23Hippuris,79Hoarhound,96Hoarhound, Water,95Hobble-bush,111Hog Peanut,59Holly Family,69Holly, Mountain,69Honewort,82Honey Locust,58Honeysuckle,110Honeysuckle, Bush,110Honeysuckle Family,109Hop,24Hop Clover,60Hop Tree,65Hordeum,4Hornbeam,21Horned Pondweed,2Hornwort,34Hornwort Family,34Horse Balm,95Horse Chestnut,70Horse Mint,96Horse Nettle,100Horse Radish,46Horse Weed,130,131Hound's Tongue,93Houstonia,108Huckleberry,86Hudsonia,74Humulus,24Hyacinth, Wild,14Hybanthus,75Hydrocharitaceae,3Hydrocotyle,80Hydrophyllaceae,93Hydrophyllum,93Hyoscyamus,101Hypericaceae,73Hypericum,73,74Hypoxis,14Hyssop,98Hyssop, Hedge,104Hyssopus,98Ilex,69Illecebraceae,31Ilysanthes,104Impatiens,71Imperatoria,82Indian Cucumber-root,13Indian Currant,110Indian Hemp,90Indian Mustard,44Indian Pipe,84Indian Plantain,122Indian Tobacco,113Indian Turnip,8Indigo, Wild,61Inula,127Ipomoea,92Iridaceae,15Iris,15Iris Family,15Ironweed,122Ironweed, Yellow,128Ironwood,22Isopyrum,39Iva,114Jack Pine,1Jeffersonia,40Jerusalem Artichoke,129Jerusalem Oak,29Jimson Weed,100Joe-Pye Weed,122Jointweed,27Juglandaceae,21Juglans,21Juncaceae,10Juncaginaceae,3Juncus,10Juneberry,55Juniper,1Juniperus,1Kalmia,85Kenilworth Ivy,103Kentucky Coffee-tree,58King-nut Hickory,21Knapweed,121Knawel,31Knotweed,26,27Knotwort Family,31Kochia,28Koeleria,6Krigia,115Kuhnia,122Labiatae,95Labrador Tea,85Lactuca,115,116Ladies' Tresses,16Lady's Slipper,18Lake Cress,45,46Lamb's Quarters,29Lamium,99Laportea,24Lappula,94Lapsana,115Large-toothed Aspen,19Larix,1Larkspur,36Lathyrus,59Lauraceae,41Laurel Family,41Lead Plant,58Leafcup,123Leatherleaf,86Leatherwood,77Lechea,74,75Ledum,85Leek, Wild,13Leersia,5Leguminosae,58Lemna,9Lemnaceae,9Lentibulariaceae,105Leontodon,115Leonurus,98Lepachys,128Lepidium,45,46Lespedeza,61,63Lettuce,115,116Lettuce, Wild,115,116Liatris,121Lilac,88Liliaceae,10Lilium,12Lily,12Lily Family,10Lily of the Valley, Wild,12Lily, Pond,35Lily, Water,35Limnanthaceae,68Limosella,103Linaceae,63Linaria,102,103Linden Family,72Linnaea,109Linum,63Liparis,17Lippia,99Liriodendron,40Listera,17Lithospermum,94Live-for-ever,49Lizard's Tail,19Lobelia,113Lobeliaceae,113Lobelia Family,113Locust,58Locust, Honey,58Lombardy Poplar,19Long-spurred Violet,76Lonicera,110Loosestrife,77,87,88Loosestrife, False,78Loosestrife Family,77Lopseed,107Lopseed Family,107Loranthaceae,25Lotus,35Lousewort,102Love Grass,7Love-in-a-mist,38Low Juniper,1Ludvigia,78Lupine,59Lupinus,59Luzula,10Lychnis,33Lysimachia,87,88Lycium,100Lycopus,95Lythraceae,77Lythrum,77Madder Family,108Mad-dog Skullcap,96Magnoliaceae,40Magnolia Family,40Maianthemum,13Mallow,73Mallow Family,72Mallow, Marsh,72Mallow, Poppy,73Mallow, Rose,72Mallow, Virginia,73Malva,73Malvaceae,72Manna Grass,7Maple,70Maple Family,70Mare's-tail,79Marigold, Bur,124Marigold, Water,123Marrubium,96Marsh Cinquefoil,57Marsh Elder,114Marsh Harebell,112Marsh Mallow,72Marsh Pea,59Marsh Speedwell,105Masterwort,82Matricaria,130Matrimony Vine,100May Apple,40Meadow Beauty,77Meadow Parsnip,81Meadow Pink,34Meadow Rue,39Meadow Salsify,115Meadow-sweet,53Medeola,13Medicago,60,61Melampyrum,104Melastomaceae,77Melastoma Family,77Melilotus,61Menispermaceae,40Menispermum,40Mentha,98Menyanthes,88Mermaid Weed,79Mertensia,93,94Mexican Tea,29Mezereum Family,77Microstylis,17Mignonette Family,48Mignonette, Yellow,48Mikania,121Milfoil, Water,79Milk Thistle,117Milk Vetch,60Milkweed,90,91Milkweed Family,90Milkweed, Green,90Milkwort,66Milkwort Family,65Millet,4Mimulus,102,104Mint,98Mint Family,95Mist Flower,121Mistletoe, Dwarf,25Mistletoe Family,25Mitchella,108Mitella,51Mitrewort, False,51Mocker-nut Hickory,21Mollugo,31Monarda,96Moneses,85Moneywort,87Monkey Flower,104Monkey Flower, Yellow,102Monotropa,84Moonseed,40Moonseed Family,40Morning Glory,92Morning Glory Family,91Morus,24Moss Pink,92Motherwort,98Moth Mullein,101Mountain Alder,22Mountain Ash,52Mountain Holly,69Mountain Maple,70Mountain Mint,98Mouse-ear Chickweed,33Mouse-ear Cress,47Mud Plantain,10Mudwort,103Mugwort,119Muhlenbergia,5,6Mulberry,24Mullein,101Mullein Pink,33Muscari,14Musk Flower,102Mustard,43,44Mustard Family,42Myosotis,94Myrica,20,21Myricaceae,20Myriophyllum,79Naiad,2Naias,2Najadaceae,2Narrow-leaved Cat-tail,2Nelumbo,35Nemopanthus,69Nepeta,98Nettle,24Nettle, Dead,99Nettle Family,23Nettle, Hedge,99Nettle, Hemp,99Nettle, Horse,100Nicandra,101Nicotiana,101Nigella,38Nightshade,100Nightshade, Enchanter's,78Nightshade Family,100Ninebark,53Nipplewort,115Nodding Pogonia,18Norway Pine,1Nut Grass,8Nyctaginaceae,31Nymphaea,35Nymphaeaceae,35Nymphoides,88Nyssa,83Oak,22,23Oakesia,12Oats,6Oenothera,78Oleaceae,88Oleaster Family,77Olive Family,88Onagraceae,78One-flowered Wintergreen,85Onion, Wild,13Onosmodium,93Opuntia,77Orache,29Orchard Grass,6Orchidaceae,15Orchis,17Orchis, Crane-fly,16Orchis Family,15Orchis, Showy,17Ornithogalum,14Orobanchaceae,106Orobanche,106Orpine Family,48Osmorhiza,82Ostrya,22Oswego Tea,96Oxalidaceae,64Oxalis,64Ox-eye,123Ox-eye Daisy,131Oxybaphus,31Oxypolis,81Painted Cup,102Painted Trillium,12Pale Violet,76Panax,80Panic-grass,5Panicum,5Pansy,76Papaveraceae,41Papaver,41Papaw,40Paper Birch,21Parietaria,24Parnassia,50Parsley Family,80Parsley, Hemlock,83Parsnip, Cow,82Parsnip, Meadow,81Parsnip, Prairie,81Parsnip, Water,81Parsnip, Wild,81Partridge Berry,108Partridge Pea,60Pasque Flower,38Pastinaca,81Patience Dock,26Pea,59Peach-leaved Willow,20Pear,54Pear, Prickly,77Pearlwort,32Pearly Everlasting,120Pedicularis,102Pellitory,24Peltandra,9Penny Cress,46Pennyroyal,95Pennywort, Water,80Penthorum,49Pentstemon,104Pepper Family,