INDEX 



437 



Toxic effect of ions, 180 



Trailing shrubs, 294 



Trametes pint, 119 



Transects, 357 



Transpiration, diurnal range of, 138 



of shade plants, 127 



of sun plants, 127 



of xerophytes, 127 



rate of obligate halophytes, 192 



winter, 125 

 Transpiring power of plants, 128 

 Trapa, 339 

 Tree epiphytes, 296 



growth limits, 154, 263 



limits, alpine, 93, 157 

 in Swiss Alps, 262 



{See also Timber lines) 



seedlings related to soil, 314 

 Trees, wind form of, 146, 147 

 Trentepohlia, 188, 242, 291, 309 

 Tribulus ierrestris, 289, 374 

 Trichophoretum, 45 

 Trifidi-Distichetum, 61, 120, 156, 313, 



345, 365 

 Trifolion maritimi, 375 

 Trifolium alpinum, 365 



fragiferum, 364 



maritimum, 375 



nanum, 156 



repens, 292 



scabnim, 66 



thalii, 120 

 Triglochin maritimvm, 128 

 Trisetetum flavescentis, 48, 61, 62, 300 

 Trisetum distichophyUum, 44, 188 



flavescens, 61, 119 

 Trochiscia, 280 

 Trollius europaeus, 48 

 Tropical climax forest, 284 



rain forest, 367, 368 

 Tschernosem, 256 

 Tsuga canadensis, 102, 109 



light requirement of, 102 

 Tuber, 290 



Tubercle bacteria, 236 

 Tufa builders, 184 

 Tulipa silvestris, 91 

 Tundra, 38 



soil, 257 



Turf seres, 335 

 societies, 317 

 Turkestan, steppe vegetation of, 202 

 Tussilago farfara, 309 

 Tussock plants, 13, 291 

 Types of vegetation, 302 

 Typha minima, 36 



U 



Ubiquists, 59 

 Ulex, 112, 132, 280 

 Ulmus, 338 



scabra, 245 

 Ulota crispa, 16 

 Ulothrix, 347 



Ultra-violet radiations, 106 

 Ulva, 203 

 Umbilicus, 130, 292 



pendulinus, 74, 131 

 United States, N. S. Quotient map of, 

 144 



soil map of, 260 

 Units of plant sociology, 22 



of vegetation, 22 



smaller, of vegetation, 21, 24 

 Unsaturated humus, 163 

 Urococcus, 237 

 Urtica, 276 



dioca, 238 



pilulifera, 231 



soil, 238 

 Usneion, 371 

 Utricularia, 290 



Vaccinietum myrtilli, 136, 137 

 Vaccinium, 89, 108, 136, 239, 314 

 myrtillus, 45, 105, 120, 124, 225, 250, 

 253 

 -Betula pubescens forest, 174 

 heath, 280 

 uliginosum, 86, 124, 330 

 vitis idaea, 125, 245, 330 

 Valisneria, 374 

 Vancouver, climate of, 95 

 Vapor pressure, 132 



related to continental areas, 133 



