INDEX 



415 



Crepis biennis, 59, 62 



bursifolia, 374 

 Cressa, 201 

 Crocus albiflortis, 48 



vernus, 120 

 Crucianelletum, 209, 373 

 Crumbing, of soil, 211 

 Crustose lichen communities, 263 

 Cryoplankton, 289, 370 

 Cryoscopic determinations, 129 

 Crypsis aculeata, 205 



alopecuroides, 205 

 Cryptogamic communities, 184 

 Crystalloids, 161 



particles of, 162 

 Cultural plant communities, 285 

 Cupressus macrocarpa, 146 

 Curve diagrams, 333 

 Curvuletum, 13, 17, 18, 55, 65, 120, 

 121, 155, 171, 172-174, 176-178, 

 181, 190, 246, 247, 248, 249, 262, 

 312, 313, 324, 333, 334, 343, 344, 

 350 



cetrarietosum, 155 



elynetosum, 155 



{See also Carex curvula and 

 Caricetum curvulae) 

 Cushion plants, 154, 292, 293, 307 



((See also Polster plants) 

 Cutting, changes due to, 283 

 Cyanocapsetum, 188 

 Cyclamen, 290 

 Cynoglossum, 276 

 Cynomorium coccineum, 6 

 Cyperaceae, 126 

 Cyperetum flavescentis, 364 

 Cyperus capitatus, 152, 318, 319, 373 

 flavescens, 64, 364 

 fuscus, 364 



pannonicus, 205 

 Cystococcus communities, 371 



humicola, 280 

 Cytisus nigricans, 283 



D 



Dacrydium caledonicum, 190 

 Dactylis glomerata, 320 

 Dactylococcus, 280 

 Dammar a ovata, 190 



Daphne cneorum, 34 



la ur cola, 90 

 Decaj^ in soils, 243 

 Deflected successions, 325 

 Delia segetalis, 59, 353 

 Denitrification, 241 

 Density, 26, 30 



determination of, 30 

 Dentaria, 252 

 Dependent unions, 5 

 Depth of soil and CO2, 226 

 Deschampsia caespilosa, 238 



flexuosa, 120, 250, 351, 365 

 Deschampsietum mediae, 209, 229, 



230, 376 

 Desert soils, 257 



steppes, associations of annuals, 

 202 

 Deserts, erosional, 116 



halophytic vegetation of, 202 

 Destructive species, 316 

 Development of vegetation and soil 



formation, 310 

 Developmental stages of vegetation, 



306 

 Dew, 116 



Dianlhus glacialis, 70 

 Diapensia lapponica assn., 155 

 Dicentra, 252 



Dicranoweisia crispula, 310 

 Dicranum falcatum, 122 

 Differential species, 59 

 Digitalis purpurea, 352 

 Dinobryon, 75 

 Diplotaxion, 373 

 Diplotaxis erucoides, 16, 373 

 Direct action of lime, 183 

 Disjunct species, 354 

 Disseminules, 308 

 Distichlis, 194, 199 

 Distribution, centers of, 351 



curves, of Jaccard, 54 

 of Romell, 54 

 District, definition of, 355 

 Division of labor, 5 

 Dolomite vegetation, 187, 188 

 Dominance, 39 



degree of, 33 

 Doronicum grandiflorum, 188 



suffruticosum, 190 



