19
Pepper Grass, 46
Peppermint, 98
Perfumed Cherry, 54
Periwinkle, 90
Petalostemum, 60
Petasites, 130
Petunia, 101
Phacelia, 93
Phleum, 4
Phlox, 92
Phragmites, 6
Phryma, 107
Phrymaceae, 107
Physalis, 101
Physocarpus, 53
Physostegia, 99
Phytolacca, 30
Phytolaccaceae, 30
Picea, 1
Pickerel-weed, 10
Pickerel-weed Family, 10
Picris, 115
Pignut Hickory, 21
Pigweed, 30
Pilea, 24
Pimpernel, 87
Pimpernel, False, 104
Pimpernel, Water, 87
Pinaceae, 1
Pin Cherry, 54
Pine, 1
Pine Drops, 84
Pine Family, 1
Pineweed, 74
Pinguicula, 105
Pink, Deptford, 34
Pink Family, 31
Pink, Fire, 33
Pink, Meadow, 34
Pink, Moss, 92
Pink, Mullein, 33
Pink, Rose, 89
Pin Oak, 23
Pinus, 1
Pinweed, 74, 75
Piperaceae, 19
Pipewort, 9
Pipewort Family, 9
Pitcher Plant, 48
Pitcher Plant Family, 48
Plane Tree Family, 51
Plantaginaceae, 107
Plantago, 107
Plantain, 107
Plantain Family, 107
Plantain, Indian, 122
Plantain, Mud, 10
Platanaceae, 51
Platanus, 51
Plum, 54
Poa, 7
Podophyllum, 40
Podostemaceae, 48
Podostemum, 48
Pogonia, 18
Poison Hemlock, 83
Poison Ivy, 69
Poison Sumach, 68
Pokeweed, 30
Pokeweed Family, 30
Polanisia, 47
Polemoniaceae, 92
Polemonium, 92
Polemonium Family, 92
Polygala, 65, 66
Polygalaceae, 65
Polygonatum, 11
Polygonaceae, 25
Polygonum, 26-28
Polymnia, 123
Polytaenia, 81
Pond Lily, 35
Pondweed, 2
Pondweed Family, 2
Pontederia, 10
Pontederiaceae, 10
Poplar, 19
Poppy, 41
Poppy, Celandine, 41
Poppy Family, 41
Poppy Mallow, 73
Populus, 19
Portulaca, 34
Portulacaceae, 34
Potamogeton, 2
Potentilla, 52, 55-57
Prairie Clover, 60
Prairie Dock, 122
Prairie Fringed Orchis, 19
Prairie June-grass, 6
Prairie Parsnip, 81
Prenanthes, 116
Prickly Ash, 65
Prickly Pear, 77
Primrose, 87
Primrose Family, 87
Primula, 87
Primulaceae, 87
Prince's Feather, 27
Prince's Pine, 85
Proserpinaca, 79
Prunella, 97
Prunus, 54
Psedera, 71
Ptelea, 65
Pterospora, 84
Puccoon, 94
Pulse Family, 58
Purple Avens, 57
Purple Coneflower, 131
Purple Fringed Orchis, 19
Purslane, 34
Purslane Family, 34
Purslane, Water, 78
Putty Root, 16
Pyenanthemum, 98
Pyrola, 84, 85
Pyrus, 52, 54, 55
Quack Grass, 6
Quaking Aspen, 19
Quassia Family, 65
Queen of the Prairie, 57
Quercus, 22, 23
Radicula, 43, 45, 46
Radish, 45
Radish, Horse, 46
Radish, Wild, 44, 45
Ragged Fringed Orchis, 19
Ragweed, 114
Ragwort, 127, 128
Ram's Head Lady's Slipper, 18
Ranunculaceae, 35
Ranunculus, 35-38
Raphanus, 44, 45
Raspberry, 53, 54
Rattlebox, 59
Rattlesnake Master, 80
Rattlesnake Plantain, 17
Rattlesnake Root, 116
Red Ash, 88
Redbud, 58
Red Cedar, 1
Red Clover, 61
Red Currant, 50
Red Maple, 70
Red Mulberry, 24
Red Oak, 23
Red Raspberry, 53
Red-root, 71
Red Sorrel, 25
Red-top, 6
Reed, 6
Reed Grass, 5
Rein Orchis, 18
Reseda, 48
Resedaceae, 48
Rhamnaceae, 71
Rhamnus, 71
Rhexia, 77
Rhus, 68, 69
Ribes, 49, 50
River Weed, 48
River Weed Family, 48
Robinia, 58
Rock Cress, 46, 47
Rocket, Sea, 45
Rock-rose Family, 74
Rosa, 52
Rosaceae, 51
Rose, 52
Rose Family, 51
Rose Mallow, 72
Rose Pink, 89
Rosin Weed, 123
Round-leaved Orchis, 17
Round-leaved Violet, 75
Rowan Tree, 52
Rubiaceae, 108
Rubus, 53, 54
Rudbeckia, 128
Rue Anemone, 39
Rue Family, 65
Ruellia, 107
Rumex, 25, 26
Rush, 10
Rush Family, 10
Rush, Twig, 8
Russian Thistle, 28
Rutabaga, 43
Rutaceae, 65
Sabbatia, 89
Sagina, 32
Sagittaria, 3
Salicaceae, 19
Salix, 20
Salmonberry, 54
Salsify, 115
Salsola, 28
Sambucus, 109
Samolus, 87
Sandalwood Family, 24
Sand Bur, 5
Sand Cherry, 54
Sand Rocket, 42, 43
Sand Spurrey, 32
Sand Violet, 76
Sanguinaria, 41
Sanguisorba, 57
Sanicula, 82
Santalaceae, 24
Sapindaceae, 70
Saponaria, 34
Sarracenia, 48
Sarraceniaceae, 48
Sarsaparilla, 80
Sarsaparilla Family, 80
Sassafras, 41
Satureja, 97
Saururus, 19
Saxifraga, 50
Saxifragaceae, 49
Saxifrage, 50
Saxifrage Family, 49
Saxifrage, Golden, 50
Scarlet Oak, 23
Scheuchzeria, 3
Schneck's Oak, 23
Scirpus, 7
Scleranthus, 31
Scorpion Grass, 94
Scrophularia, 103
Scrophulariaceae, 101
Scrub Oak, 23
Scutellaria, 96
Sea Rocket, 45
Sea-side Crowfoot, 36
Sedge, 8
Sedge Family, 7
Sedum, 48, 49
Self-heal, 97
Seneca Snakeroot, 66
Senecio, 127, 128
Senna, Wild, 60
Setaria, 4
Shag-bark Hickory, 21
Sheep-berry, 111
Sheep Laurel, 85
Shepherdia, 77
Shepherd's Purse, 46
Shingle Oak, 22
Shin-leaf, 84, 85
Shooting Star, 87
Showy Lady's Slipper, 18
Showy Orchis, 17
Sicyos, 112
Sida, 72, 73
Silene, 33, 34
Silphium, 122, 123, 127
Silver Maple, 70
Silver Weed, 55
Silvery Cinquefoil, 66
Silybum, 117
Simarubaceae, 65
Sium, 81
Sisymbrium, 43-45, 47
Sisyrinchium, 15
Skullcap, 96
Skunk Cabbage, 8
Skunk Currant, 49
Slender Nettle, 24
Slippery Elm, 24
Slough Grass, 5
Small-flowered Crowfoot, 36
Small-fruited Hickory, 21
Small Snapdragon, 103
Small Solomon's Seal, 11
Smartweed, 27, 28
Smilacina, 14
Smilax, 11
Smooth Alder, 22
Snake Mouth, 18
Snakeroot, Black, 82
Snakeroot, Seneca, 66
Snakeroot, Virginia, 25
Snapdragon, 103
Sneezeweed, 127
Sneeze Weed, 128
Sneezewort, 131
Snowberry, 85, 111
Soapberry Family, 70
Soapwort, 34
Solanaceae, 100
Solanum, 100
Solidago, 125-127
Solomon's Seal, 11
Sorbaria, 57
Sorrel, Red, 25
Sorrel, Green, 25
Sorrel, Wood, 64
Sour Dock, 26
Sour Gum, 83
Southernwood, 119
Sparganiaceae, 2
Spartina, 5
Spear Grass, 7
Spearmint, 98
Spearwort, 36
Speckled Alder, 22
Specularia, 112
Speedwell, 105
Spergula, 32
Spergularia, 32
Spice Bush, 41
Spiderwort, 9
Spiderwort Family, 9
Spikenard, 80
Spike Rush, 7
Spiraea, 53
Spiranthes, 16
Spirodela, 9
Spotted Wintergreen, 85
Spurge, 67, 68
Spurge Family, 66
Spurred Gentian, 89
Spurrey, 32
Spring Avens, 56
Spring Beauty, 34
Spring Vetch, 59
Spruce, 1
Squashberry, 111
Squaw-root, 106
Squaw Weed, 128
Squirrel Corn, 41
Squirrel-tail, 4
Stachys, 99
Staff Tree Family, 69
Staphylea, 69
Staphyleaceae, 69
Star Flower, 87
Star Grass, 14
Star of Bethlehem, 14
Starry Campion, 33
Steironema, 88
Stellaria, 32, 33
Stemless Lady's Slipper, 18
Stickseed, 94
Stinging Nettle, 24
Stitchwort, 32
St. John's-wort, 73, 74
St. John's-wort Family, 73
Stone Clover, 61
Stonecrop, 48
Stonecrop, Ditch, 49
Stork's-bill, 64
Strawberry, 56
Strawberry, Barren, 55
Strawberry Blite, 29
Streptopus, 11
Striped Maple, 70
Strophostyles, 58
Stylophorum, 41
Sugar Maple, 70
Sumach, 68, 69
Summer Grape, 72
Summer Savory, 97
Sundew, 48
Sundew Family, 48
Sundrops, 78
Sunflower, 128-130
Sunflower, Tickseed, 124
Swamp Birch, 22
Swamp Currant, 49
Swamp Dewberry, 53
Swamp Laurel,