dissectus  var. dissectus, hasslerianus, macrocalyx, maragniensis, tenondensis, tomentosus | 
| Disynaphia | calyculata, ericoides, filifolia, ligulifolia, littoralis, multicrenulata, radula, senecioneoidea, spathulata, tacuarembensis, variolata | 
| Ditassa | burchellii, edmundoi, hispida, obcordata, racemosa, tomentosa | 
| Dittrichia | graveolens, viscosa | 
| Dodonaea | viscosa | 
| Dolichandra | chodatii, cynanchoides, dentata, hispida, quadrivalvis, uncata, unguiculata, unguis-cati | 
| Dolichlasium | lagascae | 
| Dolichopsis | ligulata, paraguariensis | 
| Doliocarpus | dentatus, glomeratus, schottianus | 
| Domeykoa | andina, oppositifolia, perennis | 
| Donatia | fascicularis | 
| Doniophyton | anomalum, weddellii | 
| Doodia | paschalis | 
| Dorstenia | brasiliensis, carautae, cayapia, hirta, tenuis, urceolata, vitifolia | 
| Doryopteris | acutiloba, adornata, angustata, arifolia, collina, concolor, lorentzii, nobilis, pentagona, rediviva, rivalis, sagittifolia, stierii, triphylla, varians, x scalaris | 
| Downingia | pusilla | 
| Draba | burkartiana, funiculosa, gilliesii, lapaziana, loayzana, macleanii, magellanica, pusilla, thlaspiformis, tucumanensis, verna | 
| Dracontium | margaretae | 
| Drapetes | muscosa | 
| Drimys | andina, angustifolia, brasiliensis  ssp. brasiliensis, brasiliensis  ssp. sylvatica, confertifolia, winteri  var. winteri, winteri  var. chilensis | 
| Drosera | brevifolia, capillaris, communis, grantsaui, latifolia, montana, rotundifolia, uniflora, viridis | 
| Dryadella | aviceps, catharinensis, lilliputana, wuerstlei, zebrina | 
| Dryades | gaudichaudiana | 
| Drymaria | cordata, engleriana  var. devia, glandulosa, ovata, paposana, villosa | 
| Dryopteris | dilatata, filix-mas, patula, wallichiana | 
| Duchesnea | indica  f. albocaput | 
| Duguetia | furfuracea, lanceolata, phaeoclados | 
| Dunalia | brachyacantha, spinosa | 
| Duranta | erecta  var. erecta, erecta  var. grandiflora, serratifolia, vestita | 
| Duseniella | patagonica | 
| Dyckia | affinis, agudensis, alba, apiunensis, bracteata, brevifolia, choristaminea, commixta, delicata, distachya, dusenii, encholirioides, exserta, ferox, floribunda, fosteriana  var. robustior, fosteriana  var. fosteriana, frigida, gracilis, hatschbachii, hebdingii, ibiramensis, insignis, irmgardiae, leptostachya, longipetala, magnifica, maritima, microcalyx  var. microcalyx, microcalyx  var. ostenii, minarum, mitis, monticola, niederleinii, nigrospinulata, pampeana, pontesii, pseudodelicata, ragonesei, reitzii, remotiflora  var. montevidensis, remotiflora  var. tandilensis, remotiflora  var. remotiflora, retardata, retroflexa, rigida, selloa, strehliana, subinermis, tobatiensis, tomentella, tomentosa, tuberosa, tweediei, velascana, velloziifolia, vestita, vicentensis, vilsonii, virgata, walteriana, x elisabethae, x julianae, x racinae | 
| Dyschoriste | axillaris, humilis, hygrophiloides, lavandulacea, maranhonis, paraguariensis, sagittata, smithii, trichanthera, tweediana, venturii | 
| Dysopsis | chilensis, glechomoides, hirsuta | 
| Dysphania | ambrosioides, atriplicifolia, bonariensis, burkartii, carinata, chilensis, mandonii, microcarpa, multifida, oblanceolata, pumilio, retusa, venturii | 
| Dyssochroma | longipes, viridiflorum | 
| Dyssodia | papposa | 
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