INDEX 



791 



Nutrient salts, 237, 243 ; absorption of, 

 240 ; and agriculture, 243 ; transport 

 of, 242 



Nutrient substances, absorption of, 222 



Xuts, 583 



Xyctiiiastic movements, 356 



Nyctinasty, 357 



Nymphaea, *631 ; seed of, *581 



Nymphaeaceae, 630 



Oak, Quercus 



Oat, Arena saliva 



Ocean currents, distribution of seeds by, 



586 



Ochrea, 116 

 Ochrolechia, 475 

 Odonlites, 704 

 Oedogonium, 403, M05 

 Oenanthe, *681, 682 

 Oenothera, *674 

 Oidium, 441 

 Olea, 687, *688 

 Oleaceae, 687 

 Olive Tree, Olea, europaea 

 Olpidiopsis, 430 

 Ol-pidium, *429 

 Onagraceae, 674 



. 672 



Ontogeny, 2 

 Oogonium, *199, 369 

 Oomycetes, 430 

 Oosphere, 199, 369 

 Ophiocytium, 397 

 Ophioglossaceae, 504 

 Ophioglossum, *504, *505 

 Ophrys, 746 



Opium Poppy, Paparer somniferum 

 Optimum, 219 

 Opuntia, *173, 628, 629 

 Orchidaceae, 745 

 Orchis, *746, *747 S *748 ; root-tuber, 



*179 



Organic acids, 28, 268 

 Organic bases, 258 

 Organography, 71 

 Organs, 71 ; vegetative, 73 

 Origin of species, 316 

 Ornithogalum, *723, 725 

 Ornithophilous plants, 557 

 Ornithophily, 556 

 Ornithopus, 672 

 Orobanchaceae, 704 

 Orobancke, 191, *703, 704 

 Orthosticbies, 89 

 Orthotropous, 72, 123 

 Oryza, 734, 735, *736 

 Oscillarid, *377 

 Osmometer, 224 

 Osmosis, 224 



Osmotic pressure, 224 ; high, 227 

 Osmunda, *509 



Ostrich Fern, Struthioptens germanica 



Ourouparia, 705 



Ovaries, transverse sections of, *548 



Ovules, 198, 539, 540 ; position of, 549 



Ovum, 567 



Oxalis, movement, 337 



Oxygen, 244 ; evolution of, *248 



Padina, 415 



Pae&nia, 638 ; flower of, *197, *545 

 Palaeontology, 209 

 Palaeostachya, *521, 522 

 Palaquium, *685, 686 

 Palisade cells, 112 

 Palmae, 738 

 Pandanaceae, 737 

 Pandanus, 737, *741 

 Pandorina, 399 

 Panicle, 126, *127 

 Panicum, 734 

 Pantostomatineae, 381 

 Papaver, 95, *642, 643 ; seed of, *581 

 Papaveraceae, 640 

 Papilionaceae, 670 

 Papillae, *54 



Parasites, 188, 255, 256, 259 

 Parastichies, 90, *91 

 Paratonic movements, 337 

 Parenchyma, 48 ; assimilatory, 49 ; con- 

 ducting, 49 ; water- storage, 49 

 Paris, 725, 726, *727 

 Parmelia, *47l, *472 

 Parnassia, 659 

 Parsley, Petroselinum 

 Parsnip, Pastinaca 



Parthenocissus, *182, 658 ; tendrils, 355 

 Parthenogenesis, 193, 316, 577 

 Partial parasites, 191 

 Passiflvra, ovary of, *548 ; tendrils, 354 

 Pastinaca, 682 

 Paullinia, 655 

 Pavetta, 704 

 Payena, 686 

 Pea, Pis urn 



Pea, reserve material, *580 

 Peach, Prunus persica 

 Pear, Pyrus communis 

 Pectic substances, 38 

 Pediastrum, 401, *402 

 Pedicularis, 191, 259, 704 

 Peireskia, 628 

 Pelargonium, *651 

 Pellia, 488, 489 

 Peltigera, 472, 474 

 PenicUUum, *78, 441 

 Pentacyclicae, 684 

 Pentosanes, 37 

 Perception, 338 

 Perianth, 545 

 Periblem, 86 

 Pericarp, 583 



