INDEX 



Piper, C. v., 224 

 Pittier, Henri, 224, 221-229 

 Plants, aging in, physiological aspects 

 of, 380 

 anatomy of, 95, 583, 584 

 associations of, 330, 341 

 in Brazil, 263 



concept of, 329, 2>?>2, 341, 347 

 breeding of, 423 

 communities of, 335 

 comparative embryology of, 584 

 control in, of dormancy, 626 



of flowering, 626 

 cultivation of, 504 

 cytotaxonomy of, 194 

 diseases of {see Diseases of plants) 

 ecological formations of, 340 

 ecology of, 261, 329, 340, 362 

 economic value of, 504 

 evolution in {see Evolution in plants) 

 fossil, 585, 590 



geographical distribution of, 180, 194 

 growth in, 391 

 higher, classification of, 192 



floras and monographs of, 205 

 hormones in, 623 

 growth, 391 

 sex, 476 

 individual, life span of, 382 

 medicinal, 439, 442 

 morphology of, 582, 606 

 nutrient requirements of, 368 

 inorganic nutrient ions, 368 

 oxygen, 369 

 water, 369 

 phylogeny of, 585 

 physiology of, 615 

 poisonous, 498 

 populations of, 349 

 sex in, evolution of, 475 

 uptake mechanisms in, 376 

 water relations in, 624 

 Piatt, Rutherford, 464 

 Poeppig, E., 237 

 Pohl, J. P., 237 

 Poisonous plants, 408 

 PoHti, L., 245 



Polhnation and fruit set, 426 

 Polymyxin, 47, 447 



635 



Polyploidy, 153-165, 199, 424 

 artificial production of, 587 



in tobacco, 159 



in watermelons, 157 

 natural, 153 



in cotton, 154 



in grasses, 169 



in wheat, 154 

 Popenoe, Frederick Wilson, 17, 27, 224 

 Population studies in taxonomy, 193 

 Porsild, A. E., 213, 214 

 Potato, 53 



Potato blight, 53-59, 75 

 Prescott, Gerald W., 243 

 Pringle, C. G., 222 

 Proctor, George R., 227 

 Pulle. A. A., 231 



Quebracho, 526, 527 

 Quentin, L., 227 



Radford, A. E., 218 

 Radiation burns, use of Aloe for, 452 

 Rain forest in Brazil, composition and 

 structure of, 269 



life-form and leaf-size classes in, 291, 

 299 



phytosociology techniques applied to, 

 261 ff. 



trees in, 282, 284 

 Rambo, Balduino, 241, 309 

 Raper, J. R., 575 

 Raper, Kenneth B., 33-49, 574 

 Rauh, W., 236 

 Raup, Hugh M., 214 

 Raup, Karl, 212 

 Rauwolfia, 446 

 Ray, James D., 218 

 Reed, Howard S., 625 

 Regnell, A. F., 237 

 Reitz, P. Paulino, 241 

 Riboflavin production by fermentation, 



37-39 

 Rice, 508 



Richardson, John, 210 

 Rick, Charles, 236 

 Rickett, H. W., 222 

 Riedel, L., 237 



