INDEX 



Abies, 244 

 Absciss layer, 50 



cause of formation of, 51 

 Absorption, 14, 39 

 Acacia, 244 

 Acer, 184 

 negundo, 112 

 rubrum, 108, 109 

 saccharinum, 224 

 saccharum, 126, 160, 223, 238 

 Adams, J., 128 



Adenostoina fasdculatum, 245, 246 

 Adventitious roots of corn, 22 



of dune plants, 39 

 Aeration and root growth, 20 

 iEstival season, 233 

 Agave, 52 



scabra, 53, 172 

 Agropyron, 19, 249 



glaucum, 257 

 Air, 138-143 



in water, 138, 139 

 roots, 24, 25 

 spaces, 45 

 Albertson, F. W., 254 

 Alders, 67, 229 

 Alfalfa, pollination of, 81 



transpiration of, 160 

 Alga;, 139, 145, 149, 167, 229 

 in arctic waters, 130 

 in hot springs, 132 

 in lichens, 114 

 Allard, H. A., 128, 129 

 Allenrolfea occidentalis, 152 

 Allogenic successions; 152 

 Alnus, 113, 229 

 Alpine communities, 252-254 

 fir, 244 



xerophyte, 159 

 Alway, F. J., 156 

 Amaranthus grxcizans, 185 



retroflexus, 207 

 Ambrosia beetles, 60 

 Ambrosia artemisiifolia, 224 



trifida, 223 

 Amelanchier, 245 



Ammophila arenaria, 153, 220, 221 

 Ampelnpsis, tendrils of, 93 

 Amphibius plants, 29 

 Anchorage, 17 

 Andromeda, 175, 230 

 Andropogon, 19, 226, 248, 257 



'^ 18 



Anemometer, 266 

 Anemophilous flowers, 66-67 

 Annual rings, 29 

 Annuals, 21, 36, 178 

 Antirrhinum, pollination of, 82 

 Ants, 77, 150 



leaf-cutting, 58 

 Apocynum androssemifolium, 222 

 Applied ecology, 255-260 

 Aquilegia, pollination of, 82 

 Arceuthobium, 184 



douglasii, 103, 104 

 Arctium, 126 

 Arctostaphylos, 245 

 uva-ursi, 221, 222 

 viscida, 164 

 Arissema triphyllum, pollination of, 86 

 Aristida, 249 



Aristolochia macrophyllum, 85 

 Armillarea mellea, 109 

 Arrow-leaf, 186, 229 

 Artemisia, 220, 251 



stelleriana, 221 

 Arum jnacidatum, pollination of, 85 

 Asarum, 182, 187 

 Asclepia's, 185, 223 

 Ash, 224 



pollination of, 68 

 Asparagus, 186 

 Association, 192-194 

 Associes, 198 

 Aster, 222 

 ericoides, 224 

 galls on, 112 

 linariif alius, 121 

 Atkins, W. R. G., 128, 156 

 Atmometers, 268 

 Atmospheric composition, 138 

 humidity, 140-141 

 pressure, 138 

 Atrophy, 110 

 Autecology, 13 

 Auten, J. T., 150 

 Autogamy, 65 

 Autogenic succession, 213 

 Autumnal season, 234 

 Azalea, 152 



B 



Bacteria, 113, 150 

 "Bad lands," 154 

 Bailey, I. W., 64 

 Bailey, T.owcll F., 166 



(273) 



