INDEX 



Monotropa, mycorhiza, 792. 



Moors, 942. 



Morning glory, flowers, 849. 



Morphological ecology, 485. 



Morus, fruit, 024; leaf variation, 60 3. 



Mosaic, leaf, 543, 544, 607. 



Mosses, absorption, 610, 611, 612, 613; 



chlorenchyma, 533; chloroplasts, 521; 



conductive tissue, 685, 686; rhizoids, 



5/7, 518; vegetative reproduction, 807. 

 Motherwort, leaf variation, 606. 

 Moths, 841. 

 Motile leaves, 579, 580. 

 Mountain sheep, 738. 

 Movements, chloroplasts, 524; leaves, 579, 



580; stomata, 562; zoospores, 810. 

 Mucilage; mucilage glands, 5/7, 622, 624, 



632, 723- 



Mucor, habit, 755; sporangium, 811. 

 Mulberry, fruit, 924; leaf variation, 603. 

 Mullein, hairs, 572. 

 Multicipital stems, 504, 676, 677. 

 Musa, leaves, 585. 

 Mustard, root hairs, 491. 

 Mutualism, 786. 

 Mycelium, 755. 

 Mycophyte, 794. 

 Mycoplasm, 764. 

 Mycorhiza, 797, 792, 793, 796; ectotrophic, 



7Qi, 792; endotrophic, 792, 793, 796. 

 Mycosymbiosis, 791, 792, 793, 794, 796, 



798, 799. 



Myriophyllum, stem section, 551. 

 Myrmecophily ; myrmecophyte, 753, 754. 



Nanism, 734. 



Narcissus, flowers, 902. 



Nasturtium, flower, 843; phototropism, 



540; plastids, 522 ; pollen, 831; stomata 



620. 



Natural selection, 743, 876, 952. 

 Nectar, 843, 858. 



Nectary, 843, 844; extrafloral, 844, 858. 

 Nematus, gall, 782. 

 Neottia, mycorhiza, 796. 

 Nepenthes, 618. 

 Nephrolepis, 653. 

 Nereocystis, 519. 

 Nerium, leaf section, 567. 

 Nettle, stinging hairs, 577. 

 Nicotiana, 548. 

 Nightshade, pollen, 831. 

 Nine-bark, exfoliation, 709. 

 Nipa, stoma, 558. 

 Nitrification, 789. 

 Nitrogen fixation, 789, 797. 

 Nitrogenous food, 914. 

 Node, 489, 501, 660. 

 Non-nitrogenous food, 913. 



Normal plants, 892, 894. 



Nucellus, 905. 



Nut, 919, 925. 



Nutrition and leaf form, 594, 605. 



Nutritive hair, 782; layer, 782, 783; root, 



497, 513- 



Nyctitropic movements, 579. 

 Nymphaea, leaf section, 561. 

 Nyssa, 508. 



Oak, acorn, 925; cork, 705; gall, 782; 

 habit, 649; leaf variation, 602. 



Obligate dwarfs, 734 ; epiphytes, 660 ; 

 hydrophytes, 951; mesophytes, 951; 

 parasites, 762 ; saprophytes, 762 ; xero- 

 phytes, 951. 



Oblique palisades, 535, 536. 



Ocelli, 531. 



Odor, 847. 



Oenothera, capsule, 920; rosette, 714. 



Offset, 672, 837. 



Offspring, 805. 



Oil, 522, 62 3, 624, 723; gland, 624. 



Oleander, leaf section, 567. 



Olive, sclereid, 639. 



Onion, inflorescence, 874; seedling, 935. 



Oogonium, 817. 



Oospore, 817, 826. 



Opening of flowers, 872. 



Operculum, 814. 



Opuntia, 725. 



Orange, oil gland, 624. 



Orchids, mycorhiza, 793, 795, 796; polli- 

 nation, 860; roots, 5/0, 5//, 5/2. 



Organization characters, 951. 



Orobanche, 770. 



Orthostichy, 549, 595, 642. 



Orthotropic organs, 748. 



Orthotropous ovules, 905. 



Osmanthus, sclereid, 639. 



Osmorhiza, fruit, 924. 



Osmotic pressure, 493, 627. 



Osmunda, 550. 



Ovary, 826, 828, 854. 



Ovule, 826, 905. 



Own pollen, 855. 



Oxulis, leaves, 579; pollen, 831. 



Paeonia, flower, 826. 



Palisade cells, 530, 532, 533, 534, 535, 536, 

 538, 539, 551, 56i, 567, 574, 630, 631, 

 639, 642, 724, 781; arm, 532; oblique, 

 535, 536. 



Palmate leaves, 676, 858. 



Palmetto, habit, 645, 653. 



Panax, corm, 676. 



Panicle, 828, 835. 



Pappus, 57, 92/. 



Paramoecium, 821, 





