INDEX 



Gourd, sieve plates, 68 1. 



Graft hybrids, 779. 



Grafting, 776, 777. 



Grain, 919 ; pollen, 826, 830, 831, 834. 



Grape, gall, 576; habit, 655. 



Grass, flowers, 835; foliage, 544, 650; leaf 



section, 531 ; rhizome, 669; stoma, 556. 

 Grasslike foliage, 544, 545. 

 Gravity, 499; pollination, 863. 

 Green-celled animals, 803. 

 Greening, 902. 



Growth ring, 685, 689, 690, 691, Qi2. 

 Guard cell, 555, 556, 558, 550, 562, 571, 621, 



724. 



Gutter point, 636. 

 Gymnosperm tracheids, 680. 



Hackberry, leaves, 607. 



Hadrocentric bundle, 683. 



Hadrome, 530, 630, 638, 682, 683, 692. 



Hairs, absorptive, 609, 615, 617 ; capitate, 

 623; digestive, 617; glandular, 617, 622, 

 623, 625; nutritive, 782; protective, 

 536, 567, 572, 573, 574, 575, 57$, 577, 

 578, 623, 661, 781, 858; root, 4Qi, 4Q2, 

 493, 494, 495, 496, 512, 513; stinging, 



577- 



Halophytes, 537, 632, 942. 

 Haptera, 519, 520. 

 Harebell, leaf section, 598; leaf variation, 



598, 600, 601, 602. 



Haustorium, 763, 768, 769, 771, 772. 

 Hawthorn, 655; root propagation, 505; 



spines, 739. 

 Hazel, flowers, 834. 

 Head, 599, 828, 846, 872. 

 Heart- wood, 685. 



Helianthemum, leaf variation, 731. 

 Heliophobe, 487. 

 Helleborus, stoma, 562. 

 Helotism, 787, 802. 

 Hemicellulose, 719, 913. 

 Hemi-epiphyte, 659. 

 Hemlock, dwarfed, 732. 

 Herb, 646, 650, 712, 713, 714, 715, 716. 

 Hermaphroditic plants, 818. 

 Heterocyst, 806. 



Heteroecious parasites, 764, 767. 

 Heterogamy, 817. 

 Heterophyte, 752. 

 Heterospory, 815, 819. 

 Heterostyly, 854. 

 Heterotrophic plants, 752. 

 Hexarch bundles, 683. 

 Hibernaculum, 678. 

 Hibiscus, pollen, 831 ; stigma, 831. 

 Hilum, 919. 



Hinge, stomatal, 556, 558, 562. 

 Holdfast, 519. 



Holly, leaf, 570. 



Holoparasite, 761, 770. 



Holosaprophyte, 754. 



Homogamy, 852. 



Homospory, 814. 



Honey dew, 813. 



Honeysuckle, leaves, 543. 



Hook climber, 654. 



Hop, barbs, 654. 



Hop tree, crystals, 625; fruit, 921; vas- 

 cular bundle, 639. 



Horizontal leaves, 539, 540. 



Hormogonia, 806. 



Hornwort, leaf section, 688. 



Host, 752, 769, 780; bridging, 765, 766. 



Hoya, sclereid, 697. 



Humulus, barbs, 654. 



Husk, 915. 



Hyacinth; Hyacinthus, bulb, 675; water, 

 5X0. 



Hybrid, 904; graft, 779. 



Hybridization, 904. 



Hydathode, 620, 62 1, 622. 



Hydrocotyle, 507. 



Hydrodictyon, zoospore, 810. 



Hydroid, 679. 



Hydrome, 682. 



Hydrophile, 487. 



Hydrophytes, 486, 715, 719, 728, 939, 940, 

 941; absorption, 609; chlorenchyma, 

 530,531,534; congenital, 951; faculta- 

 tive, 951 ; leaf sections, 531, 534, 561, 

 688; obligate, 951; pollination, 837, 

 838; reaction, 951; roots, 509; stem 

 reproduction, 676, 678; stomata, 559, 

 560, 561, 564. 



Hydrotropism, 499. 



Hymenium, 800. 



Hyperchimera, 780. 



Hyperplasy, 781. 



Hypertrophy, 633, 781. 



Hyphae, 755, 763. 



Hypocotyl, 906. 



Hypodermis, 705, 724. 



Hypogaean germination, 492, 494, 936. 



Hypogynous flowers, 825, 826, 828, 843, 

 851- 



Hyponasty, 582. 



Hypoplasy, 782. 



Idioblast, 682. 



Ilex, leaf, 570. 



Immunity, 768. 



Impatiens, pollen, 831. 



Impotent pollen, 854. 



Inbreeding, 867. 



Indehiscent fruit, 919. * 



Independent plants, 752. 



Indeterminate inflorescence, 828, 82g. 



g 



