282 



INDEX 



Rafflesia arnoldii, 104 



Kafflesiacese, 104 



Ragweed, 223, 224 



Rainfall, 146, 161-163 



Ramsbottom, J., 117 



Ranunculus aquatilis, 229 



Raspberry, vegetative reproduction of, 



28, 29 

 Raunkiaer, 175 

 Rayner, M. Cheveley, 117 

 Reaction, 211-213 

 Red fir, 244 

 Redwood, 245 

 Reed, 168 

 Reed, H. S., 166 

 Reymann, Elsa, 261 

 Relative humidity, 141 

 Reproduction, vegetative, 27 

 Respiration, 45 



in roots, 20 

 "Rest period," 19 

 Rhizines, 26 

 Rhizoids, 25, 169 

 Rhizomes, 27 



Rhododendron, 110, 152, 258 

 Rhus, 223, 251 



glabra, 225 



toxicodendron, 224 



trilohata, 154, 245 



vernix, 230 

 Rice, 139 



Ridley, H. N., 191, 254 

 Rigg, George B., 174, 179 

 Robbins, W. W., 231 

 Roberts, Edith A., 261 

 Robertson, C, 237 

 Robinson, G. W., 257 

 Rodents, 150 

 Rodrigo, P. A., 72 

 Root climbers, 93 



contraction, 22 



duration, 21 



hairs, 14, 167 



tubercles, 30, 113 

 Roots, 14 



and transplanting, 23 



in swamps, 20 



in xeric habitats, 170 



of water plants, 24 



position in soil, 22 



storage in, 18 



tuberous, 18 

 Root-tip, 14 



Rosemary, bog, 175, 230 

 Rosen weed, 127 

 Rosendahl, R. O., 117 

 Roses, galls on. 111, 112 

 Rosette herbs, 178 

 Rosites gongylophora, 59 

 Rubus, 226, 227 

 Ruderal plants, 201 

 Rumex acetosella, 152 



Runners, 28 

 Runyon, E. H., 179 

 Russell, Edward J., 157 

 Russian thistle, 185 



Sage, 251 



Sagebrush desert, 251 

 Sagittaria, 186, 229 

 Saguaro, 252 

 Salicornia rubra, 152 

 Salisbury, E. J., 157, 254 

 Salix, 185, 216, 229 



longifolia, 222 



nigra, 224 

 Salmon, S. C., 137 

 Salsola kali tenuifolia, 185 

 Salter, Robert M., 157 

 Saltwort, 152 

 Salvia, 251 



Salvinia, leaves of, 24, 52 

 Sampson, Arthur W., 231, 261 

 Sand, 146, 220 



binding plants, 18, 153 



dunes, 18, 39, 153, 220 



verbena, 152 

 Sanguinaria, 36, 187, 232, 233 

 Saprophytes, 102 

 Sarracenia minor, 63 



purpurea, 63, 230 

 Sarvis, J. T., 261 

 Sassafras variifolium, 223, 227 

 Saturation deficit, 140 

 Saunders, A. R., 137 

 Scarth, G. W., 137 

 Schaffner, J. H., 129 

 Schimper's first law, 134 



second law, 156 



third law, 165 

 Schuster, C. E., 88 

 Scientific method, 263 

 Scirpus, 168, 229 



fluiatilis, 226 

 Sclereids, 30, 31 

 Sclerenchyma cells, 30 

 Sclerophyllous evergreens, 33 



forests, 165 

 Sclerotia, 107 

 Scofield, C. S., 157 

 Scrophulariacese, 104, 105 

 Scutellaria, 229 

 Sea-rocket, 221 

 Sears, Paul Bigelow, 231 

 Secondary bare areas, 202 



seres, 202 

 Sedges, 249 



pollination of, 70 

 Seeley, Dewey Alsdorf, 137 

 Self-sterility, 77 

 Sensitive plant, leaf movements of, 50 



