454 INDEX. 



Page. 



Pennsylvania persicaria 308 



Penny cress 355 



Pennyroyal 398 



Pepper-grass '. .350, 351, 352 



Petiole, the stem of a leaf. 



Physalodes : 403 



Phytolacca 327 



Pigeon berry 327 



Pigeon grass 302 



Pigweed 317, 318, 319, 320, 321, 322 



Pink family 330 



Pinnatifid, pinnately veined with marginal divisions reaching about half way to the mid-rib. 

 Placenta, a part of the ovary to which the ovules or seeds are attached. 



Plantaginaceae 409 



Plantago 409, 410, 411 



Plantain 409, 410, 411 



Plantain family 409 



Poa annua 298 



Poa compressa 300 



Poa pratensis 300 



Poison elder 377 



Poison hemlock 385 



Poison ivy 377 



Poison sumach 377 



Pokeweed 327 



Polygonaceae 306 



Polygonum aviculare 306 



Polygonum Hydropiper 307 



Polygonum lapathifolium 308 



Polygonum pennsylvanicum 305 



Polygonum Persicaria 309 



Poppy 312 



Poppy family 441 



Porcupine grass 301 



Portulaca 338 



Potato family 402 



Potentilla 358, 359 



Prickly lettuce 434 



Prickly Sida 381 



Primrose family 387 



Primulaceae 387 



Prostrate, lying fiat upon the ground, but not rooting; procumbent; compare creeping. 



Prostrate amaranth 324 



Prunella 401 



Pubescent, clothed with soft and rather short hairs. 



Pulse family 360 



Pump, to spray for weeds 286 



Purple Jimson weed 402 



Purple-stemmed swamp-beggar ticks 420 



Purple thorn apple 402 



Purselane 338 



Purselane speedwell 408 



Pussley 338 



Quack grass 289 



Quackgrass, how spread 284 



Quackgrass, to kill 284 



Quartz, ground and colored for clover seed 282 



Rabbit-foot clover 364 



Ragweed 415 



Ragweed family - 414 



Ranunculaceae 339 



Ranunculus acris 339 



Ranunculus bulbosus 340 



Ranunculus repens 340 



Red clover 366 



Red root 395 



