Hamamelis 
Hamelia 
Haploesthes 
Haplophyton 
Harbouria 
Harpaecarphus 
Harpagonella 
Hartmannia 
Hartwrightia 
Hastingsia 
Hazardia 
Hecastocleis 
Hechtia 
Hedeoma 
Hedera 
Hediomoides 
Hedysarum 
Heimia 
Heleastrum 
Heleniastrum 
Helenium 
Heleochloa 
Helianthella 
Helianthemum 
Helianthus 
Helietta 
Heliopsis 
Heliotropium 
Helleborus 
Helonias 
Hemerocallis 
Hemicarpha 
Hemieva 
Hemitomes 
Hemizonia 
Hemizonella 
Hepatica 
Heracleum 
Hermannia 
Hermidium 
Herpestis 
Hesperalcea 
Hesperaloe 
Hesperalaea 
Hesperevax 
Hesperis 
Hesperocallis 
Hesperochiron 
Hesperocnide 
Hesperogenia 
Heteranthera 
Heterocodon 
Heterodraba 
Heterogaura 
Heteromeles 
Heteropogon 
Heterospermum 
Heterotheca 
Heuchera 
Hexalectris 
Hibiscus 
Hicoria 
Hieracium 
Hierochloe 
Hilaria 
Hippocratea 
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Hippomane 
Hippurus 
Hoftmanseggia 
Hofmeisteria 
Holacantha 
Holcus 
Hollisteria 
Holocarpha 
Holodiscus 
Holosteum 
Holozonia 
Homalobus 
Hookera 
Homalocenchrus 
Hordeum 
Horkelia 
Horsfordia 
Hosackia 
Hottonia 
Houstonia 
Houttuynia 
Howellia 
Hudsonia 
Hulsea 
Humulus 
Hutchinsia 
Hydastylus 
Hydrangea 
Hydrastis 
Hydrochloa 
Hydrocotyle 
Hydrolea 
Hydrophyllum 
Hygrophila 
Hymenatherum 
Hymenocallis 
Hymenoclea 
Hymenopappus 
Hymenothryx 
Hyoscyamus 
Hypelate 
Hypericum 
Hypochaeris 
Hypopitys 
Hypoxis 
Hyptis 
Hyssopus 
H ystrix 
Ibervillea 
[cacora 
Ichthyomethia 
Ilex 
llicioides 
Ilicium 
llysanthes 
Impatiens 
Imperatoria 
Imperata 
Indigotera 
Ingenhouzia 
Inula 
lodanthus 
lonactis 
lonidium 
Ipomoea 
‘Lactuca 
Iresine 
Iris 
Isanthus 
Isnardia 
lsocarpha 
Isocoma 
Isoetes 
Isomeris 
Isopappus 
Isopyrum 
Itea 
Iva 
Ivesia 
Ixophorus 
Jacobinia 
Jacquemontia 
Jacquinia 
Jamesia 
Janusia 
Jasione 
Jatropha 
Jaumea 
Jeffersonia 
Jepsonia 
Juglans 
Juncoides 
Juncus 
Juniperus 
Jussiaea 
Justicia 
Kalmia 
Kallstroemia 
Karwinskia 
Keerlia 
Kelloggia 
Kelseya 
Kickxia 
Knautia 
Kneifha 
Kobresia 
Kochia 
Koeberlinia 
Koeleria 
Koellia 
Koeniga 
Koenig 
Korycarpus 
Kosteletzkya 
Krameria 
Kraunhia 
Krigia 
Krynitzkia 
Kuhnia 
Kuhnistera 
Kunzia 
Kyllinga 
Lachnanthes 
Lachnocaulon 
Lachnostoma 
Lacinaria 
Lagenaria 
Lagerstroemia 
