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