INDEX 



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



Abies, 648. 



Absciss layer, 582, 583. 



Absinthin, 626. 



Absorption, epiphytes, 014, 615; external 

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

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

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

 518; roots, 491, 493, 5/0, 511; transpi- 

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

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

 plants, 6oQ. 



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, QIZ, 9/3, 914, 915; leaves, 627, 

 628, 629, 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, 92 1; galls, 7^2 ; 

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

 section, 685; twigs, 646. 



Achene, 857, 919, 921, 924. 



Achillea, flowers, 846. 



Acorn, 919, 925. 



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, do/, 725. 



Advantage; advantageous reactions, 487, 

 488. 



Adventitious roots, 501, 502, 503, 510, 5/2, 

 5/4, 637, 668, 671, 673, 675, 730, 744. 



Aecidial stage; aecidiospores, 764, 813. 



Aeranthus, root, 5/2. 



Aeration, 551, 660. 



Aerenchyma, 553. 



Aerial rhizoids, 518. 



Aerial roots, 5/0, 511, 5/2, 513, 514, 575. 



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, 55*, 559; 

 chambers, 55/, 552, 553, 557, 561, 687, 

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

 pore, 557; reservoirs, 554 (see also Air 

 chambers) ; roots, 5/0, 511, 512, 5/3, 5/4, 

 5/5; spaces, 534, 55/, 552, 553, 554, 621. 



Albescence, 523, 524, 536. 



Albino, 845. 



Albugo, haustoria, 7*53. 



Alburnum, 685. 



Alder, buds, 938. 



Aleurone, 914, 9/5. 



Algae, absorption, 609, 610; asexual spores, 

 810; chlorenchyma, 533; conductive 

 tissues, 685 ; form variations, 591, 593 ; 

 lichens, #00, 801, 802 ; reproductive varia- 

 tion, 878, 881 ; rhizoids, 5/9, 520; sapro- 

 phytism, 756; sexual reproduction, 816, 

 817; vegetative reproduction, 806. 



Alkaloids, 626. 



Allium, bulbils, 003; flowers, 74; seed- 

 ling, 935- 



Alnus, buds, 938. 



Aloin, 626. 



Alpine plants, 590, 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, 500, 502, 593, 594, 505, 597- 



Amphigastria, 608. 



Amphimixis, 820. 



Amphivasal bundles, 683. 



Anaptychia, #00. 



Anastomosing veins, 638. 



Anatropous ovules, 906. 



Anchoring roots, 497, 498, 5/2, 5/3. 



Andromeda, leaf, 57$. 



Anemophilous flowers, 834. 



Angelica, bud protection, 641. 



Angiosperms (see also Seed plants), vessels, 

 68 1. 



Animals (see also Ants, Birds, Carnivorous 

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

 green-celled A., 803 ; parthenogenesis, 

 882; protection from, 743, 908; repro- 



