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| scientific name | common name(s) | image gallery |
| Hibiscus moscheutos | Crimsoneyed rosemallow Crimson-eyed rose-mallow Marshmallow hibiscus | |
| Houstonia caerulea | Azure bluet Quaker-ladies Bluets | |
| Hydrangea arborescens | Wild hydrangea Sevenbark | |
| Hypericum densiflorum | Bushy St. Johnswort | |
| Hylotelephium telephioides | Allegheny stonecrop | |
| Hydrophyllum virginianum | Eastern waterleaf Shawnee salad Virginia waterleaf | |
| Ilex glabra | Inkberry Gallberry | |
| Ilex laevigata | Smooth winterberry | |
| Ilex opaca | American holly Christmas holly | |
| Ilex verticillata | Common winterberry Michigan holly Black alder | |
| Impatiens capensis | Jewelweed Orange Jewelweed Spotted Touch-Me-Not | |
| Ionactis linariifolius | Flaxleaf whitetop aster Stiff Aster Flaxleaf aster | |
| Iris prismatica | Coastal iris Slender blue flag Slender blue iris | |
| Iris versicolor | Harlequin blueflag Northern blue flag | |
| Iris virginica | Virginia iris Great Blue Flag | |
| Itea virginica | Virginia sweetspire Tassel-white | |
| Iva frutescens | High-tide bush High-water shrub Jesuit's bark Marsh elder | |
| Jeffersonia diphylla | Twinleaf | |
| Justicia americana | American water-willow Water-willow | |
| Juncus canadensis | Canadian rush Canada rush | |
| Juncus effusus | Common rush Soft Rush | |
| Juglans nigra | Black walnut Eastern black walnut | |
| Juncus roemerianus | Black needlerush Needlegrass rush | |
| Juniperus virginiana | Eastern red cedar Eastern redcedar Virginia juniper | |
| Kalmia angustifolia | Sheep laurel Lambkill kalmia Lambkill | |
| Kalmia latifolia | Mountain laurel Calico bush Kalmia | |
| Kosteletzkya virginica | Virginia saltmarsh mallow Virginia fen-rose Seashore mallow Salt Marsh-mallow | |
| Lespedeza capitata | Roundhead lespedeza Roundhead bush-clover | |
| Leersia oryzoides | Rice cut grass Rice cutgrass | |
| Lindera benzoin | Northern spicebush Spicebush | |
| Limonium carolinianum | Carolina sealavender Sea lavender | |
| Lilium canadense | Canada lily Canadian lily Wild yellow lily | |
| Lilium philadelphicum | Wood lily | |
| Liatris pilosa var. pilosa | Shaggy blazing star Grass-leaf blazingstar | |
| Liatris scariosa | Devil's bite Large blazing star Savanna blazing star | |
| Liatris spicata | Dense blazing star Dense gayfeather Marsh blazing star | |
| Liatris squarrosa | Blazing star Scaly blazing star Scaly gayfeather | |
| Liquidambar styraciflua | Sweetgum American sweetgum | |
| Lilium superbum | Turk's-cap lily | |
| Liriodendron tulipifera | Tulip tree Tulip poplar Yellow poplar | |
| Lobelia cardinalis | Cardinal flower | |
| Lonicera sempervirens | Coral honeysuckle Trumpet honeysuckle Woodbine | |
| Lobelia siphilitica | Great blue lobelia | |
| Lupinus perennis | Sundial lupine Wild lupine | |
| Lyonia ligustrina | Maleberry He-huckleberry | |
| Lyonia mariana | Piedmont staggerbush Staggerbush | |
| Magnolia acuminata | Cucumbertree Cucumber tree Mountain magnolia | |
| Maianthemum canadense | Canada mayflower False lily-of-the-valley | |
| Malus coronaria | Sweet crabapple American crab | |
| Maianthemum racemosum ssp. racemosum | Feathery false lily of the valley False spikenard False Solomon's seal Solomon's plume Smilacina | |
| scientific name | common name(s) | image gallery |