846 



INDEX. 



Olibanum, 475 

 Oligandrous, 216 

 Oligospermous, 312 

 Olive, 533 

 Omam, 508 

 Omphalea, 583 

 Omphalobium, 476 

 Oinphalode, 329 

 OnagraccEe, 492 

 Oncidium, 604 

 Oncobese, j|4o 

 Onion, 615 

 Onobrychis, 479 

 Onygena, 649 

 Oogones, 272 

 Oogonia, 268 

 Oolitic flora, 748 

 Oophoridia, 278 

 Oosporangia, 272 

 Oospore, 268 

 Opening of flowers, 



262 

 Operculate, 199, 232, 



Operculum, 307 



Ophelia, 540 



Ophiocaryon, 459 



Ophioglossaceas, re- 

 production of, 281 



Ophioglossese, 639 



Ophiopogoneae, 614 



Ophrys, 604 



Opilia, 453 



Opium Poppy, 433 



Opoponax, 507 



Opposite, 102, 112 



Opuntia, 502 



Orach, 562 



Orange, 314, 454 



Orbicular, 87 



Orchid flower, section 

 of (Darwin), 373 



Orchids, fertilisation 

 of, by insects, 288 



■ nectaries in, 288 



Orchil, 647 



Orchidacea?, 602 



dehiscence 



fruit of, 306 



• fertilisation 



286 



Orchideous, 205 

 Order or family, 410 

 Orders in northern 



hemisphere, 678 

 in southern hemi- 

 sphere, 678 

 ■ restricted in dis- 

 tribution, 677 

 Orebim, 592 

 Oregon flora, 682 

 Oreodaphne, 569 

 Organic acids, 127 



bases, 170 



compounds, 124 



constituents of 



plants, 125 



Organ-nut, 429 

 Organogeny, 243 

 Organography, 718 

 Organs, compound, 25 

 elementary, i 



of 

 of. 



Organs of nutrition or 

 vegetation, 25 



of reproduction, 



25. 171 



of reproduction, 



functions of, 264 



subordination in, 



value of, 416 



suppression of, 



365 



symmetry of, 363 



Oriental Plane, 594 

 Origanum, 554 

 Omus, 533 

 Orobanchaceae, 550 

 Orris-root, 609 

 Orthoplocese, 340, 435 

 Orthotrichum, 643 

 Orthotropal, 255, 330 

 Orthotropous, 255 

 Orthospermae, 506 

 Oryza, 630 

 Osbeckia, 489 

 Oscillatoria, 654 

 Osmose, 143 

 Osmundese, 639 

 Osyris, 574 

 Otozamites, 749 

 Ourari poison, 538 

 Ouvirandra, 626 

 Ovary, divisions in, 



240 



or germen, 235 



position of, 246 



Ovenchyma, 4 

 Ovule, 235, 251 



coverings of, 233 



dehiscence of, 252 



■ number in the 



ovary, 257 



position in the 



ovary, 256 



Ovules of g^ymno- 

 sperms, 292 



Oxalic acid, 170 



OxaIidace£, 464 



Oxalis, movements in 

 leaves of, 377 



Oxlip, 558 



Oxycoccus, 526 



Oxygen in plants, 126 



absorbed by 



flowers, 258 



effect on colours, 



393 



in germination, 



345 



Oyster-plant of Ame- 

 rica, 522 



Pacific Islands, flora 



of, 684 

 Padina, 654 

 Paederia, 512 

 Pseonia, 427 

 Paiophyll, 392 

 Pakyoth, 496 

 Palaeontological bo' 



tany, 718 

 Palate, 207 

 Palea, 208 

 Paleee of artichoke, igo 



Palissya, 748 

 Paliurus, 473 

 Palma Christi, 581 

 Palmacites, 752 

 Palmse, 619 

 Palmate, 87 

 Palmatifid, 87 

 Palmellacese, 654 

 Palmite, 619 

 Palm, dichotomous 

 stem of, 69 



oil, 621 



Palms of chalk, 751 



phyllotaxis of, 



108 



Region of, 687 



stem, formation 



of, 66 



Palo de Vaca, 587 

 Palo de Velas, 541 

 Pampas-grass, 631 

 Panama hats, 624 

 Panax, 509 

 Pancratium, 612 

 Pandanaceae, 624 

 Pandanocarpum,, 751 

 Pandanus, 624 

 Panduriform, 87 

 Pangium, 440 

 Panicle, 177, 208 

 Panicum, 631 

 Panspermism, 15 

 Pansy, 441 

 Papaveracese, 433 

 Papaw, 314 



tree, 497 



Papayaceae, 496 

 Papayrolese, 440 

 Paper mulberry, 587 

 for drying plants, 



797 



reeds, 628 



Papilionaceous corolla, 



205 

 Papillae of roots, 38 



of epidermis, 30 



Pappus, 199 

 Papyrus, 628 

 Para rubber, 582 

 ParacoroUa, 210 

 Paraguay Tea, 530 

 Paraphyses, 210 

 Parasites, 40, 141 

 Parasitic fungi, 141 

 Parastemones, 210 

 Pareira-brava, 430 

 Parenchyma, 37, 80 

 Pariglin, 617 

 Paris, 618 

 Paritium, 448 

 Paridess, 618 

 Parietal placenta, 242 

 Parietaria, 584 



fertilisation of,283 



Parietin, 647 

 Pari-pinnate, 93 

 Parkia, 478 

 Parmelia, 647 

 Parmentiera, 541 

 Pamassia, 455 

 Parnassia, fertilisation 



of, 283, 286 



Paronychiacese, 498 

 Paropsia, 497 

 Parsley, 507 

 Parsnip, 507 

 Parthenogenesis, 265 

 Partite, 86 

 Partitions, 86 

 Passifloracese, 497 

 Passion-flower, 498 

 Pastilles, 529 

 Pastinaca, 507 

 Patchouly, 554 

 Patellae, 645 

 Patulous, 197 

 PauUinia, 459 

 Pavia, 459 

 Peach, 311, 485 

 Pear, 314, 486 

 Peas, 477 

 Pecopteris, 731 

 Pec tic and pectosic 



acid, 164, 321 

 Pectinate, 87 

 Pectinated stomata, 



637 

 Pedalieae, 540 

 Pedate, 87 

 Pedatifid, 87 

 Pedicel, 172 

 Pedicellate, 172 

 Peduncle, 172 



fleshy, 310 



hollow, 174 



Pedunculate, 172 

 Peg-grafting, 325 

 Pelargonium, 462 

 Pellitory, 584 



of Spain, 520 



Peloria, 552 

 Pelorisation, 372 

 Peltate, 87, 250, 257 

 Peltate hairs, 33 

 Penaeaceae, 571 

 Pencil-cedar, 599 

 Penicillium, 650 

 Penny-royal, 554 

 Pentadesma, '456 

 Pentagonal, 363 

 Pentamerous, 363 

 Pentandrous, 216 

 Pentapetalous, 203 

 Pentaphyllous, 197 

 Pentasepalous, 197 

 Penthorum, 500 

 Pentstemon, 551 

 Pepo or Peponida, 314 

 Pepper, 591 

 Pepper, Jamaica, 492 

 Pepper-brand, 399 

 Peppercorn, 403 

 Peppermint, 554 

 Pepperwort, 640 

 Perenchyma, 10 

 Perennial, 355 

 Pereskia, 501 

 Perfoliate, 100 

 Perianth, 193 

 Pericarp, 298, 300 

 maturation of the, 



T.3^9 , , 



Pencarpial coverings, 

 326 



