Hackberry
Hairy Beardtongue
Hairy Bittercress
Hairy Brome
Hairy Buttercup
Hairy Cat's Ear
Hairy Crabgrass
Hairy False Goldenaster
Hairy Forked Nailwort
Hairy Mountain Mint
Hairy Pagoda-Plant
Hairy Sweet Cicely
Hairy Vetch
Hairy Wildrye
Hairy Wood Mint
Hairy Wood Sedge
Hairy-Leaved Sedge
Hairy-Seed Beadgrass
Hairyseed Paspalum
Halberd-Leaved Rose Mallow
Harbinger-of-Spring
Hard-Stemmed Bulrush
Harvestlice
Harvestlice Agrimony
Hat, Bishop's
Hawksbeard, Narrow-Leaved
Hawksbeard, Tall False
Hawkweed, Yellow
Hawthorn, Dotted
Hawthorn, Frosted
Hawthorn, Washington
Hazelnut, American
Heal-All
Heart-Leaved Aster
Heartleaf Foamflower
Heartleaf Hedgenettle
Heartleaf Skullcap
Hedge Bindweed
Hedge-Hyssop, Clammy
Hedgenettle, Heartleaf
Hedgenettle, Smooth
Heliotrope
Hellebores
Hemlock, Eastern
Hemlock, Poison
Hemlock, Spotted Water
Hemlock, Water
Hemp Dogbane
Hemp, Indian
Henbit
Hens and Chicks
Hepatica
Hepatica, Sharp-lobed
Hibiscus, Chinese
Hibiscus, Common
Hickory, Bitternut
Hickory, Kingnut
Hickory, Laney's
Hickory, Pignut
Hickory, Shagbark
Hickory, Shellbark
Hickory, Sweet Pignut
Highbush Cranberry
Hoary Bittercress
Hoary Ticktrefoil
Hog Peanut
Hollow Joe-Pye Weed
Holly, American
Holly, Foster
Hollyhock
Honewort
Honeylocust
Honeysuckle, Amur
Honeysuckle, Bush
Honeysuckle, Coral
Honeysuckle, Japanese
Honeysuckle, Northern Bush
Honeyvine
Hooked Crowfoot
Hop Hornbeam
Hophornbeam Copperleaf
Horehound, American Water
Hornbeam Mercury
Hornbeam, American
Hornbeam, Hop
Hornbean Copperleaf
Horse Chestnut
Horsebalm
Horsemint
Horsemint, Common
Horsenettle
Horsenettle, Carolina
Horsetail, Field
Horsetail, Rough
Horsetail, Scouringrush
Horseweed
Horseweed, Canadian
Houstonia, Large
Hubricht's Bluestar
Hyacinth
Hyacinth Bean
Hyacinth, Common Grape
Hyacinth, Dutch
Hyacinth, Garden
Hyacinth, Water
Hyacinth, Wild
Hybrid Cattail
Hydgrangea, Wild
Hydrangea, Annabelle
Hydrangea, Oakleaf
Hydrangea, Smooth
Hyssop, Anise
Hyssop, Blue Giant
Hyssop, Catnip Giant
Hyssop, Fragrant Giant
Hyssop, Lavender
Hyssop, Purple Giant
Hyssop, Yellow Giant