Conard, H. S., 179 

 Constancy, 121, 124-126, 129 



and fidelity, 126 



classes of, 124 



definition, 124 

 Constant. See Species, constant 

 Consumer, 60 



Contagious distribution, 1 13 

 Continuum, 68, 69, 73, 140, 141 

 Convergence, 160 

 Cooper, W. S., 156, 158 

 Corn {^ea mays), 13, 38 

 Cornbelt, 35 



Cormculana divergens (Lichen), 63 

 Cornus (Dogwoods) 



altermfolia (pagoda D.), 83; canadensis 

 (bunchberry), SO;Jlorida (flower- 

 ing D.), 81, 83 

 Cotton (Gossypium), 38 

 Coumarin, 111 

 Coverage. See Cover 

 Cover, 78, 102-105 



and dominance, 128 



and frequency, 113, 119 



and physiognomy, 186 



definition, 102 



herbage, 102 

 Crabgrass. See Digitaria 

 Creosote bush. See Larrea 

 Cryptophyte, 78 

 Cumberland Mountains, 83 

 Cycle, alternative, 145 



intercommunity, 146 



phasic, 21, 140, 145, 155, 164, 165, 

 166 

 and climax criteria, 159 

 definition, 142 

 Cynodon dactylon (Bermudagrass), 10, 



16 

 Cypress, Monterey {Cupressus macro- 



carpa), 26 

 Czechoslovakia, 87 



Dactylis glomerata (Orchardgrass), 11, 



33, 36, 38, 48, 130 

 Dallisgrass {Paspalum dilatatum), 52 

 Daniker, A. U., 177 

 Dansereau, P., 186 

 Danthoma (Oatgrasses), 31-32 

 spicata (poverty O.), 155 



Daubenmire, R. F., 187 



Decomposer, 60 



Deferred rotation grazing, 114 



Degradation, 155 



Degree-hour, 1 1 



Denmark, 113 



Density. See Population density 



Density-dependent factor, 100 



Density-governing factor, 100 



Density-independent factor, 100 



Deposition, and grouping of species, 



73 

 Deschampsia (Hairgrasses) 



caespitosa ssp. genuina (tufted H.), 91, 

 96; Jlexuosa (crinkled H.), 17, 63, 

 157 

 Desert, 11, 20, 32, 40 



phenology of plants in Arizona, 88, 

 94 

 Diapensia lappomca (Diapensia), 36 

 Dice, L. R., 186 



Dicranum fusee scens (Moss), 18, 63 

 Digitaria sanguinalis (Crabgrass), 153 

 Discontinuity, in distribution of spe- 

 cies, 69, 73, 136 



in environment, 138 

 Dispersion, over-, 113 

 Disporum lanugmosum, 80 

 Dispersal, of seeds and spores, 38-39 



of species, 39-40 

 Distichlis stricta (Desert saltgrass), 71, 



95, 128, 144 

 Distribution of species, 112 



contagious, 113 



geographic, 16 



normal, 113 



random, 1 13 

 District, biotic, 186 

 Diversity of species, and climax cri- 

 teria, 159, 160, 163 



in a community, 71-72 

 Dodonaea community, 36 

 Donnan equilibrium, 31 

 Dominance, 72, 128-130, 156, 173 



and community classification, 177- 

 178 



and physiognomy, 185 

 Dominant species, 30, 32, 58, 125, 128 



and grouping of species, 62-63, 73 

 Dormancy, 40 



lamclea 



207 



