Index
- Habenaria distans, hammock rein orchid
- Habenaria floribunda, rein orchid
- Habenaria quinqueseta, long-horned rein orchid
- Habenaria repens, water-spider rein orchid
- Habranthus tubispathus, rain lily
- Halesia carolina, little silverbell, Carolina silverbell
- Halesia diptera, twowing silverbells
- Halodule wrightii, shoalgrass
- Hamamelis virginiana, witch-hazel
- Hamelia patens, firebush
- Harperocallis flava, Harper's beauty
- Harrisella porrecta, threadroot orchid, needleroot airplant orchid
- Harrisia aboriginum, aboriginal prickly-apple
- Harrisia fragrans, Caribbean applecactus
- Harrisia simpsonii, Simpson's applecactus
- Hedera helix, English ivy
- Hedychium coronarium, wild ginger, garland flower
- Hedyotis corymbosa, old world diamond-flower
- Hedyotis nigricans, diamond-flowers
- Hedyotis procumbens, innocence
- Helenium amarum, pasture sneezeweed
- Helenium autumnale, fall sneezeweed
- Helenium flexuosum, winged sneezeweed
- Helenium pinnatifidum, southeastern sneezeweed
- Helianthemum arenicola, Gulf rockrose
- Helianthemum carolinianum, sun-rose frostweed, Carolina rock-rose
- Helianthemum corymbosum, pinebarren frostweed, clustered rockrose
- Helianthemum nashii, Florida scrub frostweed
- Helianthus angustifolius, swamp sunflower; narrow-leaved sunflower
- Helianthus annuus, annual sunflower
- Helianthus atrorubens, hairy wood sunflower
- Helianthus debilis, east coast beach sunflower
- Helianthus debilis subsp. cucumerifolius var. tardiflorus, cucumberleaf beach sunflower
- Helianthus debilis subsp. vestitus, hairy beach sunflower, west coast beach sunflower
- Helianthus divaricatus, woodland sunflower
- Helianthus floridanus, Florida sunflower
- Helianthus heterophyllus, wetland sunflower
- Helianthus hirsutus, sunflower
- Helianthus microcephalus, sunflower
- Helianthus radula, rayless sunflower
- Helianthus strumosus, pale-leaf woodland sunflower
- Helianthus tuberosus, Jerusalem artichoke
- Heliotropium angiospermum, scorpion-tail
- Heliotropium curassavicum, seaside heliotrope
- Heliotropium polyphyllum, pineland heliotrope
- Hemarthria altissima, limpograss
- Hemerocallis fulva, day lily
- Herissantia crispa, bladder mallow
- Heteranthera dubia, mud-plantain, yellow waterstar grass
- Heteropogon contortus, tanglehead
- Heteropogon melanocarpus, sweet tanglehead
- Heterotheca subaxillaris, camphorweed
- Hexalectris spicata, crested coralroot
- Hibiscus acetosella, hibiscus
- Hibiscus aculeatus, pineland hibiscus
- Hibiscus coccineus, scarlet hibiscus
- Hibiscus furcellatus, linden-leaf rosemallow
- Hibiscus grandiflorus, swamp rosemallow
- Hibiscus moscheutos, swamp mallow, swamp hibiscus, swamp rosemallow
- Hibiscus poeppigii, Poeppig's rosemallow
- Hibiscus rosa-sinensis, Chinese hibiscus, rose-of-China, Hawiian hibiscus
- Hibiscus trionum, rosemallow
- Hieracium aurantiacum, orange hawkweed
- Hieracium gronovii, hairy hawkweed
- Hieracium megacephalon, large-head hawkweed
- Hippocratea volubilis, medicine-vine
- Hippomane mancinella, manichineel
- Houstonia pusilla, innocence, tiny bluet
- Hydrangea arborescens, wild hydrangea
- Hydrangea quercifolia, oak-leaf hydrangea
- Hydrilla verticillata, hydrilla, waterthyme
- Hydrocotyle bonariensis, large-leaf water penny-wort
- Hydrocotyle ranunculoides, floating penny-wort
- Hydrocotyle umbellata, marsh penny-wort
- Hydrocotyle verticillata, whorled penny-wort
- Hydrolea corymbosa, sky flower
- Hydrolea quadrivalvis, hairy hydrolea
- Hymenachne amplexicaulis, trompetilla
- Hymenocallis latifolia, mangrove spiderlily, perfuned spiderlily
- Hymenocallis palmeri, alligator-lily
- Hymenocallis rotata, spring-run spiderlily
- Hypericum brachyphyllum, coastalplain St. John's-wort
- Hypericum chapmanii, sponge-bark St. John's-wort
- Hypericum cistifolium, roundpod St. John's-wort
- Hypericum crux-andreae, St. John's-wort
- Hypericum cumulicola, Highland's scrub hypericum
- Hypericum edisonianum, Edison's ascrium
- Hypericum fasciculatum, sandweed
- Hypericum frondosum, St. John's-wort
- Hypericum galioides, bedstraw St. John's-wort
- Hypericum gentianoides, orange-grass, pineweed
- Hypericum hypericoides, St. Andrew's-cross
- Hypericum lissophloeus, smoothbark St. John's-wort
- Hypericum microsepalum, small-sepal St. John's-wort
- Hypericum mutilum, dwarf St. John's-wort
- Hypericum myrtifolium, myrtle-leaf St. John's-wort
- Hypericum nudiflorum, early St. John's-wort
- Hypericum prolificum, shrubby St. John's-wort, broombrush
- Hypericum reductum, Atlantic St. John's-wort, matted sandweed
- Hypericum suffruticosum, pineland St. John's-wort
- Hypericum tetrapetalum, four-petal St. Peter's-wort
- Hypolepis repens, flakelet fern
- Hypoxis curtissii, yellow star-grass
- Hypoxis juncea, yellow star-grass, common star-grass
- Hyptis alata, musky bushmint
- Hyptis mutabilis, common bittermint, tropical bushmint
- Hyptis verticillata, John Charles
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