540 



PRACTICAL BOTANY 



Monoecious, 107, 108* 



Morchella, 229* 



Morel, 229* 



Morning-glory, fruits of, 153* 



Morphology, 159 



Morphology of the flower, 104*, *323- 



327 



Mosaics, leaf, 59*, 60 

 Moss, life history of, 257*-265 

 Mosses, 158, *257~265 

 Mucor, 214-217 

 Muehlenbeckia, 40* 

 Musci, 273 



Mushroom, 240, *247~252 

 Mustard seedling, root hairs of, 8* 

 Mutations, 412 

 Mutualists, 35-38*, 213 

 Mycelium, 214 

 Mycorrhiza, 38* 

 Myrsiphyllum, 41* 

 Myxomycetes, 224*, 225 



Naked buds, 90 



Nectar, 124 



Nectar glands, 124* 



Nectaries, 124 



Nest fungi, 255* 



Netted veining, 336* 



New Zealand, displacement of na- 

 tive plants in, 501, 502 



Nightshade, leaf mosaic of, 59* 



Nightshade family, *364-367 



Nilsson, Hjalmar, 417 



Nitrification, 36, 37, 374, 377 



Nitrogen, 15, 17, 374-378, 448, 449 



Nitrogen-fixing bacteria, 374-378, 448 



Nocturnal position, *64-66 



Nostoc, 182*, 183, 184 



Nucellus, 117* 



Nucleus, 8* 



Nutrient substances, 15 



Nutrition of plants, 15-17, 36-38, 39, 

 40, *77-81, 160, *371-388, 447-451 



Oak leaves and acorns, 157* 



Oak tracheids, 48* 



Oak trees, 410* 



Oak wood, cross section of, 50* 



Oat, root system of, 26 



Oat smut, 240*-242 



Oats, 455, 457 



Odors of flowers, 124, 125 



03dogonium, 201*, 202* 



Oil, 138, 144 



Oleander leaf, 76 



Olive, vertical leaves of, 64* 



Olive family, 370 



Onion, seed and seedling of, 137* 



Onoclea, 289* 



Oogonium, 201*, 203* 



Oospore, 201, 203*, 221*, 222*, 261, 



270, 284, 309, 326 

 Open bundles, 54 

 Opposite leaves, 55* 

 Orange, 431, 462 

 Orchid, 31*, 382 

 Orchis family, *346-348 

 Order, 158 

 Origin of sex, 197 

 Orobanche, 383* 

 Oscillatoria, 184, 185*, 186 

 Osmosis, 79 

 Osmunda, 287* 

 Ovary, 112*, 324*, 324 

 Ovule, 112*, 306, 324* 

 Ovule, structure of, 21*, 306*, 324* 

 Oxygen, 17*, 19 



Palisade cells, 14* 



Palm family, 341 



Palms, *340-343 



Panicle, 517* 



Parallel veining, 336* 



Parasites, 35-37, 156, 213, 218, 219, 

 222, 223, 226, 229, 234, 240, 241, 

 372, 381, 383*, 384* 



Parasitic bacteria, 378, 379 



Parasitic roots, 35, 36 



Parasitism, 372 



Parenchyma, 14* 



Parsley family, 357, 358, 359* 



Parsnip fruit, 359* 



Parthenogenesis, 219 



Pasteur, Louis, 165, 178, 233 



Pathology, 159 



Pea family, *353-355 



Pea seedling, mutilated, 144* 



Peach flower, prepared for hybridi- 

 zation, 427* 



Peach mildew, 234 



Peach rot, 228 



Peaches, 461, 462 



Peanut seedling, 22* 



Peanuts, crop of, 354 



Pears, 460 



Peat, 264*, 265 



Peat bogs, 265 



Peat moss, 264*, 266 



Pedicel, 519 



Peduncle, 619 



