974 
INDEX, 
Nymphseaceae, 536, 586, 600, 
633, 641, 654, 657. 
Oak, 614. 
Obdiplostemonoiis, 601. 
Oclmaceas, 660. 
Ochrolechia, 326. 
Octamerous, 642. 
Octants, 351. 
(Edogonieae, 244, 278. 
(Edogonium, 9, 22, 235, 279, 
897, 945 (Figs. 17, 163, 
182, 183). 
CEnotherese, 662. 
Oidium, 311. 
Oil, 52, 91, 706, 715. 
Oleacese, 643, 658 (Fig. 4^18). 
Olfersia, 436. 
Omphalaria, 328. 
Omphalodes, 598. 
Onagrarieae, 555. 
Onopordon, 640. 
Oocardium, 248. 
Oogonium, 3, 234, 267, 271, 
273, 279, 281 (Figs. 163, 
177, 179» 181, 183, 185). 
Oophore, 225, 342, 385, 421, 
488. 
Oosphere, 224, 234, 267, 350, 
355, 373, 425, 446, 486, 
523, 580, 897 (Figs. 163, 
177, 179, 181, 183, 185, 
236, 240, 256, 295, 314, 
331, 354, 355, 399)- 
Oospore, 224, 234, 343, 471, 
585. 
Oosporese, 244, 267. 
Opegrapha, 329. 
Open bundles, 650. 
Opening and closing of 
flowers, 872. 
Operculum, 345, 381 (Fig. 
266). 
Ophioglosseae, 385, 391, 410. 
Ophioglossum, 410, 412, 414, 
958 (Figs. 288, 290). 
Ophrydege, 557, 603, 628. 
Opuntia, 538, 566. 
Orchideae, 557, 576, 579, 
583, 586, 593, 603, 618, 
■ 627, 633, 908, 960 (Fig. 
410). 
Orchis, 571, 578 (Figs. 397, 
418). 
Order of succession of the 
parts of the flower, 608. 
Organic cc ntre, 203. 
Organs of plants, 149. 
Origin of species, 920. 
Ornithogalum, 580, 588. 
Orobanche, 214, 241, 634, 
649, 935. 
Orobancheae, 585, 658. 
Orthostichy, 188 (Fig. 154). 
Orthotropic, 854. 
Orthotropous, 492, 570. 
Oscillatorieae, 246, 247. 
Osmunda, 423, 435. 
Osmundaceae, 391, 410, 437, 
440. 
Ouvirandra, 625. 
Ovary, 493, 497, 558 (Figs. 
382-395). 
Ovule, 487, 491, 497, 498, 
570 (Figs. 343, 347- 
349, 397, 398, 400). 
development of, in An- 
giosperms, 576. 
development of, in Co- 
niferae, 520. 
development of, in Gne- 
taceae, 529. 
Oxalic acid, 699. 
Oxalideae, 660, 879. 
Oxalis, 882, 891. 
Oxygen, 691, 696, 698. 
Oxy-salts, 698. 
Ozothallia, 282. 
Paeonia, 614. 
Paleae, 150, 435, 602, 631. 
Paliurus, 599. 
Pallisade - parenchyma, 84, 
53 3, 735. 
Palmaceae, 624, 631. 
Palmella, 248. 
Palmellaceae, 46, 244, 248, 
329. 
Palms, 620, 623, 629, 938. 
Pandanaceae, 631. 
Pandorina, 234, 254 (Figs. 
162, 167). 
Pandorineae, 244, 253. 
Panicle, 596. 
Panicled inflorescences, 596. 
Pannaria, 328. 
Papain, 708. 
Papaver, 87, 616, 641, 647, 
654 (Fig. 464). 
Papaveractae, 87, 647, 657. 
Papayaceae, 87, 659. 
Papilionaceae, 607, 609, 613. 
Pappus, 538, 617, 940. 
Paraphyses, 309, 310, 325, 
336, 338, 343, 370, 435, 
441 (Figs. 205, 219, 227, 
253)- 
Parasites, 214, 242, 649, 720, 
942. 
Parastichy, 194. 
Paratonic action of light, 
757. 
Parenchyma, 83 (Fig. i). 
Parietales, 659. 
Paris, 188, 606 (Fig. 147). 
Parmelia, 327. 
Parnassia,642,856 (Fig. 441). 
Paronychieae, 645, 661. 
Parthenogenesis, 275, 593, 
902. 
Passiflora, 536, 865, 870. 
Passifloraceae, 659. 
Pastinaca, 183 (Fig. 140). 
Paullinia, 653. 
Pectinaceoussubstances,7o6. 
Pediastrum, 70, 256 (Figs, 
54, 169). 
Pedicularis, 588, 648. 
Peduncle, 491. 
Peganum, 610, 644. 
Peissomelia, 289. 
Pellia, 352, 360, 395, 422, 
945. 
Peltigera, 319. 
Pelvetia, 282. 
Penicillium, 226, 306, 314. 
Pentamerous, 641. 
Peperomia, 579, 
Perianth, 490, 528, 538. 
Periblem, 147, 163, 500,952 
(Fig. 114). 
Pericambium, 115, 134, 167 
(Figs. 96, 106, 114, 125). 
Pericarp, 594, 615. 
Perichaetium, 343, 371. 
Periderm, 95, 106. 
Peridium, 306, 333, 340 (Fig. 
231)- 
Perigynae, 661. 
Perigynium, 343, 350 (Fig. 
236). 
Perigynous, 559. 
Periodic movements of or- 
gans, 878. 
Periodicity of growth in 
length, 817, 823. 
Periodicity of tension, 808. 
Perisperm, 492, 586. 
Peristome, 381 (Figs. 266, 
267, 273). 
Perithecium, 308, 312, 313, 
317, 323 (Figs. 207, 208, 
209). 
Permanent tissue, 82. 
Peronosporeae, 244, 275, 955. 
Persea, 555. 
Pertusaria, 319, 326 (Fig. 
220). 
Petal, 538. 
Petiole, 212, 640. 
Peziza, 11, 310 (Figs. 205, 
206). 
Phaeosporeae, 283, 956. 
Phalloideae, 341. 
Phallus, 340 (Fig. 231). 
Phascaceae, 377, 380. 
Phascum, 375. 
Phaseolus, 24, 134, 135, 147, 
561, 636 (Figs. 21, 106, 
107, 113, 385, 437). 
Phegopteris, 430, 441. 
Phelloderm, 107 (Fig. 90). 
