Ophioglossales, 257, 352 
Ophioglossum, 352 
Opiliaceae, 371 
Opposite leaves, 292 
Opuntia, 310, 370 
Orchidaceae, 360 
Orchidales, 299, 360 
Orchids, 299, 360 
Orchis, 299, 361 
Orders, 159 
Oreodoxa, 358 
Organic Acids, 140 
Origin of Phyla, 161 
of Zygophyceae, 181 
Orobanchaceae, 321, 367 
Orthotrichaceae, 350 
Orthotrichum, 350 
Oryza, 359 
Oryzeae, 359 
Oscillatoria, 165, 330 
Oscillatoriaceae, 165, 330 
Osmosis, 72 
Osmunda, 352 
Osmundaceae, 352 
Ostrich-fern, 259 
Ostropaceae, 343 
Ostrya, 372 
Ovary, 286, 292 
Ovulate, 275 
Ovule, 273 
Oxalic acid, 141 
Oxalidaceae, 362 
Oxalis, 326, 362 
Oxidases, 153 
P 
Padina, 337 
Palea, 297 
Palet, 297 . 
Palisade tissue, 292 
Palmaceae, 358 
Palmales, 296, 358 
Palmatin, 143 
Palmellales, 171, 332 
Palmettos, 300 
Palmitic acid, 140, 143 
Palms, 296, 358 
Panax, 372 
Pandanaceae, 357 
Pandorina, 172, 332 
INDEX 
Paniceae, 359 
Panic Grasses, 359 
Panicum, 359 
Pannariaceae, 340 
Pansy, 306 
Papaver, 364 
Papaveraceae, 364 
Papaws, 361 
Pappus, 312 
Parallel veined, 295 
Paraphyses, 203, 215 
Parasitic habit, 320 
Paratheliaceae, 343 
Paratonic movements, 123 
Parenchyma, 29 
Parental care, 110 
Parietal placentae, 303 
Parkeriaceae, 352 
Parmelia, 216, 340 
Parmeliaceae, 340 
Paronychia, 364 
Parsleys, 372 
Parsnip, 311 
Parthenocissus, 371 
Parthenogenesis, 324 
Passage of Water, 73 
Passiflora, 364 
Passifloraceae, 363 
Passion Flowers, 363 
Pastinaca, 311, 372 
Patellariaceae, 342 
Path of the Water, 75 
Pathology, 133 
Pea, 305, 308 
Peach, 314 
Pear, 313 
blight bacteria, 169 
Peat-mosses, 251, 349 
Pectase, 153 
Pectose, 5 
Pedaliaceae, 367 
Pediastrum, 172 
Pedicularis, 367 
Peireskia, 370 
Pelargonium, 306, 362 
Pellia, 349 
Peltigera, 340 
Peltigeraceae, 340 
Penaeaceae, 371 
Penicillium, 222, 344 
Penicillus, 195, 334 
399 
