376 
Orchid, floral organs of, 255 
Orchidaceas, 256 
Orchidete, 256 
Order, 2 
Ordinary Parenchyma, 69 
Oregon balsam, 244 
Organs, essential, 142 
plant, 85 
reproductive, 85 
vegetable, 85 
Origanum, 344 
majorana, 344 
vulgare, 344 
Oscillatoria, 183, 184 
Ostwald, 62 
Ourouparia Gambir, 346 
Outline of plant groups, 3 
Ova, 240 
Ovary, 154 
Ovule, amphitropous, 155 
anatropous, 135 
campylotropous, 155 
orthotropous, 155 
shape of, 155 
Ovules, 154 
defined, 155 
in angiosperms, 155 
in gymnosperms, 155 
position of, 155 
Pachistima, 304, 303 
Palaquium, 328 
Palm oil, 248 
Palmaceae, 248 
Panax quinquefolium, 323, 324 
repens, 324 
Panicle, 139 
Papaver, 136 
somniferum, 281 
Papaveraceae, 280 
Papaverales, 280 
Papaw, 64 
Papaw Family, 317 
Papilionaceae, 289, 290 
Pappus, 160 
INDEX 
Paprika, 339 
Paraphyses, 194, 204, 235 
Parasite, 193 
Pareira, 276 
Parenchyma, 69 
assimilation, 69 
conducting, 69 
ordinary, 69 
reserve, 69 
Parietales, 314 
Parmelia, 230 
Parsley Family, 324 
Passiflora N. F., 316 
incarnata, 316 
Passifloraceae, 316 
Pathogens, 174 
Paullinia Cupana, 306 
Paulownia imperialis, 340 
Pea Family, 289 
Peach, 286 
Pear, 286 
Peat mosses, 233 
Pedalinaceae, 342 
Pedicularis, 340 
Peduncle, 137 
Peireskia, 317 
Pelargonium, 293 
capitatum, 294 
odoratissimum, 294 
Radula, 294 
Pellionia, 48 
Penicillium, 204 
brevicaule, 207, 210 
camemberti, 207, 209 
expansum, 208 
glaucum, 204, 207 
roqueforti, 206, 209 
Pentstemon, 147, 340 
Peony, 273 
Pepo, 165, 348 
Pepper Family, 239 
Pepsin, 64 
Perianth, 143, 145 
Periblem, 67, 68 
Pericambium, 90 
