INDEX 



309 



gregarious, 205 

 Grindelia, 159 



squarrosa, 158 

 growth, 4, 106 



amount and rate, 108 



conditions that influence, 108 



in migration, 246 



of tissues and organs, 106 



regions of greatest growth, 109 



rhythm of, 110 



zone of division, 110 



zone of elongation, 110 



zones due to, 295 

 guard-cells, 52 



movements of, 61 

 Gyrostachys stricta, 175, 184 



Haberlandt, on transpiration, 67 

 habitat, adjustment to, 265 



effect on ecesis, 264 



reactions of plants upon, 282 



relation between formationand,218 



study, method of, 30 

 habitat-form, 155, 265 



influence on competition, 256 

 habitats, 232 



classification by, 231 

 hairs, 57, 148, 175 

 Hales, on transpiration, 67 

 halophytes, 156 



Helianthus, 159, 163, 165, 182, 227, 

 242, 261 



annuU'S, 182 



pumilus, 176 

 heliophytes, 183 

 heliotropic plants, 88 

 Helleborus, 62 

 hemeranthous flowers, 130 

 Henslow, on adaptation, 190, 192 

 heterotrophic plants, 104 

 Heuchera, 217 

 Hibiscus trionum, 31 

 Hippurus, 167 



vulgaris, 167 

 historical factor in vegetation, 219 

 Holacantha, 164 

 holard, 9, 14, 16 

 holophytes, 104 

 homogamous flowers, 122 

 hooked disseminules, 243 

 Hordeum, 229 

 hour readings, 33 

 humic acids, 169 

 humidity, 7, 24, 63 



effect of climate and habitation, 27 



influence of pressure and physiog- 

 raphy on, 26 



influence of temperature and wind , 

 25 



measurement, 27 



humidity readings, 29 



tables, 30 

 humus, 20 



hybridation, origin by, 197 

 hybridization, 124 

 hydrochores, 245 

 hydrophilous flowers, 125 

 hydrophytes, 155, 165 

 hydrophytic formations, 232 

 hydrotropism, 43, 44 

 hygroscopic fruits, 247 

 hysterophytes, 104 



nutrition of, 104 



imbibition, 44, 45 



Impatiens, 126, 247, 265 



increase of water supply, 151 



indefinite variations, 189 



indehiscent dry fruits, 132 



indigenous, 268, 273 



mdirect factors, 5 



msectivorous plants, digestion m, 99 



invasion, 270 



at different levels, 272 



complete, 272 



continuous, 272 



intermittent, 272 



kinds of, 272 



manner of, 270 



partial, 273 



permanent, 273 



temporary, 273 

 invertase, 100 

 Ipomoea, 121 

 Iris, 120, 226 

 iron, 79 

 isolation, 199 

 isophotic leaves, 174, 182 



Juncus, 161, 162, 163 



Koelera, 226, 293 

 Kuhnistera, 227 

 Kuhnia glutinosa, 213 



Laciniaria, 227, 228 

 Lactuca, 242 



scariola, 145 

 Lamarck, on evolution, 188, 192 

 Lanate leaves, 159, 175 

 law of competition, 254, 255 



of evolution, 185 



of simple aggregation, 239 

 laws of succession, 284 

 layers 229 



leaf position, decrease of water loss 

 through, 145 



print, 78, 178 



structure, 56 



xerophytes, normal, 157 



