INDEX 



816, 817, 819 ; asexual, 8og, 810, 811, 812, 

 813, 814, 815; leaf, 636, 637; root, 505; 

 sexual, 816, 817, 819; stem, 667, 668, 

 669, 670, 671, 672, 673, 674, 675, 676, 

 677, 678; vegetative, 505, 509, 516, 591, 

 636, 637, 667, 805, 806, 807, 808, 809, 

 (see also Reproduction, stem). 



Reproductive organs, 488, 666, 667, 809 fi. ; 

 periods, 885, 890; variation, 878, 884, 

 885, 890, 893. 



Reserve cellulose, 913; food, 487, 718. 



Resin, 571, 622, 624, 723. 



Respiration, 563. 



Response, 487 ; adaptive, 947, 949. 



Resting buds, 936, 938. 



Restitution, 748. 



Resurrection plant, 581. 



Retardation, period of, 600. 



Reticulated vessel, 680. 



Reversal of polarity, 750, 751. 



Reversibility of stage, 893. 



Revolute leaves, 578; vernation, 937. 



Rhipsalis, chloroplast, 522. 



Rhizine, 520. 



Rhizobium, 787. 



Rhizoid, 516, 517, 518, 519, 520, 750; 

 aerial, 518; peg, 516; plane, 516. 



Rhizome, 667, 668, 669, 670, 671, 674, 744; 

 climber, 653, 654; colony, 671; section, 



703- 



Rhizophora, roots, 515; vivipary, 930, 931. 



Rhizophore, 512, 516, 608. 



Rhodites, gall, 783. 



Rhythm, 737. 



Ribes, leaf veins, 639. 



Riccia, rhizoids, 516, 517. 



Ricinus, endosperm, 914. 



Ridge, stomatal, 555, 556, 558, 562, 574. 



Ring, annual, 685, 689, 690, 691 ; cam- 

 bium, 684, ' fairy, 807; growth, 685, 689, 

 912. 



Rock plants, 945. 



Role, 487. 



Root, 488, 489, 491, 492, 494, 496, 497, 498, 

 499, 500, 501, 502, 503, 504, 505, 506, 

 509, 510, 511, 5/2, 513, 5/4, 5/5, 520; 

 absorption, 491, 493, 510, 511; adventi- 

 tious, 5o/,\5O2, 503, 510, 5/2, 5/4, 637, 

 668, 671, 673, 675, 730, 744; air, 5/0, 

 5//, 5/2, 5/jj 5/4,5/5; anchor, 407, 498, 

 5/2, 513; cap, 497; chlorophyll, 511, 

 512; climbi ig, 5/2, 513, 653; contrac- 

 tion, 504, 5(5; correlation, 509; dura- 

 tion, 501; epcretion, 493; fleshy, 500; 

 food accumulation, 500; fungi, 791, 792, 

 793, 794, 796; hairs, 491, 492, 493, 494, 



495, 496, 512, 513; nutritive, 497, 513; 

 plank, 509; pocket, 510; primary, 491, 



496, 498, 500; prohydrotropism, 499; 



prop, 514, 5/5; propagation, 502, 503, 

 505; regeneration, 503 ; secondary, 496, 

 498; soil, 491, 492, 496, 497, 498, 500, 

 501 ; tap, 496, 677; tubercles, 787, 788, 

 790; variation, 505, 506, 507, 508, 513; 

 water, 509, 510, 610. 



Root-forming substances, 750. 



Rootstock, 667, 668, 669, 670, 671, 674. 



Rosa; rose, galls, 783; prickles, 742. 



Rosette, 5^2, 7/4, 726; tree, 645. 



Rosin-weed, pollen, 830. 



Rubber plant, roots, 502; stoma, 55$. 



Ruderal, 946. 



Runner, 672, 673. 



Run-off, 636. 



Rush, diaphragms, 552; mechanical cylin- '\ 



der, 699; rhizome, 670, 674; rhizome 

 section, 705. 



Russian thistle, leaf section, 630. 



Rust, wheat, 813. 



Sabal, 645, 653. 



Sac, embryo, 826; latex, 720; pollen, 

 830. 



Saccharose, 914. 



Sagittaria, leaf variation, 590. 



Salicin, 724. 



Salicornia, palisades, 536. 



Salix, epidermis, 570; habit, 5^4; polarity, 

 749; roots, 503. 



Salsola, leaf section, 630. 



Salt gland, 613, 621; marsh plants, 486, 

 537, 632, 942. 



Salts, 523, 565. t 



Salvia, pollination, 840. 



Salvinia, 609. 



Samara, 921. 



Sambucus, lenticel, 661. 



Sand-binder, 497, 499. 



Sand plants, 729, 750, 945 ; reed, leaf sec- 

 tion, 581. 



Sansevieria, leaf cutting, 637. 



Saprolegnia, sexuality, 883. 



SapropJiyte.; saprophytism, 752, 754, 75^, ' 

 7S6, 757, -758,^759. 76o; distribution, 

 76<J; facultative, 762 ; obligate, 762 ; 

 partial, 754 ; progressive variability, 759 ; 

 symbiotic, 757, 798. 



Sap wood, 685. 



Sarracenia, leaf, 618. 



Satureja, 67 3. 



Saxifraga ; Saxifrage, flowers, 853. 



Scabrous hairs, 573. 



Scalariform vessel, 679, 680. 



Scale, 835, 925; bud, 642, 643, 644, 646, 

 833; hair, 573, 615; leaf, 572, 641, 642 

 643, 644, 669, 670, 675, 733, 736, 768, 

 834; ventral. 516, 517. 



Scape, 59f 837. 



