Géneros de organismos asociados: Ianthe [2 taxones], Ibatia [2 taxones], Iberis [34 taxones], Icerya [6 taxones], Ichnanthus [50 taxones], Ichnaspis [1 taxon], Ichnocarpus [20 taxones], Ichthyomethia [2 taxones], Icica [8 taxones], Idesia [4 taxones], Idiocerus [1 taxon], Idioscopus [12 taxones], Idriella [12 taxones], Iguanura [3 taxones], Ilex [509 taxones], Illicium [7 taxones], Illigera [1 taxon], Illosporium [15 taxones], Ilysanthes [1 taxon], Immotthia [2 taxones], Impatiens [254 taxones], Imperata [110 taxones], Incrupila [1 taxon], Indarbela [1 taxon], Indigofera [349 taxones], Inga [537 taxones], Inocarpus [1 taxon], Inocybe [3 taxones], Insertia [1 taxon], Intercalarispora [22 taxones], Inula [279 taxones], Iochroma [3 taxones], Iodina [1 taxon], Iodophanus [3 taxones], Ionomidotis [2 taxones], Ionophragmium [2 taxones], Ionopsis [5 taxones], Ioxylon [1 taxon], Ipecacuanha [1 taxon], Iphigenia [1 taxon], Ipomoea [1067 taxones], Ips [7 taxones], Irene [12 taxones], Irenopsis [174 taxones], Iresine [79 taxones], Iriartea [6 taxones], Iris [203 taxones], Irlbachia [12 taxones], Irpex [1 taxon], Irvingia [1 taxon], Isachne [15 taxones], Isanthera [1 taxon], Isaria [8 taxones], Isariopsis [1 taxon], Isatis [11 taxones], Ischaemum [38 taxones], Ischnapsis [2 taxones], Ischnaspis [2 taxones], Ischnoderma [3 taxones], Ischnoptera [1 taxon], Ischnosiphon [9 taxones], Iseilema [12 taxones], Isertia [10 taxones], Isipinga [3 taxones], Isoachlya [2 taxones], Isoberlinia [1 taxon], Isoglossa [42 taxones], Isoloma [2 taxones], Isonandra [1 taxon], Isopogon [1 taxon], Isopyrum [11 taxones], Isotoma [2 taxones], Isthmiella [5 taxones], Isthmospora [12 taxones], Itea [11 taxones], Iva [1 taxon], Ixeris [2 taxones], Ixia [14 taxones], Ixodia [2 taxones], Ixora [146 taxones]