| Family |
Taxon |
Common Name | Photographs |
| Asteraceae |
Hieracium scabrum Michx. |
rough hawkweed, sticky hawkweed |
|
| Hippuridaceae |
Hippuris vulgaris L. |
common mare's tail, mare's tail |
|
| Poaceae |
Hordeum jubatum L. |
foxtail barley, squirrel-tail grass |
|
| Poaceae |
Hordeum pusillum Nutt. |
little barley |
|
| Poaceae |
Hordeum vulgare L. |
common barley |
|
| Rubiaceae |
Houstonia caerulea L. |
azure bluets, bluets, innocence, Quaker-ladies |
|
| Cannabaceae |
Humulus japonicus Siebold & Zucc. |
Japanese hop |
|
| Cannabaceae |
Humulus lupulus L. |
common hop, hop |
|
| Cannabaceae |
Humulus lupulus L. var. lupuloides E.Small |
common hop, hop |
|
| Lycopodiaceae |
Huperzia lucidula (Michx.) Trevis. |
shining club-moss, shining fir-moss |
|
| Ranunculaceae |
Hydrastis canadensis L. |
goldenseal |
|
| Hydrophyllaceae |
Hydrophyllum appendiculatum Michx. |
great waterleaf |
|
| Hydrophyllaceae |
Hydrophyllum virginianum L. |
John's-cabbage, Shawnee-salad, Virginia waterleaf |
|
| Hypericaceae |
Hypericum majus (A.Gray) Britton |
larger Canadian St. John's-wort |
|
| Hypericaceae |
Hypericum perforatum L. |
common St. John's-wort, Klamath-weed, St. John's-wort |
|
| Hypericaceae |
Hypericum punctatum Lam. |
spotted St. John's-wort |
|
| Liliaceae |
Hypoxis hirsuta (L.) Coville |
common gold-star, common star-grass, yellow star-grass |
|
| Lamiaceae |
Hyssopus officinalis L. |
hyssop |
|
| Aquifoliaceae |
Ilex verticillata (L.) A.Gray |
common winterberry |
|
| Balsaminaceae |
Impatiens balfourii Hook.f. |
Balfour's touch-me-not |
|
| Balsaminaceae |
Impatiens balsamina L. |
balsam, spotted snap-weed |
|
| Balsaminaceae |
Impatiens capensis Meerb. |
orange jewelweed, orange touch-me-not, spotted touch-me-not |
|
| Balsaminaceae |
Impatiens pallida Nutt. |
pale touch-me-not, yellow jewelweed, yellow touch-me-not |
|
| Asteraceae |
Inula helenium L. |
elecampane |
|
| Convolvulaceae |
Ipomoea purpurea (L.) Roth |
common morning-glory, tall morning-glory |
|
| Iridaceae |
Iris virginica L. var. shrevei (Small) E.S.Anderson |
blue flag, Shreve's iris, southern blue flag, Virginia iris |
|
| Asteraceae |
Iva xanthifolia Nutt. |
bur-weed marsh-elder, giant sump-weed |
|
| Juglandaceae |
Juglans cinerea L. |
butternut, white walnut |
|
| Juncaceae |
Juncus acuminatus Michx. |
sharp-fruited rush, taper-tip rush, tufted rush |
|
| Juncaceae |
Juncus arcticus Willd. var. balticus (Willd.) Trautv. |
Arctic rush, Baltic rush, wire rush |
|
| Juncaceae |
Juncus bufonius L. |
toad rush |
|
| Juncaceae |
Juncus canadensis J.Gay |
Canadian rush |
|
| Juncaceae |
Juncus dudleyi Wiegand |
Dudley's rush |
|
| Juncaceae |
Juncus greenei Oakes & Tuck. |
Greene's rush |
|
| Juncaceae |
Juncus nodosus L. |
joint rush, jointed rush, knotted rush |
|
| Juncaceae |
Juncus tenuis Willd. |
path rush, poverty rush, roadside rush |
|
| Juncaceae |
Juncus torreyi Coville |
Torrey's rush |
|
| Cupressaceae |
Juniperus virginiana L. var. virginiana |
eastern red-cedar |
|
| Araliaceae |
Kalopanax septemlobus (Thunb. ex A.Murray) Koidz. |
castor aralia |
|
| Dipsacaceae |
Knautia arvensis (L.) Coult. |
blue-buttons, field scabiosa |
|
| Chenopodiaceae |
Kochia scoparia (L.) Schrad. subsp. scoparia |
burning bush, common kockia, Mexican fireweed, summer-cypress |
|
| Poaceae |
Koeleria macrantha (Ledeb.) Schult. |
June grass, prairie June grass |
|
| Asteraceae |
Krigia biflora (Walter) S.F.Blake |
false-dandelion, orange dwarf-dandelion |
|
| Asteraceae |
Krigia biflora (Walter) S.F.Blake subsp. biflora |
false-dandelion, orange dwarf-dandelion |
|
| Asteraceae |
Krigia biflora (Walter) S.F.Blake subsp. glandulifera (Fernald) H.H.Iltis |
false-dandelion, orange dwarf-dandelion |
|
| Asteraceae |
Krigia virginica (L.) Willd. |
Virginia dwarf-dandelion |
|
| Asteraceae |
Kuhnia eupatorioides L. var. corymbulosa Torr. & A.Gray |
false boneset |
|
| Asteraceae |
Lactuca biennis (Moench) Fernald |
tall blue lettuce, woodland lettuce |
|
| Asteraceae |
Lactuca canadensis L. |
Canada lettuce, tall lettuce, tall wild lettuce, wild lettuce |
|
| Asteraceae |
Lactuca ludoviciana (Nutt.) Riddell |
prairie lettuce, prairie wild lettuce, western wild lettuce |
|