INDEX 



8i6, 8iT, 819 ; asexual, 8og, Sio, 811, 812, 

 813, 814, 815; leaf, 636, 637 ; root, $05! 

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

 66q, 670, 671, 672, 673, 674, 675, 676, 

 677, 678; vegetative, $05, soQ, 516, 5QI, 

 636, 637, 667, 80s, 806, 807, 808, 809, 

 (566 cdso Reproduction, stem). 



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

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

 885, 890, 893. 



Reserve cellulose, Q13; 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, 690. 



Reticulated vessel, 680. 



Reversal of polarity, 730, 751. 



Reversibility of stage, 8Q3, 



Revolute leaves, $7^! vernation, 937. 



Rhipsalis, chloroplast, 522. 



Rhizine, 520. 



Rhizobium, 787. 



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

 aerial, j/S; peg, 516; plane, 516. 



Rhizome, 667, 668, 66g, 670, 671, 674, 744; 

 climber, 6 S3, 654; colony, 671; section, 

 703- 



Rhizophora, roots, 515; vivipary, 930, 951. 



Rhizophore, s^2, 516, 608. 



Rhodites, gall, 783. 



Rhythm, 737. 



Ribes, leaf veins, 63Q. 



Riccia, rhizoids, 516, 517. 



Ricinus, endosperm, Q14. 



Ridge, stomatal, 555, 556, SS^, 562, 574- 



Ring, annual, 68$, 689, 6qo, 691 ; cam- 

 bium, 684 ; fairy, 807 ; growth, 68$, 689, 

 pi2. 



Rock plants, 94s. 



Role, 487. 



Root, 488, 489, 491, 402, 404, 496, 407, 40^, 

 409, 500, SOI, S02, S03, S04. 505, 506, 

 Soo, SIO, 511, 512, 513, S14, S15, 520; 

 absorption, 491, 493, sio, sn! adventi- 

 tious, SOI, S02, 503, SIO, 512, 514, 637, 

 668, 671, 673, 675, 730, 744; air, 510, 

 SI I, $12, $13, $14, 51 s; anchor, 497, 498, 

 $12, $13; cap, 497 ; chlorophyll, $11, 

 SI 2; climbing, $12, $13, 6;$', contrac- 

 tion, $04, $0$; correlation, S09; dura- 

 tion, SOI ; excretion, 493 ; fleshy, $00; 

 food accumulation, $00; fungi, 791, 792, 

 793, 794> 796; hairs, 401, 49^, 493, 494, 



495, 496, $12, S13; nutritive, 497, $13; 

 plank, S09; pocket, $10; primary, 491, 



496, 498, $00; prohydrotropism, 499; 



prop, $14, $1$; propagation, $02, S03, 

 $0$; regeneration, S03 ; secondary, 496, 

 498; soil, 491, 492, 496, 497, 498, $00, 

 $01 ; tap, 496, 677; tubercles, 787, 788, 

 790 ; variation, soS. $06, 507, so8, $13; 

 water, $09, $10, 610. 



Root-forming substances, 7So. 



Rootstock, 667, 668, 66g, 670, 671, 674. 



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



Rosette, $82, 714, 726; tree, 64$. 



Rosin-weed, pollen, 830. 



Rubber plant, roots, $02; stoma, $$8. 



Ruderal, 946. 



Runner, 672, 673. 



Run-off, 636. 



Rush, diaphragms, $$2; mechanical cylin- 

 der, 699; rhizome, 670, 674; rhizome 

 section, 703. 



Russian thistle, leaf section, 630. 



Rust, wheat, 813, 



Sabal, 64$, 6$3. 



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

 830. 



Saccharose, 914. 



Sagittaria, leaf variation, $90. 



Salicin, 724. 



Salicornia, palisades, $36. 



Salix, epidermis, 570 ,' habit, 5S4; polarity, 

 749; roots, $03. 



Salsola, leaf section, 630. 



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

 S37, 632, 942. 



Salts, 523, s6S- 



Salvia, pollination, 840. 



Salvinia, 609. 



Samara, 921. 



Sambucus, lenticel, 661. 



Sand-binder, 497, 499. 



Sand plants, 729, 730, 945 ; reed, leaf sec- 

 tion, $81. 



Sansevieria, leaf cutting, 637. 



Saprolegnia, sexuality, 883. 



Saprophyte; saprophytism, 7S2, 734, 7$$, 

 756. 7S7> 758, 7S9i 760; distribution, 

 760; facultative, 762; obligate, 762; 

 partial, 754 ; progressive variability, 7S9 ; 

 symbiotic, 7S7, 798. 



Sap wood, 685. 



Sarracenia, leaf, 618. 



Satureja, 673. 



Saxifraga; Saxifrage, flowers, 8$3. 



Scabrous hairs, S73- 



Scalariform vessel, 679, 58o. 



Scale, 835, 92$; bud, 642, 643, 644, 646, 

 833; hair, $73, 61$; leaf, $72, 641, 642 

 643, 644, 669, 670, 67$, 733, 736, 768, 

 834; ventral, 516, $17. 



Scape, $99, 837. 



