Click on a common name for a photo of the plant, or click on a letter for names beginning with that letter.
| Hawk's-beard, Thunberg's Asiatic |
Youngia thunbergiana |
| Hawkweed |
Hieracium flagellare |
| Hawkweed, Hairy |
Hieracium gronovii |
| Hawkweed, Meadow |
Hieracium caespitosum |
| Hawkweed, Panicled |
Hieracium paniculatum |
| Hawkweed, Rattlesnake |
Hieracium venosum |
| Hawkweed, Rough |
Hieracium scabrum |
| Hazelnut, American |
Corylus americana |
| Hedge-mustard, Hairy-pod |
Sisymbrium officinale |
| Hedge-mustard, Tall |
Sisymbrium altissimum |
| Hedge-nettle, Hispid |
Stachys hispida |
| Hedge-nettle, Marsh |
Stachys pilosa |
| Hellebore, American False |
Veratrum viride |
| Helleborine, Broad-leaved |
Epipactis helleborine |
| Hemlock, Eastern |
Tsuga canadensis |
| Hempweed, Climbing |
Mikania scandens |
| Hepatica, Roundlobed |
Anemone americana |
| Herb Robert |
Geranium robertianum |
| Herb-sophia |
Descurainia sophia |
| Hickory, Bitternut |
Carya cordiformis |
| Hickory, Mockernut |
Carya tomentosa |
| Hog-peanut, American |
Amphicarpaea bracteata var. bracteata |
| Hog-peanut, Hairy American |
Amphicarpaea bracteata var. comosa |
| Holly, American |
Ilex opaca var. opaca |
| Holly, Winterberry |
Ilex verticillata |
| Honesty, Annual |
Lunaria annua |
| Honewort, Canada |
Cryptotaenia canadensis |
| Honey-locust |
Gleditsia triacanthos |
| Honeysuckle, Amur |
Lonicera maackii |
| Honeysuckle, Japanese |
Lonicera japonica |
| Honeysuckle, Trumpet |
Lonicera sempervirens var. sempervirens |
| Hops, Japanese |
Humulus japonicus |
| Horse-balm, Canada |
Collinsonia canadensis |
| Horse-nettle |
Solanum carolinense var. carolinense |
| Horsemint |
Monarda punctata subsp. punctata |
| Horsetail, Field |
Equisetum arvense |
| Horseweed, Canada |
Conyza canadensis |
| Huckleberry, Blue |
Gaylussacia frondosa |
| Huckleberry, Box |
Gaylussacia brachycera |
| Hyssop, Yellow Giant |
Agastache nepetoides |