INDEX 



Dianthus, mechanical cylinder, joi ; stoma, 



Diaphototropism, 539, 540, 542, 544, 546, 



547- 

 Diaphragm, 552. 

 Dichogamy, 818, 836, 852. 

 Dicliny, 827, 856. 

 Dicotyls, chlorenchyma, 530; seedling, 036 



(see also Seed plants). 

 Differentiation, 488. 

 Digestion, 934. 

 Digestive hairs, 617. 

 Digitalin, 626. 



Dioecious plants, 818, 827, 833, 895. 

 Diospyros, endosperm, Q13. 

 Disease resistance, 768. 

 Disk, adhesive, 652, 653; flowers, 846. 

 Dispersal, 805, 919, 920, 922, 923, 925. 

 Display, stem, S42, 543, 546, S48, 645, 646, 



648, 649, 650, 666, 667. 

 Disseminule, 805. 

 Distichous phyllotaxy, 510, S40- 

 Disuse, 948. 



Divided leaves, S44, 546, 550. 

 Dodder, habit, 768; haustoria, 769. 

 Dogwood, stem, 730. 

 Domatia, 753. 



Dorsal walls, 555, 556, 558, 562. 

 Dorsiventral symmetry, 489, 629, 630. 

 Double flowers, 901, go2. 

 Douglas spruce, 735. 

 Dripping point, 636. 

 Dropper, 505, 675. 

 Drosera, digestive hairs, 616, 617. 

 Drupe, 919. 

 Duckweed, vegetative reproduction, 678; 



water roots, 5og. 

 Ducts, conductive, 679, 680, 681; resin, 



723, 724- 

 Dune plants, 72^, 730. 

 Duramen, 685, 725. 

 Duration, flowers, 870; leaves, 582; roots, 



501; stems, 717. 

 Dwarf; dwarfing, 730, 731, 732, 733, 734. 

 Dyes, 723. 



Earth star, 812. 

 Echinocactus, 740. 

 Echinocystis, tendrils, 652. 

 Ecological variation, 486. 

 Ecology, 48s. 

 Ectoparasite, 763. 

 Ectotrophic mycorhiza, 791, 7Q2. 

 Edema, 633. 

 Egg, 816, 817, 827. 

 Eichhornia, root, 510. 

 Elaeagnus, hairs, 573. 

 Elaioplast, 721. 

 Elater, 814. 



Elder, lenticel, 661. 



Elecampane, inulin, gi4. 



Elm, 655- 



Elodea, vascular bundle, 687. 



Elongation, 646, 648, 725, 726, 727, 728, 



7^9. 736- 

 Embryo, 816, 826, 905, pji; sac, 826. 

 Emergence, 654, 742. 

 Endemic plants, 927. 

 Endodermis, 511, 617, 683, 696, 703, 

 Endogenous origin, 489. 

 Endoparasite, 763. 

 Endosaprophyte, 787, 802. 

 Endosperm, 906, QI3, Q14. 

 Endotrophic mycorhiza, 702, 703, 7g6. 

 Entomophilous flowers, 487, 838. 

 Ephedra, 664. 

 Epidendrum, air roots, 510. 

 Epidermal cork, 705; gland, 622, 623. 

 Epidermis, 4gi, 493, 511, 530, 531, 532, 



533, 534. 535, 536, 558, 560, 567, 568, 



570, 571, 572, 573, 574, 576, 577, 58i, 



615, 617, 621, 623, 632, 642, 661, 688, 



704, 724, 76g, 781, 782. 

 Epigaean germination, 4gi, $35, 936. 

 Epigynous flowers, 828, 857. 

 Epilithic lichens, 615. 

 Epinasty, 582. 

 Epiphyll, 659. 

 Epiphyte, 657, 658, 659, 660; absorption, 



614,615; dispersal, 927; roots, 510, jji, 



512, 514- 

 Epistrophe, 524. 

 Epithem, 621. 



Equilateral leaves, 629, 630, 631. 

 Equisetum, reproductive variation, 885 ; 



stem variation, 733. 

 Erectness, stem, 647. 

 Ergot, sclerotium, 808. 

 Ericaceae, leaves, 578. 

 Erythronium, dropper, 505. 

 Etiolation; etiolin, 522. 

 Eupatorium, cork, 705. 

 Euphorbia, habit, 647; nectary, 844; 



pollen, 831. 

 Euphrasieae, parasitism, 772, 773, 774, 775. 

 Everbloomer, 887. 

 Evergreen, herbs, 712 ; trees, 583, 584, 585, 



586, 709, 710. 

 Evergrower, 737. 



Excretion, 620, 622, 626, 722, 724; root, 493. 

 Excurrent trees, 584, 647, 648. 

 Exfoliation, 708, 7og. 

 Exine, 830, 831. 

 Existence, struggle for, 487. 

 Exodermis, 492, 511.' 

 Exogenous origin, 489. 

 External factors, 486, etc. 

 Extrafloral nectaries, 844, 858. 



