500 



GENERAL INDEX. 



Placenta, 419, 433 



Placodium, 309 



Plagianthus, 547 



Plane Tree, 487 



Plane Tree Family, 487 



Platanaceffi, 487, 565 



Platanus, 103, 487, 564, 565 



Platygraplia, 310 



Platyzoma, 376 



Plantaginaccae, 507 



Plantago, 106, 507 



Plantain. 106, 438, 473, 507 



Plantain Family, 507 



Plant Body, 133 



Plant-Cell, 15 



Plant Food, 175 



Plasmodium (pi. — a) 6, 207 



Plectospora, 303 



Plerome, 161 



Pleurocarpee, 359, 360 



Pleurocarpus, 235 



Pleurosigma, 330 



Plum, 63, 146, 392, 436, 530 



Plumbaginaceae, 507 



Plumbago, 508 



Plumule, 186, 386, 404, 474 



Phycoerytbrine, 376 



Poa, 279. 455 



Podisoma, (see Gymnoaporangium) 



Podocarpua, 409, 410 



Podogonium, 565 



Podopliyllum, 559 



Podosplia;ra, 371, 381, 283 



Pogonatum, 359 



Poison Hemlock, 520 



Poison Ivy, 165, 516, 535 



Poison Oali, 535 



Poison Sumach, 535 



Poke-berries, 173 



Poke-weed, 497 



Pole Bean, 188, 531 



Polemoniaceae, 503 



Polemonialea, 500 



Polemonium, 503 



Polianthes, 461 



Pollen, 34, 46, 136, 389, 417 



Pollen-sac, 394, 418 



Pollen Tube, 47, 391 



Pollination, 430, 421 



Pollinia, 503 



Polyactis, 288 



Polyandrous, 433 



Polyanthus, 468 



Polyartlirodactylse, 334 



Polycarpellary, 433 

 Polygala, 551 

 Polygalacete, 550 

 Polygalales, 550 

 Polygamous Flowers, 431 

 Polygonaceae. 64, 496 

 Polygonum. 323, 496, 497 

 Polygyncecial Fruits, 437 

 Polyliedral Cell, 19 

 Polyides, 277 

 Polvpetalae, 476. 518 

 Polypetalous, 431, 433 

 Polypodiaceae, 377 

 Polypodium, 109, 377 

 Polypori, 341 

 Polyporites, 331 

 Polyporus, 328, 330, 331 

 Polysepalous, 431, 432 

 Polysiphonia, 277 

 Polysipbonides, 278 

 Polysymnietrical Flowers, 430 

 Polytriclium, 150, 352, 359, 360 

 Pome, 436 

 Pomese, 527 

 Pomegranate, 533 

 Pond weeds, 466 

 Pontederacese, 457 

 Pontederales, 457 

 Porcupine Grass, 157 

 Portlandia, 518 

 Poplar, 438 

 Poppy, .')56 

 Poppy Family, 556 

 Populus, 150, 487, 564, 565 

 Populns, 103, 143 

 Portulaca, 197, 364, 549 

 Portulacacese, 540 

 Potamales, 466 

 Potamogeton, 131, 186 

 Potash Salts, 176 

 Potassium, 175 



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

 Potato Fungus, 364 

 Potentilla, 364 

 Potentillese, 538 

 Prickles, 137 

 Prickly Ash, 127, 542 

 Prickly Pear, 520 

 Pride of India Tree. 540 

 Primary Bundle, 131 

 Primary Cell- wall, 35, 68 

 Primary Cortex, 408 

 Primary Meristem, 86, 88, 89, 106 

 121, 138, 144, 161 



