INDEX 



549 



Mutations, 497-499 



Mutilated seedlings, growth of, 8* 



Mycelium, 240* 



Mycorrhiza, 269, 270* 



Myrsiphyllum, 56* 



Myxomycetes, 169 n. 



Naked buds, 80*, 81* 



Natural selection, 498 



Nebraska vegetation, Plate IX 



Nectar, 423 



Nectar glands, 423* 



Nectaries, 423 



Negundo, radial and cross sections 



of stem of, 61* 

 Nemalion, 216, 217* 

 Nereocystis, 209* 

 Nest fungi, 269* 

 Netted veined, 89*, 90* 

 Nettle, stinging hair of, 418* 

 Nightshade, leaf of, 416* 

 Nitella, 201 

 Nitrification, 233 

 Nitrogen, 28 



Nitrogen, circulation of, 231*, 233 

 Nitrogen, fixation of, 234, 235 

 Nocturnal position, 97, 98* 

 Node, 16, 17*, 57, 59 

 Nomenclature, 153 

 Nostoc, 176, 177 

 Notched, App. I 



Nucellus, 356, 371, 372*, 381*, 386* 

 Nuclear division, 165* 

 Nucleole, 164 

 Nucleus, 34, 35*, 104* 

 Nut, 147*, 148 

 Nutrient substances, 28, 29 

 Nutrition of plants, 106-111 



Oak leaves, arrangement of, 94* 



Oat, root system of, 26, 27 



Obcordate, App. I 



Obovate, App. I 



Obtuse, App. I 



Odors of flowers, 423, 424 



(Edogonium, 188-190* 



Offensive-smelling plants, 419 



Oil, 9, 11 



One-celled green algaB, 179-184* 



Onion leaf, section of, 53* 



Onoclea, 315* 



Oogonium, 188, 189*, 204, 212 



Oospore, 166, 183*, 189*, 204 



Opening, 490, 531* 



Open veining, 89*, 90* 



Ophioglossum, 324* 



Opposite branching, 41* 



Orange, 148* 



Orbicular, App. I 



Orchid, aerial roots of an, 19* 



Order, 153 



Origin of sex, 187 



Oscillatoria, 175, 176* 



Osmosis, 36-39* 



Osmosis in an egg, 37* 



Osmosis in root hairs, 39 



Outline of classification, 155 



Ovary, 128*, 377* 



Ovate, App. I 



Overcrowding, 448-450* 



Ovule, 123*, 128, 356 



Ovule case, 377*, 380* 



Ovule, structure of, 144* 



Oxalis leaf, development, 86* 



Oxidation, 7 



Oxygen making, 7, 28, 29, 113, 115 



Pacific slope, 490, 494, 495 



Paleobotany, definition of, 2 



Palisade cells, 102, 103*, 105*, 107 



Palmate, 89, 91*, 92* 



Palms, 57*, 111*, Plate XIII 



Pampas region, 451 



Panicle, 135*, 136 



Pansy, leaf-like stipules of, 88* 



Papilionaceous corolla, 125* 



Papillae on stigma of a lily, 142* 



Parallel veining, 89*, 90 



Paraphysis, 251*, 298* 



Parasites, 22*, 23, 172, 227, 407-409* 



Parasitic roots, 22*, 23 



Parenchyma, 64*, 106* 



Parietal placenta, 129*, 130 



Parthenogenesis, 244 



Pea pod, 443* 



Pea seedling, mutilated, 8* 



Pea seedling on whirling disk, 32* 



Peat, 291, 292 



Peat bogs, 292 



Peat moss, 290-292* 



Pedicel, 133* 



Peduncle, 133* 



Peltate, App. I 



Penicillium, 250* 



Pepo, 149 



Perennial, 26*, 46 



Perianth, 123*, 126*, 129*, 130* 135*, 



App. II 



Perianth, differentiation of, 394 

 Pericarp, 149, 150* 



