INDEX 



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

 stem, 671. 



Schistostega, phyllotaxy, 549. 



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, 625, 626, 724, 843, 844, 858. 



Seed, 904, 905, 906, 907, 908, 911, 9/5, 916, 

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

 9/5, 932; death, 910; dispersal, 919; 

 food accumulation, 911; germination, 

 93. 93 ! ; 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, 955, 

 936. 



Seed plants, leaf reproduction, 637 ; para- 

 sitism, 769, 775 ; reproductive variation, 

 885 ; saprophytism, 757 (see also 

 Dicotyls, Monocotyls, etc.). 



Selaginella, chloroplasts, 52 1; conductive 

 bundle, 68 3; habit, 608; rhizophore, 

 512, 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, 579. 



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; starch, 



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, #74, 905. 

 Special creation, 947. 

 Specialization, 765. 

 Sperm, 816, 817. 



Sphagnum, cells, 612; habit, 666. 

 Spherite, 9/4. 

 Spherocrystal, 913, 9/4. 

 Spike, 828, 835, 837. 

 Spikelet, 835. 

 Spikenard, wild, 546. 

 Spine ; spinescence, 604, 725, 739, 740, 741, 



742, 743- 



Spiral thickening, 612; vessel, 680, 681. 

 Spiranthes, mycorhiza, 795. 

 Spirodela, 509. 

 Sponge tissue, 530, 533, 534, 535, 536, 561, 



567, 574. 642, 78 r. 

 Sporangium, 755, 809, 811, 815. 

 Spore, asexual, 809, 810, 8n, 813, 814, 815. 

 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. 



