INDEX 



Vervain, hairs, 623. 



Vessels, d^g, 680, 68 r; annular, 680, 68 1; 



latex, 72 J,- pitted, 65i; reticulated, 680 ; 



scalariform, 679, 680 ; spiral, 680, 681. 

 Vestibule, SSS, SS6, 574- 

 Viburnum, leaf gall, 781; shoots, 644. 

 Vicia, root hairs, 4(i[. 

 Viola ; violet, leaf section, SJO- 

 Virginia creeper, pendulous stem, 657. 

 Vitalism, g48. 

 Vitality, seed, qo8, 923. 

 Vitis, gall, S76; habit, 6sS- 

 Vivipary, 930, pjr. 



Wall, dorsal, S55, S56, 558, 562; ventral, 

 555, SS6, 562. 



Wandering Jew, crystals, 625. 



Wasp, fig, 861. 



Waste, accumulation of, 623, 624, 625, 626, 

 718, 723, 724, 72s. 



Water, 565 ; absorption, 491, 493, 317, S18, 

 565, 608, 6i4j 615; accumulation, 627, 

 628, 62Q, 630, 631, 632, 633, 718; calyx, 

 845: dispersal, Q 2 2, 926; exudation, 620, 

 622 ; hyacinth, 510; leaf form and, 599; 

 leaves, sgo, sq2, ^93, sqs, 837; lenticels, 

 663; lily, 540, 5(5r,- net, 810; parasites, 

 762, 771 ; plants, (5op, 676, 678 (see also 

 Hydrophytes) ; pollination, 837 ; reten- 

 tion, 627: roots, 30P, 510, 610; roots 

 and, 499, 50^, 503, 504, 505, 506 ; shield, 

 623; stem elongation and, 727 ; stomata, 

 620, 621; synthesis and, 527; tissue, 

 533, 62Q, 630, 631, 632; vascular de- 

 velopment and, 686. 



Waterweed, vascular bundle, 687. 



Wax, 368, 370; plant, 697. 



Wheat, grain section, gi5; root hairs, 492 ,• 

 rust, 813. 



Willow, epidermis, 570; habit, 584; 

 polarity, 749; roots, 503. 



Wind dispersal, 920, 926; pollination, 833, 

 834, 835, 837. 838. 



Winged fruits, g2i. 



Winter bud, 555, S7^, 646, 678, 736, 936, 

 938. 



Witches' brooms, 783. 



Withered leaves, 581. 



Wolffia, 678. 



Wood, autumn, 689, 6go; fibers, 697; 

 secondary, 684, 685, 689, 6go; spring, 

 689, 6go; waste accumulation in, 725. 



Woolly hairs, 572, 573, 574. 



Wound cork, 707. 



Xanthic colors, 845. 



Xanthium, fruit, g24; fruit section, 932. 



Xanthophyll, 522. 



Xenogamy, 829 {see also Cross pollination). 



Xerophile, 487. 



Xerophytes, 486, 939, 943 ; absorption, 

 613 ; associations, 943, 944 ; bog, 486, 

 537,942; chlorenchyma, 532, 5JJ,' con- 

 genital, 951 ; cutinization, 568 : dwarfs, 

 733; facultative, 951 ; leaf sections, 5jj, 

 535, 567, 581, 598, 62g, 630, 631, 63g, 

 724; leaves, 570, 378; obligate, 951; 

 reaction, 951 ; roots, 505, 506, 507 ; salt 

 marsh, 486, 942 ; stomata, 557, 338, s6i ; 

 succulence, 627, 628, 62g, 630, 631, 63s; 

 wax coats, 570. 



Xylem, 530, 630, 680, 682, 683, 684, 685; 

 secondary, 684, 685. 



Xylocentric bundles, 683. 



Yarrow, flowers, 846. 



Yucca, flowers, 871; habit, 388; pollina- 

 tion, 864. 



Zea, prohydrotropism, 



514; roots. 494. 

 Zebrina, crystals, 623. 

 Zoogloea, 787. 

 Zoospores, 810, 817. 

 Zygadenus, roots, 505. 

 Zygomorphy, 841, 843, 

 Zygospore, 816. 



4gg; prop roots. 



846, 853, 859. 



