456 INDEX. 



Page. 



Slender nettle 305 



Slender rush 304 



Small alyssura ". 343 



Small bindweed 390 



Small crab-grass 295 



Small-flowered agrimony 357 



Small-flowered crane's bill 370 



Small-flowered mallow 380 



Small-fruited false flax 347 



Smart-weed 307 



Smooth-brome grass 292 



Soapwart 333 



Soft agrimony 357 



Soft chess 292 



Solanaceae 402 



Solanum 402, 405 



Solidago 438 



Sonchus .- 439, 440, 441 



Sorrel 310, 311 



Sorrel family 369 



Sour dock 310 



Sow thistle 439, 440, 441 



Spanish dodder 393 



Spear grass 306 



Speedwell 407, 408 



Spergula 337 



Spike, an infloresence of sessile or nearly sessile flowers on a single elongated axis. 

 Spikelet, a small or secondary spike as found in grasses. 



Spiny clotbur 445 



Spotted cowbane 385 



Spotted spurge 374 



Spraying to kill weeds 285 



Spreading orache 316 



Spurge 372, 373, 374, 375, 376 



Spurge family 371 



Spurred rye 288 



Spurry 337 



Squirrel-tail grass 298 



Staggerwort 437 



Star thistle 421 



Stellaria 337 



Sterile, not fertile. 



Stick-seed 394 



Stick-tight 419, 420, 421 



Stink grass 291 



Stink weed 355 



Stinging nettle 305 



Stinking Willie 437 



Stipa 301 



St. John's wort family 382 



Stonecrop 356 



Sulphur smoking 281 



Sumach family 377 



Sunflower 414 



Sweet clover 363 



Sweethearts 412 



Sweet life everlasting 429 



Switch grass 299 



Syntherisma linearis * 295 



Syntherisma sanguinalis 296 



Tall buttercup 339 



Tall hairy agrimony 356 



Tall lettuce 434 



Tall mustard 353 



Tall sorrel 310 



Tansy mustard 354 



