INDEX 



[Figures in italics indicate pages upon which illustrations occur.] 



Abies, 648. 



Absciss layer, 582, 583. 

 Absinthin, 626. 



Absorption, epiphytes, 614, 615; external 

 factors, 493; foods, 616, 752 ff., 934; 

 hairs, 613, 615, 617; land plants, 610; 

 leaves, 608, 6og, 613, 616; rhizoids, 517, 

 518; roots, 401, 493, 510, 511 ; transpi- 

 ration, 565; water and salts, 491, 493, 

 517, 518, 565, 608, 614, 615; water 

 plants, 6og. 



Abutilon, albescence, 524, 536. 



Acacia, thorns and food bodies, 754. 



Acceleration, period of, 690. 



Accommodation, 487, 760, 951. 



Accumulation, foods, 500, 627, 628, 719, 

 720, 911, gi2, Qi3, 014, 915; leaves, 627, 

 628,620,630,631, 632, 633; roots, 500; 

 seeds, 911, 912, 913, 914, 915; stems, 718, 

 719, 720, 721, 723, 724, 725; waste, 623, 

 624, 625, 626, 718, 723, 724, 725; water, 

 627, 628, 629, 630, 631, 632, 633, 718. 



Acer, flowers, 833; fruit, 921; galls, 782; 

 habit, 584 ; hairs, 572 ; leaves, 542 ; stem 

 section, 685; twigs, 646. 



Achene, 857, 919, 921, 924. 



Achillea, flowers, 846. 



Acorn, 919, 92$. 



Acquired characters, 947. 



Actinomorphic flowers, 825, 842, 859. 



Active buds, 936. 



Adapt ; adaptation ; adaptation characters ; 

 adaptive response, 487, 947, 949, 951. 



Adhesive disks, 652, 653. 



Adjustment, 487, 951. 



Adult stages, 596, 601, 725. 



Advantage; advantageous reactions, 487, 

 488. 



Adventitious roots, 507, 502, 503, 510, 512, 

 514, 637, 668, 671, 673, 675, 730, 744. 



Aecidial stage; aecidiospores, 764, 813. 



Aeranthus, root, 572. 



Aeration, 551, 660. 



Aerenchyma, 553. 



Aerial rhizoids, 518. 



Aerial roots, 510, 511, 512, 513, 514, 515. 



Aerial stems, 719, 725. 



Agave, bast fibers, 696; epidermis, 568; 

 habit, 628 ; palisade cells, 551. 



Agelaea, 656. 



Aggregate fruit, 924. 



Air cavities, stomatal, 555, 556, 558, 559; 

 chambers, 551, 552, 553, 557, 561, 687, 

 688, 703, 718 ; leaves, 590, 592, 593, 595; 

 pore, 557; reservoirs, 554 (see also Air 

 chambers) ; roots, 510, 511, 512, 513, 514, 

 515; spaces, 534, 551, 552, 553, 554, 621. 



Albescence, 523, 524, 536. 



Albino, 845. 



Albugo, haustoria, 763. 



Alburnum, 685. 



Alder, buds, 938. 



Aleurone, 914, 913. 



Algae, absorption, 609, 610; asexual spores, 

 810; chlorenchyma, 533; conductive 

 tissues, 685; form variations, 591, 593; 

 lichens, 800, 801, 802 ; reproductive varia- 

 tion, 878, 881 ; rhizoids, 519, 520; sapro- 

 phytism, 756; sexual reproduction, 816, 

 817; vegetative reproduction, 806. 



Alkaloids, 626. 



Allium, bulbils, 903; flowers, 874; seed- 

 ling, 935. 



Alnus, buds, 938. 



Aloin, 626. 



Alpine plants, 599, 648, 730, 731, 732, 738, 

 890, 944. 



Alternation of generations, 814, 822. 



Alternative parasitism, 787. 



Ammophila, leaf section, 581. 



Amphibious plants, hairs, 574, 575; leaf 

 variation, 590, 592, 593, 594, 505, 597- 



Amphigastria, 608. 



Amphimixis, 820. 



Amphivasal bundles, 683. 



Anaptychia, 800. 



Anastomosing veins, 638. 



Anatropous ovules, 906. 



Anchoring roots, 497, 498, 512, 513. 



Andromeda, leaf, 578. 



Anemophilous flowers, 834. 



Angelica, bud protection, 641. 



Angiosperms (see also Seed plants), vessels, 

 681. 



Animals (see also Ants, Birds, Carnivorous 

 plants, Galls, Insects), dispersal by, 923; 

 green-celled A., 803; parthenogenesis, 

 882; protection from, 743, 908; repro- 



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