INDEX 



465 



Operculum, 287 

 Ophioglossales, 3 

 Opium, 94, 333 

 Optical combination, 32 

 Opuntia, 370 

 Opuntiales, 370 

 Orcein, 282 

 Orchid family, 305 



floral organs of, 307 

 Orchidaceae, 305 

 Orchideae, 307 

 Orange, fruit of, 210 

 Order, 2 



Orders, naming of, 7 

 Ordinary Parenchyma, 101 

 Oregon balsam, 295 

 Organs, essential, 181 



plant, 121 



reproductive, 121 



vegetative, 121 

 Origanum, 397 



majorana, 397 



vulgare, 397 

 Oscillatoria, 228, 229 

 Osmic acid, 23 

 Ostwald, 94 



Ourouparia Gambir, 398 

 Outline of plant groups, 3, 4 

 Ovary, 195 

 Ovule, amphitropous, 197 



anatropous, 197 



campylotropous, 197 



immature angiospermous, Fig. 

 of, 201 



matured embryo sac in angio- 

 spermous ovule, Fig. of, 

 201 



orthotropous, 197 



shape of, 197 

 Ovules, 195 



denned, 196 



in angiosperms, 196 



in gymnosperms, 196 



position of, 196 

 30 



Ovum, 43 

 Oxytropism, 64 



Pachistima, 356, 357 

 Palaquium, 380 

 Palm cocoanut, 299 



Date, 299 



Family, 299 



oil, 300 

 Palmeae, 299 

 Panax quinquefolium, 376 



repens, 376 

 Pandorina, 232 

 Panicle, 179 



Pansy, papillae on epidermis. 108 

 Papaver, 332 



latex of, 94 



placenta tion in, 197 



somniferum, 333 

 Papaveraceae, 332 

 Papaverales, 332 

 Papain, 96, 369 

 Papaw, 96, 369 

 Papaw Family, 369 

 Papilionaceae, 341, 342 

 Pappus, 202 

 Paprika, 391 

 Papyrus, 409 

 Paraphyses, 245, 256, 286 

 Parasite, 247 

 Pareira, 328 

 Parenchyma, 101 



assimilation, 101 



conducting, 101 



ordinary, 101 



phloem, IDT 



reserve, 103 



wood, 101 

 Parietales, 366 

 Parmelia, 282 

 Parsley Family, 377 

 Passiflora, 183, 369 

 Passiflora N. F., 369 



incarnata, 369 



