414 



PLANT SOCIOLOGY 



Cold, protection from, 88 



resistance of roots, 222 

 Coleus blumei, 223 

 Colloids, 162 



complex, 249 



particles of, 162 



protective, 163 



saturated and unsaturated, 162 



protection of, to protoplasm, 88 

 Colonies, plant, 306 

 Colonization, 308 

 Comarum-Menyanthes belt, 346 

 Combination of species, characteristic, 



68 

 Commensal unions, 9 

 Commensalism, 10 

 Commensals, equal, 9 



unequal, 10 

 Communities, characteristics of, 363 



classification of, 361 



closed, 371 



dependent, 7 



development of, 305 



distribution of, 67, 343 



duration of, 370 



extra-regional, 366 



floating, 367, 369 



layered, 334, 335 



migration of, 350 



mixture of, 345 



of bacteria, 335 



of Bas Languedoc, classification of, 

 372 



of blue-green algae, 198 



one layered, 370 



origin of, 351 



primitive terminal, 334 



pioneer, 352 



relict, 352, 353 



semi-cultural, 344 



structure of, 26 



taxonomy of, 367 



two layered, 371 

 Community complex, 350 



evolution of, 305 



first stages of, 308 



units, higher, 363 

 Competition, 10, 11, 82, 302 



between individuals, 11 



factor in developing fidelity, 64 



Competition, factors of, 15 



of plant communities, 16 

 Complete sere, 322, 332 

 Concentration, osmotic, 193 



{See also Osmotic concentration) 

 Conopholis, 290 

 Conserving species, 316 

 Consociations, 306 

 Consolidating species, 316, 319 

 Constancy, 52 



and frequency, 58 



determination of, 55, 56 



diagrams of, 57 

 Constants, 41, 52 

 Constructive species, 316 

 Constructiveness and agressiveness, 317 



expression of, 316 



of species, determination of, 320 

 Convallaria tnajalis, 228 

 Convolvulus, 292 



soldanella, 67 



subhirsutus, 329 

 CoraUina, 346 

 Coronilla, 291 



einerus, 183 



minima, 183, 297 

 Coronopus ruellii, 374 

 Corlusa maithioli, 35 

 Corydalis, 49, 290 



cava, 49 

 Corylus, 124, 339 



americana scrub, 142 



rostrata, 333 

 Corynephoretum, 209 

 Corynephorus canescens, 67, 376 



-Helianihemum guttatum assn., 

 376 

 Cosmopolitan plants, 13 

 Cousinia pseudomollis, 329 

 Cover, 14, 26, 32 



determination of, 31 

 Covillea tridentata, 218, 226 

 Crataegus, 9 



monogyna, 69 

 Cratoneuron commutatum-Arabis belli- 

 difolia assn., 184 



irrigatum, 184 

 Creeping herbs, 292 

 Crenothrix manganifera, 191 



polyspora, 191 



