INDEX 



Scar, leaf, 583, 644, 657, 660, 708, 736; 

 stem, 671. 



Schistostega, phyllotaxy, 540. 



Schizocarp, 919, 924. 



Scion, 776. 777, 778. 



Scirpus, 665. 



Sclereid, 630, 697, 698. 



Sclerenchyma, 697, 698, 724, 782. 



Sclerophyll, 570, 585, 639, 709. 



Sclerosis, 698. 



Sclerotic cells, 513. 



Sclerotium, 808. 



Scouring rush, 733. 



Scrophularia, flowers, 853. 



Scutellaria, rhizome, 744. 



Scutellum, 786, 934. 



Secondary conductive tissue, 684, 685, 689 ; 

 phloem, 684; roots, 496, 498; wood, 

 684, 685, 689, 690; xylem, 684, 685. 



Secretion; secretory cells, 617, 620, 622, 

 623, 624, 623, 626, 724, 843, 844, 858. 



Seed, 904, 905, 906, 907, 908, 911, 915, 916, 

 917, 918, 919, 920, 928; coat, 905, 909, 

 9I5> 932; death, 910; dispersal, 919; 

 food accumulation, 911; germination, 

 93O, 931 ; protection, 906, 907, 908; sec- 

 tion, 905, 913, 915; vitality, 908, 923. 



Seedless plants, reproduction, 805 (see also 

 Algae, Bacteria, Fungi, Lichens, Liver- 

 worts, Mosses, Pteridophytes). 



Seedling, 491, 492, 494, 499, 506, 934, 935, 

 936. 



Seed plants, leaf reproduction, 637; para- 

 sitism, 769, 775; reproductive variation, 

 885 ; saprophytism, 757 (see also 

 Dicotyls, Monocotyls, etc.). 



Selaginella, chloroplasts, 521; conductive 

 bundle, 683; habit, 608; rhizophore, 

 5/2, 516. 



Selection, natural, 743, 876, 952. 



Self-parasitism, 786. 



Self-pollination, 829, 863. 



Self-pruning, 726. 



Sempervivum, reproductive variation, 900 ; 

 stem variation, 726. 



Senecio, habit, 541; hairs, 573; leaf sec- 

 tion, 631 ; leaves, 629. 



Sensitive plant, leaves, 579. 



Sepal, 825, 826, 859. 



Sepalody, 902. 



Separation layer, 709. 



Seta, 667. 



Sex determination, 895. 



Sexuality, fungi, 883; origin, 881. 



Sexual reproduction, 816, 817, 819. 



Shade plants, chlorenchyma, 530, 531, 535. 



Sheath, bundle, 530, 581, 639, 683 ; paren- 

 chyma, 683 ; phloem, 683 ; protective, 

 617, 683 ; starch, 683. 



Shield-budding, 777. 



Shoot-forming substances, 750. 



Shrubs, 646, 650, 717. 



Sieve plate, 681, 682 ; tube, 681, 694. 



Signal theory, 847. 



Silene, pollination, 859. 



Silky hairs, 572. 



Silphium, pollen, 830. 



Simple leaves, 605. 



Single flowers, 902. 



Sinistrorse twiners, 651, 656, 768. 



Sinus, leaf, 637, 639. 



Sleep movements, $79. 



Slime gland, 561, 623. 



Slit, stomatal, 555, 556, 562, 571. 



Small leaves, 550. 



Smilacina, rhizome, 668. 



Snow protection, 588. 



Soil exhaustion, 493 ; roots, 491, 492, 496, 



497, 498, 500, 501; toxins, 494. 

 Solanin, 626. 

 Solanum, pollen, 831 ; stamen, 830 ; stz rch, 



912; tuber, 674, 720; variation, 727. 

 Solidago, galls, 784. 

 Solomon's seal, rhizome, 671. 

 Soredia, 801. 

 Sorus, 636, 815. 

 Spadix, 860. 

 Sparganium, 545. 

 Spartina, rhizomes, 669. 

 Spasmodic habit, 737, 887. 

 Spathe, 837, 838, 860, 874, 903. 

 Special creation, 947. 

 Specialization, 765. 

 Sperm, 816, 817. 



Sphagnum, cells, 612; habit, 666. 

 Spherite, 914. 

 Spherocrystal, 913, 914. 

 Spike, 828, 835, 837. 

 Spikelet, 835. 

 Spikenard, wild, 546. 

 Spine ; spinescence, 604, 72$, 739, 740, 741, 



742, 743. 



Spiral thickening, 612; vessel, 680, 68 1. 

 Spiranthes, mycorhiza, 793. 

 Spirodela, 509. 

 Sponge tissue, 530, 533, 534, 535, 536, ;,6i t 



567, 574, 642, 781. 

 Sporangium, 755, 809, 811, 815. 

 Spore, asexual, 809, 810, 811, 813, 814, Hi 5. 

 Sporeling, 814. 

 Sporocarp, 816. 

 Sporophore, 755. 

 Sporophyte, 666, 814. 

 Springwood, 689, 690. 

 Spruce, 648 ; Douglas, 735. 

 Spur, 840, 843, 844. 

 Stamen, 825, 826, 828, 829, 830, 833, 835, 



846, 851, 853, 854, 871, 874. 



