600 



GENERAL INDEX. 



Placenta, 419, 433 



Placodium, 309 



Plagianthus, 547 



Plane Tree, 487 



Plane Tree Family, 487 



Platanaceae, 487, 565 



Platanus, 102, 487, 564, 565 



Platygrapha, 310 



Platyzoma, 376 



Plantaginaceae, 507 



Plantago, 106, 507 



Plantain. 106, 428, 472, 507 



Plantain Family, 507 



Plant Body, 133 



Plant Cell, 15 



Plant Food, 175 



Plasmodium (pi. a) 6, 207 



Plectospora, 302 



Plerome, 101 



Pleurocarpee, 359, 360 



Pleurocarpus, 235 



Pleurosigma, 230 



Plum, 62, 146, 292,426,530 



Plum bagi nacese, 507 



Plumbago, 508 



Plumule, 186, 386, 404, 474 



Phycoerythriue, 276 



Poa, 279. 455 



Podisoma, (see Gymnosporangium) 



Podocarpus, 409, 410 



Podogonium, 565 



Podophyllum, 559 



Podosphsera, 271, 281, 283 



Pogonatum, 359 



Poison Hemlock, 520 



Poison Ivy, 105, 516, 535 



Poison Oak, 535 



Poison Sumach, 535 



Poke-berries, 173 



Poke- weed, 497 



Pole Bean, 188, 531 



Polemouiacese, 503 



Polemoniales. 500 



Polemonium. 503 



Polianthes, 461 



Pollen, 34, 46, 136, 389, 417 



Pollen-sac, 394, 418 



Pollen Tube, 47, 391 



Pollination, 420,421 



Pollinia, 503 



Polyactis, 288 



Polyandrous, 432 



Polyanthus, 468 



Polyarthrodactylae, 334 



Polycarpellary, 433 

 Polygala, 551 

 Polygalacese, 550 

 Polygalales, 550 

 Polygamous Flowers, 431 

 Polygonaceae, 64, 496 

 Polygonum, 323, 496, 497 

 Polygyncecial Fruits, 437 

 Polyhedral Cell, 19 

 Polyides, 277 

 Polypetalte, 476.518 

 Polypetalous, 431, 432 

 Polypodiacese. 877 

 Polypodium, 109, 377 

 Polypori, 241 

 Polyporites, 331 

 Polyporus, 328, 330, 331 

 Polysepalous, 431, 432 

 Polysiphonia, 277 

 Polysiphonides, 278 

 Polysyinmetrical Flowers, 430 

 Polytrichum, 150, 352, 359, 360 

 Pome, 436 

 Pomea;, 527 

 Pomegranate, 523 

 Pondweeds, 466 

 Pontederacese, 457 

 Pontederales, 457 

 Porcupine Grass, 157 

 Portlandia, 518 

 Poplar, 428 

 Poppy, 556 

 Poppy Family, 556 

 Populus, 150, 487, 564, 565 

 Populus, 102, 143 

 Portulaca, 197, 264, 549 

 Portulacaceae, 549 

 Potamales, 466- 

 Potamogeton, 131, 186 

 Potash Salts, 176 

 Potassium, 175 



Potato, 56, 58, 166, 181, 187, 500 

 Potato Fungus, 264 

 Potentilla, 264 

 Potentilleae, 528 

 Prickles, 137 

 Prickly Ash, 127, 542 

 Prickly Pear, 520 

 Pride of India Tree. 540 

 Primary Bundle, 121 

 Primary Cell-wall. 35, 68 

 Primary Cortex, 408 

 Primary Meristem, 86, 88, 89. 106 

 121, 138, 144, 161 



