INDEX 



759 



Oomycetes, 380 



OphiorAjlium, 355 



Opliioglossaceae, 447 



OpUoglossum, 47, 447, *448, *449 



Ophrys, 712 



Oiiium Poppy, Papaver somrti/erum 



Optimum, 178 



Opuntia, *27, 571 



Orchidaceae, 711 ; tubers of, 48 



Orchis, *48, 712, *712, *713, *714 ; 

 pollination, 496 



Organic acids, 70 



Organography, 10 



Organs, internal construction of, 265 



Origanum, 655 



OriiithogalaiH, *73, *703 



Ornithophilous plants, 497 



Ornithophily, 496 



Ornithopius, 627 



Orobanchaceae, 661 



Orobanche, 224, 662, "666 



Orthospermae, 637 



Orthostichies, *41 



Orym, *692, 693 



Oscillaria, *340, 341 



Osmotic pressure, 183, 184 



Osmunda, *452, 45^ 



Osmundaceae, 453 



Ostrich fern, Struthiopteris 



Ourovparia, 664, 667 



Ovary, *484, *486 



Ovule, 279, 476, 485 ; anatropous, 476 ; 

 atropous, 476 ; camiiylotropous, 476 ; 

 position of, 485 



Ovuliferous scale, 536 



Ovum, 511 



Oxalidaceae, 601 



O.'calis, 601 ; hedysaroides, movement, 299 



Oxidation of inorganic material, 245 



Oxygen, 264 ; absorption of, 211 ; evolu- 

 tion of, 215 ; intiuence on growth, 264 



Padina, 370 



Paeonia, *482, 579 ; flower of, 37, *482 

 Palaqiiium, 641, *642 

 Paleae, 450 

 Palisade cells, 132 

 Palmae, 695 

 Pandanaceae, 695 

 Pandanus, 695, *696 

 Pamdorina, 358 

 Panicle, 490, *492 

 Panicion, 693 



Paparer, *517, 587, *588 ; seed of, *517 

 Papaveraceae, 587 

 Papaw, Carica pxqjaya 

 Papilionaceae, 623 

 Parallel venation, 685 

 Parasites, 222, 229 ; partial, 229 ; reduc- 

 tion of the shoot in, 26 ; lOots if, 49 

 Parasitic bacteria, 337 



Parastichies, *41 



Paratonic movements, 299 



Parenchyma, 107 



Paris, 705, *706, 707 



Parmelia, 421 



Parnassia, 611 



Paronychieae, 570 



Parsley, Petroselinum 



Parsnip, Pastinaca 



Parthenogenesis, 96, 283, 425 



Passifiora, 628 



Passitloraceae, 627 



PassiHorinae, 627 



Passion Flower, Passiflfjra 



Pastinaca, 638 



Pathogenic bacteria, 337 



Paullinia, 607 



Payena, 641 



Pea, *516 ; reserve material, *516 



Pea, Pisum 



Peach, Prunus pcrsica 



Pear, Pyrus communis 



Pectin substances, 77 



Pediastrum, ■*'359 



Pedicularis, 230, 660 



Peireskia, 571 



Pelargonium, *600 



Pellia, 434, 435 



Peltigera, 421 



PenicHlium, *391, 392 



Pennatae, diatomeae, 351 



Pentacyclicae, 640 



Peperomia, 560 



Perianth, 40, 482 



Periblem, *104 



Pericarp, 518 



Perichaetiuni, 437 



Pericliual walls, 103 



Pericycle, 128 



Periderm, 156 



Peridiueae, 345 



Perigone, 483 



Perigynous flowers, *486 



Periodicity, 271 



Perisperm, 516 



Peristome, 441, *441, *442 



Periwinkle, Vinca 



Peronospora, 383, *384 



Perouosporeae, 382 



Persea, *582, 585 



Personatae, 656 



Petals, 38 



Petasites, 684 



Petites especes, 291 



Petroselinum, 638 



Petunia, *656, 658 



Peziza, *395 



Phacelia, 652 



Phaeophyceae, 366 



Phaeophyll, 62, 368 



Phaeosporeae, 369 



