(emu bush) Eremurus Erica (heath/heather) Erigeron (fleabane) Erinacea Erinus Eriobotrya Eriogonum Eriophorum (cotton grass) Eriophyllum Eriostemon (waxflower) Eritrichium Erodium Eryngium (eryngo, sea holly) Erysimum (wallflower) Erythrina (coral tree) Erythronium Escallonia Eschscholzia (California poppy) Escobaria Espostoa Etlingera Eucalyptus (gum tree, ironbark) Eucharis Eucomis Eucommia Eucryphia Eulophia (an orchid genus) Euonymus Eupatorium Euphorbia (spurge) Euptelea Eurya Euryale ferox Euryops Eustoma Evolvulus Exacum Exochorda F Fabiana Fagus (beech) Fallopia Farfugium Fargesia Fascicularia × Fatshedera (hybrid genus) Fatsia Faucaria Felicia (blue daisy) Fendlera Fenestraria Ferocactus Ferraria Ferula (giant fennel) Festuca (fescue) Fibigia Ficus (fig) Ficus pumila Filipendula Firmiana Fittonia Fitzroya Fockea Foeniculum (fennel) Fontanesia Forsythia Fortunella (kumquat) Fothergilla Fouquieria Fragaria (strawberry) Frailea Francoa Frangipani Franklinia Fraxinus (ash) Freesia Fremontodendron Fritillaria (fritillary) Fuchsia Furcraea G Gagea Gaillardia Galanthus (snowdrop) Galax Galega Galium (bedstraw) Galtonia Gardenia Garrya Gasteria Gaultheria Gaura Gaylussacia (huckleberry) Gazania Geissorhiza Gelsemium Genista Gentiana (gentian) Gentianopsis Geranium (cranesbill, not same as Pelargonium) Gerbera Gesneria Geum (avens) Gevuina Gibbaeum Gilia Gillenia Ginkgo Gladiolus Glaucidium Glaucium Gleditsia (honey locust) Globba Globularia (globe daisy) Gloriosa Glottiphyllum Gloxinia Glyceria Glycyrrhiza Gomphocarpus Gomphrena Goniolimon Goodyera (jewel orchid) Gordonia Graptopetalum Graptophyllum Graptoveria (hybrid genus) Grevillea Grewia Greyia Grindelia Griselinia Gunnera (dinosaur food) Guzmania Gymnocalycium Gymnocarpium Gymnocladus Gynandriris Gynura Gypsophila H Haageocereus Haastia Habenaria (an orchid genus) Haberlea Habranthus Haemanthus (blood lily) Hakea Hakonechloa Halesia (silverbell) Halimiocistus (hybrid genus) Halimium Halimodendron Hamamelis (witch-hazel) Haplopappus Hardenbergia (coral pea) Harrisia Hatiora Haworthia Hebe Hechtia Hedera (ivy) Hedychium Hedyotis (bluets) Hedysarum Hedyscepe (umbrella palm) Helenium (sneezeweed) Helianthemum (rock rose) Helianthus (sunflower) Helichrysum Heliconia Helictotrichon Heliocereus Heliophila Heliopsis (ox eye) Heliotropium (heliotrope) Helleborus (hellebore) Heloniopsis Hemerocallis (daylily) Hemigraphis Hepatica Heptacodium Heracleum Herbertia Hereroa Hermannia Hermodactylus Hesperaloe Hesperantha Hesperis Hesperocallis Heterocentron Heterotheca Heuchera (coral flower) × Heucherella (hybrid genus) Hibbertia Hibiscus (rose of Sharon) Hieracium (hawkweed) Himalayacalamus Hippeastrum (amaryllis) Hippocrepis Hippophae Hohenbergia Hohenbergiopsis Hoheria Holboellia Holcus Holmskioldia Holodiscus Homalocladium (ribbon bush) Homeria Hoodia Hordeum (barley) Horminum Hosta (plantain lily) Hottonia Houttuynia Hovea Hovenia Howea (sentry palm) Hoya (wax flower) Huernia Humulus (hops) Hunnemannia Huntleya an orchid genus Hyacinthella Hyacinthoides Hyacinthus (hyacinth) Hydrangea Hydrastis (goldenseal) Hydrocharis (frogbit) Hydrocleys Hydrocotyle (pennywort) Hygrophila Hylocereus Hylomecon Hymenocallis Hymenosporum Hyophorbe (bottle palm) Hyoscyamus (henbane) Hypericum (St. John's wort, rose of Sharon) Hyphaene (doum palm) Hypocalymma Hypoestes Hypoxis (starflower) Hypsela Hyssopus (hyssop) I Iberis (candytuft) Ibervillea Idesia Ilex (holly) Illicium Impatiens (balsam) Imperata Incarvillea Indigofera Inula Iochroma Ipheion Ipomoea (morning glory) Ipomopsis Iresine Iris Isatis Isoplexis Isopyrum Itea Ixia (corn lily)