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| Ianthopappus | corymbosus |
| Ibatia | boliviensis, calchaquina, dummelii, fiebrigii, foetida, friesii, hirta, micrantha, schreiteri, venturii |
| Iberis | amara |
| Ibicella | lutea, parodii |
| Ichnanthus | bambusiflorus, inconstans, leiocarpus, nemoralis, procurrens var. subaequiglume, tarijianus |
| Ichthyothere | integrifolia, mollis |
| Idiothamnus | lilloi, pseudorgyalis |
| Ilex | affinis, argentina, brasiliensis, brevicuspis, chamaedryfolia, dumosa var. dumosa, dumosa var. guaranina, integerrima, microdonta, paraguariensis, paraguariensis var. vestita, pseudobuxus, taubertiana, theezans |
| Impatiens | balsamina, glandulifera, walleriana |
| Imperata | brasiliensis, condensata, contracta, minutiflora, parodii, tenuis |
| Indigofera | asperifolia, bongardiana var. bongardiana, bongardiana var. graminoides, campestris, guaranitica, hirsuta, kurtzii, latifolia, lespedezioides, microcarpa, parodiana, pascuorum, spicata, suffruticosa, truxillensis |
| Inga | affinis, barbata, edulis, edwallii, globularis, heterophylla, laurina, lentiscifolia, marginata, saltensis, sellowiana, sessilis, striata, subnuda ssp. luschnathiana, subnuda ssp. subnuda, uraguensis, vera, virescens, vulpina |
| Inulopsis | scaposa, stenophylla |
| Iochroma | arborescens |
| Ionopsis | utricularioides |
| Ipheion | recurvifolium, setaceum, tweedieanum, uniflorum |
| Ipomoea | abutiloides, acutisepala, aemilii, aequiloba, alba, altoparanaensis, amnicola, aprica, argentea, argentinica, aristolochiifolia, asarifolia, australis, austrobrasiliensis, batatas, blanchetii, bonariensis, cairica, campestris, carnea ssp. fistulosa, cheirophylla, chiliantha, chodatiana, chondrosepala, cordatotriloba var. cordatotriloba, cordillerae, corymbosa, crinicalyx, delphinioides, descolei, dolichopoda, dumetorum, estrellensis, fiebrigii, fimbriosepala, grandifolia, graniticola, granulosa, guaranitica, hederifolia, hieronymi, hirsutissima, homotrichoidea, imperati, indica, indivisa, itapuaensis, jujuyensis, lanuginosa, lilloana, lobata, magna, malpighipila, malvaeoides, marginisepala, maurandioides, megalantha, megapotamica, mirabilis, morongii, mucronifolia, muricata, nil, nitida ssp. nitida, nitida ssp. krapovickasii, oblongifolia, oranensis, padillae, paludicola, paludosa, pampeana, paraguariensis, paranaensis, pes-caprae ssp. pes-caprae, philomega, platensis, plummerae, procumbens, procurrens, pseudocalystegia, pseudomalvaeoides, pubescens, purpurea, quamoclit, ramosissima, rojasii, rubens, rubriflora, saopaulista, schulziana, sericosepala, setifera, setosa, stuckertii, subalata, subrevoluta, subspicata, sulina, syringifolia, tacuaremboensis, theodori, tiliacea, tricolor, triloba, uruguayensis, valenzuelensis, variifolia, vivianae, volcanensis, wrightii |
| Ipomopsis | gossypifera |
| Iresine | diffusa |
| Iris | germanica, orientalis, pseudacorus, unguicularis |
| Irlbachia | alata ssp. angustifolia |
| Isabelia | pulchella, violacea, virginalis, x pabstii |
| Isatis | tinctoria |
| Ischaemum | minus, rugosum |
| Ischnosiphon | ovatus |
| Islaya | caligophila, iquiquensis, islayensis, laui |
| Isochilus | brasiliensis, linearis |
| Isoetes | alcalophila, araucaniana, brasiliensis, candelariensis, chubutiana, ekmanii, escondidensis, fuscomarginata, gardneriana, hieronymi, maxima, mourabaptistae, naipiana, panamensis, pedersenii, quiririensis, ramboi, savatieri, sehnemii, smithii, spannagellii, weberi |
| Isolepis | aucklandica, cernua, nigricans, ranko, varians |
| Isostigma | acaule, cordobense, dissitifolium, herzogii, hoffmannii, molfinianum, peucedanifolium var. crithmifolium, peucedanifolium var. peucedanifolium, peucedanifolium var. speciosum, simplicifolium var. riedelii |
| Ivania | cremnophila, juncalensis |
| Ixora | gardneriana, venulosa |
| Ixorhea | tschudiana |
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