INDEX 



abnormal succession, 274 

 absolute humidity, 25 

 absorption, 38 



relation between, and transpira- 

 tion, 38 

 abundance, 205 

 Acacia, 162 

 Acer, 242 



negundo, 126 

 achene, 132 

 Aconitum, 120 



columhianum, 57 

 acospores, 243 

 Adansonia, 117 

 adaptation, 4, 190 



origin by, 192 



to excessive water supply, 152 



to light, 171,181 



to small water supply, 144 



to water, 144 



types produced by, to water, 155 

 adjustment, 4 



abnormal, 5 



kinds of, 5 



normal, 5 



to contact, 141 



to gravity, 135 



to the habitat, 265 



to light, 71 



to shock, 142 



to temperature, 90 



to water, 38 

 adventitious, 273 

 adventive, 273 



seohan soils, succession in, 278 

 sestival flowers, 130 

 Agave, 160, 162 



amerwana, 147 

 age of plants, 112 

 agents of migration, 244 

 aggregation, 220, 237 



mixed, 239 



simple, 237 

 Agropyrum caninum, 207 

 aianthous flowers, 130 



air-spaces, 59, 175 

 Alisma, 167 



alkalies, influence of, 147 

 Allionia, 157, 182, 184 



linearis, 86, 178, 173, 179, 182, 184 



nyctaginea, 182 

 Allium, 133, 207 



recurvatum, 134 

 allogamy, 124 



alluvial soils, succession in, 277 

 alpine plants, 27, 98 

 alternating stages, 286 

 alternation, 220, 289 



causes of, 289 



corresponsive, 291, 294 



due to competition, 291 



due to ecesis, 290 



kinds of, 291 



normal, 291, 292, 293 



numerical, 291, 293 



relation l^etween, and zo nation, 289 

 altitude, 22, 27, 63 



effect on light, 76 

 amides, 101 

 Amorpha, 227 



amphibious plants, 153, 166 

 ancestral factor, 186 

 Andropogon, 226, 293 



consocies, 226 

 Androsace, 120, 207 



diffusa, 180 

 anemochores, 245 

 Anemone, 121, 207, 228, 242, 293 

 anemophilous flowers, 125, 126 

 anmials, in migration, 245 

 Antennaria, 159, 207, 227 

 anthotropism, 121 

 Apocynum androswmifolium, 145 

 Aquilegia cccrulca, 250 

 Arabfs fendleri, 157 

 AracecF, 120 

 Aragallus lambcrti, 207 

 Arctestaphylus uva-ursi, 119, 157 

 AriscEma, 120, 126 

 Aristida, 244 



305 



