436 



PLANT SOCIOLOGY 



Syngenetic classification, 334 



experiments, 328 



units, 320 

 Syngenetics, 203, 305 



development of, 2 



practical significance of, 327 

 Synusiae, 302 



relation of, to associations, 302 



T 



Tahellaria, 75 



Taeniophyllum zollingeri, 296 

 Talus communities, 44, 319 

 Tamarix, 192 



forest, 6 

 Taraxacum, 69, 310 

 Taxus, 339 



canadensis, 333, 334 

 Temperature, 83 



and humidity, 95 



and nitrogen content of soil, 248 



and periodicity, 91, 92 



control, Merriam's law of, 91, 93 



daily range of, in forest, 91 



decrease with altitude, 261 



extremes, effect of, 89 



graphs, 85, 91 



in forest, 90, 91 



injury from extremes, 86 



inversions, 87 



low, duration of, 86 



maxima, 85 



measurements, 83 



minima, 85 



monthly means, 94 



of air, influence of, upon vegetation, 

 89 



of soil, 221, 222, 223, 265 



relations, optimal, 89 



Scandinavian, 96 



Siberian winter, 87 



summations of, 91 



wind effect upon, 96 



zones, 93 

 Temperatures, minimum, distribution 



of, 86 

 Tertiary, relicts of, 187 



species, 62 

 Testudinaria, 296 



Tetragonolobus siliquosus, 193 

 Teucrium montanum, 186, 294 

 Thalictrum, 292 

 Thallotherophytes, 289 

 Thamnolia vermicularis, 72, 155, 292 

 Thelidium assn., 188 

 Thermal constants, 91 

 Thero-Brachypodietalia, 376 



-Brachypodion, 364, 376 

 Therophyte, cUmate, 299 



seres, 335 

 Therophytes, 289, 297 



as pioneers, 309 

 Thiophysa, 203 

 Thiothrix, 203 

 Thiovolum, 203 

 Thlaspeetalia, 373 

 Thlaspeetum, 44, 59, 319 



rotundifohi, 44, 183, 321 

 Thlaspeion rotundifolii, 319 

 Thlaspi, 44 



calaminare, 191 



rotundifoUum, 10, 44 

 Thrincia tuber osa, 50, 51 

 Thymus capitatus, 335 



serpyllum, 292 



vulgaris, 42, 130, 271, 276 



-Brachypodium distachyon stage, 



326 

 facies, 271 



zygis, 33 

 Tilia, 338, 339 



americana-Ostrya virginiana forest, 

 142 

 Timber lines, 157, 263 

 wind-induced, 158 

 {See also Tree limits) 

 Tolerance, for calcium, 184 



of plants, pH, 169 

 Tomillares, 272 

 Topographic arrangement of vegetation, 



345 

 Tortella inclinata, 209 



tortu^sa, 72 

 Tortula arenicola assn., 67 



ruralis, 67 



subulata, 69 

 Total estimate, of vegetation, 34 

 TotaUzer, for rainfall, 114 



