INDEX 



(References to illustrations are indicated by asterisks accompanying page numbers) 



Absorption, mechanism of, 137 



Absorption by roots, 139 



Acaulescent, 353 



Accessory buds, 356 



Acer saccharum, 88*, 390*, 391* 



Aceraceae, 390, 393 



Achene, 364, 365, 412* 



AchiUea, flower of, 411*, 412* 



Achillea (yarrow), 411* 



Acorn, 385* 



Acuminate leaf apex, 355* 



Acute leaf apex, 355* 



Adiantum, embryo of, 309* 



Adiantum, gametophyte of, 309* 



Adiantum (maidenhair fern), 297*, 



299*, 300*, 301* 

 Adjustments, summary of, 44 

 Adjustments of American elm, 43* 

 Adjustments of bean leaves, 28*, 29* 

 Adjustments of caladium, 38* 

 Adjustments of clover, 39*, 40* 

 Adjustments of common plants, 37 

 Adjustments of corn roots, 32*, 33*, 



34* 



Adjustments of dandelion, 41* 

 Adjustments to environment, 23-45 

 Adjustments of garden pea, 24* 

 Adjustments of nasturtium, 26* 

 Adjustments of plant body, 14 

 Adventitious buds, 356* 

 Adventitious roots, 357 

 ^Eciospores (secidiospores), 274, 275* 

 Aerial roots, 357 

 Aerobic, 249 



Aggregate fruit, 364*, 365, 405* 

 Air spaces of leaf, 115 

 Alder, stem structure of, 91*, 92*, 93* 

 Alfalfa, roots of, 112 

 Algae, 219-241 



Algae, life histories of, 228, 229 

 Alismaceae, 428-430 

 Alnits, stem structure of 92*, 93* 

 Alnus mollis, stem sections of, 91* 

 Alternation of generations, 292*, 311* 

 Amanita muscaria, 267 

 Ambrosia, 19 



American crab, 408* 



Anaerobic, 249 



Anaphase, 75*, 77 



Anatomy, 213 



Anatropous ovule, 363 



Anatropous ovule of Ins, 347* 



Anemophilous, 361 



Angiosperms, 337 



Angiosperms, trees of, 380 



Animate environment, 7 



Annual bean plant, physiology of, 127* 



Annual bean plant, seasonal history of, 



126-130, 129* 



Annual bean plant, summary, 130 

 Annual ring, 85* 



Annulus of fern sporangium, 306* 

 Annulus of mushroom, 268*, 269 

 Anther, 162* 



Anther, structure of, 343* 

 Anther and sporophylls, 341* 

 Antheridium, 288, 289 

 Antheridium of Ricciocarpus, 231* 

 Anthracnose, 282 

 Antipodals, 164, 165* 

 Antitoxins, 256 

 Apogeotropic, 20*, 30 

 Apophototropic, 30 

 Apotropic, 30 



Apple, flower and fruit of, 409 

 Apple tree, body plan of, 15*, 16* 

 Aquilegia (columbine), 399* 

 Araceae, 425, 426* 

 Archegonium, 289* 

 Archegonium of Ricciocarpus, 289* 

 Arisaema, 426* 

 Ascent of water, 144, 146 

 Ascent of water, path of, 141* 

 Asci of lichen, 278*, 280 

 Asdepias, leaf structure of, 113*, 115* 

 Ascophyllum, habit of, 236* 

 Aspergillus, 266* 

 Aspidium, fern, 307* 

 Assimilation, 125 

 Assimilation of bean plant, 129 

 Associations, origin of, 436 

 Associations, plant, 435, 445 



447 



