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

N