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Helictotrichon
     sempervirens ‘Saphirsprudel’

     sempervirens ‘Sapphire’
Heliotrope Webcap (Cortinarius iodes)
Heliotrope,
     Pineland (Heliotropium polyphyllum)

     Purple (Heliotropium arborescens ‘Fragrant Delight’)
     Wild (Phacelia distans)
     Wild (Phacelia)
     Winter (Tussilago farfara)
Heliotropium
     angiospermum

     arborescens ‘Fragrant Delight’
     horizontale
     leavenworthii
     parviflorum
     polyphyllum
     polyphyllum var. horizontale
Hellebore,
     American (Veratrum viride)

     Corsican (Helleborus argutifolius)
     False (Veratrum viride)
Helleborine, Broad-leaved (Epipactis helleborine)
Helleborus
     argutifolius

     hyemalis
Hell’s Bells (Datura stramonium)
Helonias
     asphodeloides

     bullata
     tenax
Helonias, Glass-leaved (Xerophyllum asphodeloides)
Hembra, Viznaga (Ferocactus wislizeni)
Hemerocallis
Hemerocallis
     fulva

     fulva var. fulva
     fulva var. kwanso
     fulva var. rosea
     ‘Strawberry Candy’
Hemlock Spruce (Tsuga canadensis)
Hemlock,
     Canada (Tsuga canadensis)

     Carolina (Tsuga caroliniana)
     Eastern (Tsuga canadensis)
     Water (Cicuta maculata)
Hemp Dogbane (Apocynum cannabinum)
Hemp, Indian (Apocynum cannabinum)
Hemp-nettle, Common (Galeopsis tetrahit)
Hempvine, Climbing (Mikania scandens)
Hen of the Woods (Grifola frondosa)
Henbit
     (Lamium amplexicaule)

     Deadnettle (Lamium amplexicaule)
Hepatica
     (Hepatica nobilis var. acuta)

     (Hepatica nobilis var. obtusa)
Hepatica
     acuta

     acutiloba
     americana
     hepatica
     nobilis var. acuta
     nobilis var. obtusa
     triloba var. acuta
     triloba var. americana
Hepatica,
     Round-lobed (Hepatica nobilis var. obtusa)

     Sharp-lobed (Hepatica nobilis var. acuta)
Heptacodium
     jasminoides

     miconioides
Heptapleurum arboricolum
Heracleum
     lanatum

     mantegazzianum
     maximum
     sphondylium ssp. montanum
     sphondylium var. lanatum
Herald, Spring (Forestiera pubescens)
Herb
     Barbara (Barbarea vulgaris)

     Paris (Paris quadrifolia)
     Robert (Geranium robertianum)
Herb, Bitter (Chelone glabra)
Herb-Robert (Geranium robertianum)
Herb-bennet, Hairy (Geum laciniatum)
Herba de Maria (Salvia divinorum)
Herbaceous Carrion Flower (Smilax herbacea)
Herbe-à-crâbes (Batis maritima)
Hericium americanum
Hesperidanthus linearifolius
Hesperis matronalis
Hesperocallis undulata
Heuchera
     hispida

     richardsonii
     richardsonii var. affinis
     richardsonii var. grayana
     richardsonii var. hispidior
     ‘Caramel’
     ‘Miracle’
     ‘Stormy Seas’
Hexastylis arifolia var. arifolia
Hibiscus [Genus]
Hibiscus
     (Hibiscus rosa-sinensis ‘Itsy Bitsy Red’)

     (Hibiscus syriacus ‘Blue Satin’)
     (Hibiscus ‘Lord Baltimore’)
     (Hibiscus)
Hibiscus
     acetosella ‘Haight-Ashbury’

     laevis
     militaris
     rosa-sinensis ‘Itsy Bitsy Red’
     syriacus
     syriacus cv.
     syriacus ‘Antong Two’
     syriacus ‘Blue Satin’
     syriacus ‘Lil’
     ‘Lord Baltimore’
Hickey’s Tree Clubmoss (Dendrolycopodium hickeyi)
Hickory,
     Pignut (Carya glabra)

     Shagbark (Carya ovata)
Hicoria
     alba

     austrina
     borealis
     glabra
     glabra var. hirsuta
     ovata
Hieracium [Genus]
Hieracium
     acuminatum

     aurantiacum
     caespitosum
     canadense
     gronovii
     gronovii var. foliosum
     lachenalii
     murorum
     paniculatum
     pilosella
     pratense
     vulgatum
Highbush Blueberry (Vaccinium corymbosum)
Highway Ice Plant (Carpobrotus edulis)
Hilaria rigida
Hill’s Lupine (Lupinus hillii)
Himalayan Rhubarb (Rheum australe)
Hinds’ Nightshade (Solanum hindsianum)
Hispid Buttercup (Ranunculus hispidus)
Hoary
     Alder (Alnus incana ssp. rugosa)

     Alison (Berteroa incana)
     Alyssum (Berteroa incana)
     Asylum (Berteroa incana)
     False Alyssum (Berteroa incana)
     Mountain Mint (Pycnanthemum incanum)
Hobblebush (Viburnum lantanoides)
Hog
     Apple (Podophyllum peltatum)

     Gum (Metopium toxiferum)
Hogpeanut, American (Amphicarpaea bracteata)
Hogweed,
     Giant (Heracleum mantegazzianum)

     Little (Portulaca oleracea)
Holcus lanatus
Hollowleaf Annual Lupine (Lupinus succulentus)
Holly
     (Ilex)

     Fern (Cyrtomium falcatum)
Holly,
     American (Ilex opaca ‘Goldie’)

     Dahoon (Ilex cassine)
     Deciduous (Ilex decidua)
     Desert (Atriplex hymenelytra)
     Desert (Mahonia fremontii)
     English (Ilex aquifolium)
     European (Ilex aquifolium)
     Inkberry (Ilex glabra)
     Mountain (Ilex mucronata)
     Swamp (Ilex mucronata)
     Winterberry (Ilex verticillata ‘Jim Dandy’)
Hollyhock, Black (Alcea rosea ‘Nigra’)
Honckenya peploides
Honesty, Annual (Lunaria annua)
Honey
     Locust (Gleditsia triacanthos)

     Mushroom (Armillaria mellea)
Honey-bells (Cephalanthus occidentalis)
Honey-myrtle, Violet (Melaleuca wilsonii)
Honeycup (Zenobia pulverulenta)
Honeylocust (Gleditsia triacanthos)
Honeylocust, Thornless (Gleditsia triacanthos var. inermis)
Honeysuckle (Aquilegia canadensis)
Honeysuckle,
     Coral (Lonicera sempervirens)

     Fragrant (Lonicera fragrantissima)
     Japanese (Lonicera japonica)
     Mexican (Justicia spicigera)
     Morning (Oenothera simulans)
     Tatarian (Lonicera tatarica)
     Trumpet (Lonicera sempervirens)
     Wild (Aquilegia canadensis)
     Winter (Lonicera fragrantissima)
Hood, Scarlet (Hygrocybe coccinea)
Hooded
     False Morel (Gyromitra infula)

     Rosette Lichen (Physcia adscendens)
     Skullcap (Scutellaria galericulata)
Hooked
     Agrimony (Agrimonia gryposepala)

     Buttercup (Ranunculus recurvatus)
     Crowfoot (Ranunculus recurvatus)
Hooker’s
     Inula (Inula hookeri)

     Onion (Allium acuminatum)
Hooves, Horse (Phellinus igniarius)
Hop
     Clover (Trifolium aureum)

     Trefoil (Trifolium campestre)
Hop, False (Justicia brandegeana)
Hop-hornbeam (Ostrya virginiana)
Hophornbeam (Ostrya virginiana)
Hophornbeam, Eastern (Ostrya virginiana)
Hopniss (Apios americana)
Hops
     (Humulus lupulus)

     (Humulus ‘Nugget’)
Hops,
     Common (Humulus lupulus var. lupuloides)

     Japanese (Humulus japonicus)
Hordeum
     aegiceras

     distichon
     hexastichon
     hexastichum var.
     irregulare
     sativum
     vulgare
     vulgare ssp. hexastichon
     vulgare var. trifurcatum
Horn of Plenty (Craterellus cornucopioides)
Hornbeam, American (Carpinus caroliniana)
Horse
     Chestnut (Aesculus hippocastanum)

     Foot (Tussilago farfara)
     Hooves (Phellinus igniarius)
     Nettle (Solanum carolinense)
Horse-chestnut, Red (Aesculus × carnea ‘Atropunicea’)
Horse-nettle (Solanum carolinense)
Horsefly Weed (Baptisia tinctoria)
Horseflyweed (Baptisia tinctoria)
Horsenettle, Carolina (Solanum carolinense)
Horsetail (Equisetum)
Horsetail,
     Field (Equisetum arvense)

     Marsh (Equisetum palustre)
     Meadow (Equisetum pratense)
     Rough (Equisetum hyemale)
     Swamp (Equisetum fluviatile)
     Water (Equisetum fluviatile)
     Woodland (Equisetum sylvaticum)
Horseweed (Conyza canadensis)
Horseweed,
     Canada (Conyza canadensis)

     Canadian (Conyza canadensis)
Hosta
     sieboldiana ‘Big Daddy’

     sieboldiana ‘Time Tunnel’
     ‘Big Daddy’
     ‘Fire and Ice’
     ‘Hadspen Heron’
     ‘Sum and Substance’
Hottentot Fig (Carpobrotus edulis)
Houstonia
     caerulea

     caerulea var. faxonorum
     purpurea
Houstonia, Large (Houstonia purpurea)
Howe Hedgehog (Echinocereus engelmannii)
Huajillo (Havardia pallens)
Hubricht’s Bluestar (Amsonia hubrichtii)
Huckleberry,
     Black (Gaylussacia baccata)

     Blue (Gaylussacia frondosa)
     Blue (Vaccinium deliciosum)
     Bog (Vaccinium uliginosum)
     Bush (Gaylussacia dumosa)
     California (Vaccinium ovatum)
     Cascade (Vaccinium deliciosum)
     Common (Gaylussacia baccata)
     Dwarf (Gaylussacia dumosa)
     Evergreen (Vaccinium ovatum)
     Velvetleaf (Vaccinium myrtilloides)
Huilia albocaerulescens
Hummingbird
     Bush (Justicia californica)

     Trumpet (Epilobium canum ssp. latifolium)
Humulus
     americanus

     japonicus
     lupulus
     lupulus ssp. americanus
     lupulus var. lupuloides
     scandens
     ‘Nugget’
Huperzia selago
Hyacinth,
     Grape (Muscari neglectum)

     Water (Eichhornia crassipes)
     Wild (Camassia scilloides)
Hyacinthoides
     hispanica

     non-scripta
Hyacinthus orientalis ‘All Stars’
Hybrid Trillium (Trillium × spp.)
Hydrangea
Hydrangea
     (Hydrangea macrophylla cv.)

     (Hydrangea macrophylla)
Hydrangea
     arborescens cv. Annabelle

     arborescens ‘Annabelle’
     arborescens ‘Dardom’
     macrophylla
     macrophylla cv.
     paniculata cv. Grandiflora
     paniculata cv. Kyushu
     paniculata ‘Grandiflora’
     paniculata ‘Kyushu’
     quercifolia
Hydrangea,
     Bigleaf (Hydrangea macrophylla)

     Blue (Hydrangea macrophylla)
     Oakleaf (Hydrangea quercifolia)
     Panicled (Hydrangea paniculata ‘Kyushu’)
     Peegee (Hydrangea paniculata ‘Grandiflora’)
     Smooth (Hydrangea arborescens ‘Dardom’)
     Wild (Hydrangea arborescens ‘Annabelle’)
Hydrocotyle
     rotundifolia

     sibthorpioides
     umbellata
Hydrophyllum [Genus]
Hydrophyllum canadense
Hygrocybe [Genus]
Hygrocybe
     coccinea

     flavescens
     marginata
     sp.
Hygrophorus erubescens
Hylocereus undatus
Hylocomium
     alaskanum

     giganteum
     proliferum
     splendens
     splendens var. alaskanum
     splendens var. gracilius
     splendens var. obtusifolium
Hylotelephium
     spectabile ‘Autumn Joy’

     ‘Autumn Joy’
Hymenoclea salsola var. salsola
Hymenopappus filifolius
Hymenopappus, Fineleaf (Hymenopappus filifolius)
Hymenoxys
     acaulis var. glabra

     herbacea
Hyophorbe lagenicaulis
Hyoseris virginica
Hypericum
     chapmanii

     ellipticum
     gentianoides
     mutilum
     mutilum var. latisepalum
     mutilum var. parviflorum
     perforatum
     punctatum
     subpetiolatum
     virginicum var. fraseri
Hypomyces lactifluorum
Hypopitys
     americana

     fimbriata
     insignata
     lanuginosa
     latisquama
     monotropa
Hypoxis
     decumbens

     hirsuta
Hypsizygus tessulatus
Hyptis
     alata

     alata var. stenophylla
     emoryi
     radiata
Ibidium cernuum
Icacorea paniculata
Ice
     Plant (Carpobrotus edulis)

     Plant (Delosperma ‘Beaufort West’)
Idaho Blue-eyed Grass (Sisyrinchium idahoense)
Ilex
Ilex
     aquifolium

     bronxensis
     cassine
     curtissii
     decidua
     decidua var. curtissii
     fastigiata
     glabra
     mucronata
     opaca ‘Goldie’
     verticillata
     verticillata var. cyclophylla
     verticillata var. fastigiata
     verticillata var. padifolia
     verticillata var. tenuifolia
     verticillata ‘Jim Dandy’
     verticillata ‘Nana’
     verticillata ‘Red Sprite’
     vomitoria
Impala Lily (Adenium obesum)
Impatiens
     biflora

     capensis
     fulva
     noli-tangere ssp. biflora
     nortonii
     pallida
Imperial Bromeliad (Alcantarea imperialis)
Improved Meyer Lemon (Citrus × meyeri)
Incense-cedar Mistletoe (Phoradendron libocedri)
India Lovegrass (Eragrostis pilosa)
Indian
     Apple (Podophyllum peltatum)

     Basket Grass (Xerophyllum tenax)
     Beet (Lupinus perennis)
     Blanket (Gaillardia pulchella)
     Camas (Camassia quamash)
     Celery (Heracleum maximum)
     Cucumber (Medeola virginiana)
     Cucumber-root (Medeola virginiana)
     Cup (Silphium perfoliatum)
     Fig (Opuntia ficus-indica)
     Fig Prickly Pear (Opuntia ficus-indica)
     Grass (Sorghastrum nutans)
     Head Ginger (Costus woodsonii)
     Hemp (Apocynum cannabinum)
     Mulberry (Morinda citrifolia)
     Mustard (Brassica juncea)
     Paintbrush (Castilleja)
     Pink (Spigelia marilandica)