INDEX 



191 



Plate Page 



SCROPHULARIACEAE 133 



Scutch 6 34 



Sedge Family 39 



Sedge, Awned 39 



Sedum purpureum 103 



Seeding to Grass 18 



Self-heal 131 



Senecioneae 160 



Senecio Jacobaea 61 160 



viscostis 161 



vulgaris 161 



Setaria glauca 25 



viridis 1 24 



Sheep destroy Weeds 18 



Shepherd's Purse 29 84 



Sherardia arvensis 140 



Sida spinosa Ill 



Sileneae 59 



Silene 69 



antirrhina 69 



Armeria 69 



conica 69 



Cucubalus 22 70 



gaUica 69 



inflata ". 22 70 



latifolia 22 70 



noctiflora 21 68 



prateTisis 20 66 



vulgaris 22 70 



Silkweed 119 



Silkweeds 119 



Silverweed 107 



Sin-apis arvensis 33 92 



Sisymbrium, Tall 35 96 



Sisymbrium altissimum 35 96 



incisum, var. Hartwegianum . . 99 



var. fiiipes 36 98 



officinale 97 



pannonicum 35 96 



sinajristrum 35 96 



Skeleton Weed 177 



Smartweed 11 46 



Smartweeds 40, 41 



Snakeroot, White 143 



Snapdragon, Wild 134 



Sneezeweed 155 



Solidago canadensis 145 



graminifolia 53 144 



lanceolata 53 144 



rugosa 145 



Plate Page 



serotina 145 



Sonchus arvensis 66 170 



asper 173 



oleraceus 67 172 



pulchellus 69 176 



Sophia incisa 36 98 



Sorrel, Field 10 44 



Garden 45 



Red 10 44 



Sheep 10 44 



Sour-grass 10 44 



Speedwells 133 



Spergula arvensis 17 60 



Spider-flower 102 



Spinach Family 50 



Spiny Sida Ill 



Spiraea salicifolia 105 



tomentosa 38 104 



Spurge Family 110 



Spurge, Flowering Ill 



Ridge-seeded Ill 



Sun 110 



Spurrey 17 60 



Com 17 60 



St. James'-wort 61 160 



St. John's- wort Family 112 



St. John's-wort, Common ... 41 112 



Corymbed 113 



Great '. . .. 113 



Pale 113 



Spotted 113 



Stachys palustris 49 132 



Staggerwort, 61 160 



Steeple Bush 38 104 



Stellaria graminea 63 



media 18 62 



Stickseed 46 124 



Stickweed 46 124 



Virginian 125 



Stinking Willie 61 160 



Stinkweed 27 80 



Stitchwort, Grass-leaved 63 



Lesser 63 



Succory, Wild 64 166 



Summer Fallowing 15 



SriNFLOWER Family 141 



Sunflower, Black-headed 154 



False 155 



Prairie, Many-flowered 155 



. Wild 154 



