INDEX 



431 



Rinodina demissa, 241 



Riss glaciation, 314 



Rock clinging communities, 187 



crevice associations, 184, 187 

 Rocks, weathering of, by organisms, 242 

 Root, competition, 10 



development, 43 

 of salt plants, 197 



growth, 218 



and carbon dioxide, 226 



layering, 43, 44, 45 



mass, 33 



suction and osmotic concentration, 

 128 

 Roots, sensitive to light, 43 

 Rosa arvensis, 69 



persica, 329 



spinosissima, 67 

 Rosette plants, 291, 292 

 Rosmarinus, 271 



-Cistus stage, 326 



-lAthospermum fruticosum assn., 15, 

 42, 184, 316, 317, 376 

 Rubia peregrina, 87, 95, 130 

 Rubus, 239 



fruticosxis, 101 

 Rudbeckia, 102 



niiida, 103 

 Ruderal plants, 276 

 Rumex, 276 



acetosella, 239 



alpinus, 61, 277 



-Chenopodium bonus henricus a&sn., 

 277 

 Ruppia marilima, 374 

 Ruppion maritimae, 374 

 Ru^cus aculeatus, 90 



S 



Saccharomycodes, 309 

 Sagina apetala, 364 



dliata, 364 



marilima, 230 



saginoides, 310 

 Sahcetum herbaceae, 110, 121, 123, 190 

 Salicion herbaceae, 60, 122, 123 

 Salicornia, 196, 205, 308 



fruticans, 197 



fruticosa, 58, 192, 230 



Salicornia, herbacea, 192, 193, 196, 199, 

 202 

 assn., 197, 198 

 -Suaeda marilima assn., 202 

 macrostachya, 60, 130, 192, 194, 197, 



230, 231 

 radicans, 60 

 rubra, 199 

 utahensis, 199 

 Sahcornietalia, 371, 374 

 SaUcornietum fruticosae, 58, 197, 198, 

 374 

 inuletosum, 374 



macrostachyae, 197, 230, 231, 374 

 radicantis, 197, 206, 374 

 SaUcornion, 374 



fruticosae, 60, 192 

 Saline communities, zonation of, 197 

 soils, 191 



Mediterranean, 205 

 osmotic value of solution, 205 

 sulphates of, 199 

 Salix, 149, 325, 339, 346 

 caprea, 308 

 -Dry as carpet, 321 

 herbacea, 123, 315 



assn., 110, 120, 122, 123, 346 

 incana, 330 

 nigra, 223 



purpurea-S. atrocinerea assn., 377 

 reticulata, 294, 310 

 retusa, 294, 310 

 serpyllifolia, 71, 152, 185 

 Salsola, 194, 201 



crassa assn., 202, 374 

 kali, 67, 194 

 lanata, 202 

 vermiculata, 33 

 Salt concentration in soil, seasonal 

 fluctuations of, 196 

 content of soils, Great Salt Lake, 199 



and ground water level, 199 

 lye, 201 

 migration, 204 

 optimum, of floating and submerged 



communities, 196 

 plants, 192 



germination of, 197 

 root development of, 197 

 secretions, 201 



