INDEX 



737 



piperitae, 660 ; menthae viridis, 660 ; 

 olivae, 649 ; pini, 498 ; ricini, 618 ; 

 rosae, 599 ; rosmarini, 660 ; santali, 

 644 ; terebinthinae, 498 ; theo- 

 bromatis, 626 



Olibanum, 614 



Olive, Olea 



Olpidium, *381 



Onagraceae, 632 



Onoclea, 446 ; spermatozoid, *92 



Ononis, 607 



Ontogeny, 2, 9 ; of the internal structure, 

 154 ; of the cell, 80 ; repeating phy- 

 logeny, 162 



Oogamotis fertilisation, 331 



Oogonia, 331, *371 



Oomycetes, 379 



Oosphere, 331 



Oospore, 331 



Ophioglossaceae, 443 



Ophioglossum, 443, *444, *445 ; adven- 

 titious shoots, 47 ; cork, 148 



Ophrys, 549 



Optical apparatus, 102 



Optimum, intensity of stimulus, 176 ; 

 temperature, 258 



Opnntia, *26, 630, 631 ; cladodes, 26 



Orchidaceae, 73, 548 ; aerial roots, 48 ; 

 climbing roots, 48 ; epiphytes, 213 ; 

 mucilage, 71, 79 ; raphides, 78 ; root 

 tubers, 48 ; siliceous bodies, 78 ; 

 velamen, 109 



Orchis, *48, *548, *549, *550 



Organic, acids, 80, 225 ; compounds, syn- 

 thesis of, 5 



Organography, 10 



Orientation, 267 



Origanum, 660 



Ornithocercus, *343 



Ornithogalum, *539, 541 ; cell wall, 71 ; 

 endosperm, *66 



Oruithophilous plants, 308 



Ornithopus, 609 



Orobauchaceae, 666 



Orobanche, 229, 666, *670 



Orthospermae, 639 



Orthostichies, 41 



Orthotropic, 273 



Oryza, 76, *529 ; starch, 75 



Oscillaria, *338, 339 



Osmosis, 179, 195, 204 



Osmotic pressure, 180 



Osmunda, *448 



Osnuindaceae, 449 



Ostrich fern, Struthiopteris 



Ourouparia, 672, 673 



Ovule, *472 



Ovuliferous scale, 495 



Ovum, 514 



Oxalic acid, 80 



Oxalidaceae, 610 



Oxalis, 610 ; movements, 292 ; organic 



acid, 80 

 Oxydases, 223 

 Oxygen, 187 ; in plants, 188, 189 ; liberated 



in photosynthesis, *219 



Padina, 370 



Paeonia, *502, 577 ; flower, *38 



Palaguium, 646, *647 



Palea, 526 



Palisade cells, 121, 122; parenchyma, 



*122 

 Palmae, 530 ; secondary growth of, 127 ; 



type of vascular system, 125, 126 ; 



siliceous bodies, 78 ; stability, 178 ; 



wax, 101 



Palmate leaves, 33 

 Pandanaceae, 530 ; secondary growth of, 



127 

 Pandatius, 530, *533 ; adventitious roots, 



49 ; leaves, 40 

 Pandorina, 355 

 Panicle, *510, *511 

 Panicum, 529 

 Pansy, Viola tricolor 

 Papaver, *475, *586, 587 ; laticiferous 



vessels, 94 ; vascular bundles, 124 

 Papaveraceae, 585 

 Papaver is capsulae, 587 

 Papaw, Carica papaya 

 Papilionaceae, 605 ; tendrils, 44 

 Papillae, 105 



Parallel-veined leaves, 34, *522 

 Paramecium, symbiosis with algae, 234 

 Para nuts, Bertholletia excelsa 

 Parasites, 227 ; reduction of shoot in, 27 

 Parastichies, 41 

 Paratonic movements, 272 

 Parenchyma, 99, 112 

 Parietal placentation, 504 

 Paris, *542, 543 

 Parnassia, 593 

 Paronychieae, 571 

 Parsley, Petroselinum 

 Parsnip, Pastinaca 

 Parthenogenesis, 93, 303, 365 

 Partial fruits, 519 

 Partite leaves, 33 

 Passiflora, *504, 630 

 Passifloraceae, 630 

 Pastinaca, 641 

 Paullinia, 620 ; anomalous thickening, 



*143 



Payena, 646 

 Pea, Pisum 

 Pectin compounds, 99 

 Pedate leaves, 34 

 Pediastritm, *356 

 Pedicnlnris, 231, 666 

 Peireskia, 630 

 Pelargonium, *610 



3 B 



