INDEX 



277 



Page 



Silene, noctiflora 33, 46, 176 



stellata 29 



Silique 132 



Silphium laciniatum 78 



Silver Weed 73, 186 



Silvery 



Cinquefoil 40 



Nightshade 72 



Silybum marianum 78 



Distribution f . 79 



Simple fruit 132 



Simpson Weed 28, 31 



Sisymbrium 



allissimum 56, 72, 183, f. 183 



officinale 72, f. 183 



Germination 42 



Sium cicutaefolium 72 



Skeleton Weed 251 



Skunkweed 214 



Sleepy 



Catchfly 175 



Grass 64 



Slender 



Knot weed 71 



Nettle 72. 115, 161, f. 161 



Rush 159, f. 159 



Smartweed 166-167, f. 167 



Small 



Barley 68 



Carrot 207 



Mallow 24, 201 



Nettle 162 



Pepper Grass 180, f. 181 



Ragweed 13, f. 17, 26, 58, 59, 62, 73 



Rush Grass 149 



Small-flowered 



Crowfoot 177-178 



Marsh Elder 233-234 



Smartweed f. 22, 24, 28, 31, 32, 



58, 62, 64, 73, 80, 132 



Eradication 98, 100 



Muhlenberg's 5, 165 



Pennsylvania ... 13, 58, 166, f. 167 



Rose-flowered 52 



Slender 166-167, f. 167 



Smith.J. G 50 



Smooth 



Crab Grass 31, 33, 46, 62, 69. 



139-140, f. 140 



Dock 43, 53, 67, 69, 115 



Tobacco 74 



Smothering to destroy weeds 91 



Smut 



Foxtail 103 



Quack Grass 103 



Stink Grass 103 



Snakeroot, White 64 



Sneezeweed 53, 64, 73, 241-242 



Narrow-leaved. .53, 59, 73, 77, 242 



Snow as seed-carrier 15, 16-17 



Snow-on-the-Mountain 196 



Snyder, D. C 27 



Soap-berry Family 198-199 



Soapwort 128, 176 



Sodium arsenate as herbicide . . .97-99 



arsenite 99, 108 



chlorid 96-97 



Page 



Sodium, nitrate 95 



Soils, Depletion of 3-4 



SOLANACEAE 137, 220-222 



Solanunt 



carolinense 54, 71, 83, 85, f. 221, 222 



Legislation 43 



eleagnifolium 72, 222 



nigrum 72, 220, f . 220 



rostratum 54, 68, 78 



triflorum 72 



Solidago 



canadensis 11, 52, 70, 231 



rigida 52 



serotina 58 



Sommerville 95 



Sonchus 



arvensis 79, 252-253 



asper 253 



oleraceus 78, 79, f. 252, 253 



Sorghum 64, 139 



Legislation 48 



halapense 139 



Sorrel 67 



Sheep 24, 28, 31, 33, 36, 



46, 53, 58, 73, 86 



Yellow 18 



Sour Dock 12, 41, 67. 100, f. 163 



South American weeds 78, 80, 81, 84 



South Dakota Weeds 68-75 



Southern 



Morning glory 58 



Nut grass 72, 157-158 



Poverty grass 51 



Spear grass 151 



Sow thistle 24, 57, 58, 60, 65, 73, 



78, 79, 252-253 



Annual 79, f. 252, 253 



Field 252-253 



Perennial 67, 73 



Spiny-leaved 253 



Spadix 125 



Spanish 



Bayonet 18 



Bur 202 



Dagger 13 



Needle] 11, f. 21, 73 



Spear grass 73 



Annual 61 



Southern 151 



Specularia perfoliata 229 



Speedwell 7, 58, 73, 115, 225 



Spike 125, f. 125 



Spiked Dropseed 70 



Spillman, W. J 105 



Spinach 167 



Spines 4 



Spiny 



Amaranth 80, 171 



Clotbur 74 



Cocklebur 59 



Pigweed 58 



Spiny-leaved Sow Thistle 253 



Sporobolus 



neglectus 149 



vaginiflorus 148-149 



