364 
Mildews, *238-242, 244 
Milk supply, 209 
Milkweed, pollination of, *148-150 
Mississippi River, delta of, 27 
Mississippi River, silt carried by, 27 
Mistletoe, 31*, 52* 
Mixed buds, 95, 99% 
Molds, #235-239 
Monocotyledonous stems, 68 
Monocotyledonous stems, growth of, 
in thickness, 68 
Monocotyledons, 158, 802, 306 
Monotropa, 50*, 51* 
Morchella, 243*, 244, 261 
Morel, 248%, 244 
Morphology, 197 
Mosaics, leaf, 74 
Moss, life history of, *262-266 
Mosses, *262-268 
Mucor, 236* 
Muehlenbeckia, 57* 
Musci, 281 
Mushroom, 234*, 243%, #256-261 
Mustard seedling, root hairs of, 10* 
Mutations, 173 
Mycelium, 236 
Naked buds, 94 
Nectar, 138 
Nectar glands, 138* 
Netted veining, 70 
Nilsson, Hjalmar, 180 
Nitrification, *204-207 
Nitrogen, 39 
Nitrogen-fixing bacteria, 39 
Nocturnal position, 77 
Nostoc, *219-221, 260 
Nucellus, 136* 
Nucleus, 21*, 136%, 224* 
Nutrition of plants, *34-55 
Nuts, 156 
Oak leaves and acorns, 195* 
Oak trees, 8* 
Oak wood, 65*, 109 
Oat smut, 252*, 253 
Odors of flowers, 151 
Onoclea, 277* 
Odgonium, 228* 
Odspore, 228* 
Open bundles, 69 
Opposite branches, 97* 
Opposite leaves, 71*, 72 
Order, 196 
Oscillatoria, 219, 221*, 260 
INTRODUCTION TO BOTANY 
Osmosis, 41 
Ovary, 1380, 131*, 300 
Ovule, 16, 17, 180, 131*, 186* 
Ovule, structure of, 136* 
Oxygen, 39, 343, 344 
Palisade cells, 36* 
Parallel veining, 70* 
Parasites, 49, *51-53, 284 
Parasitic bacteria, 210-215 
Parasitic roots, 31* 
Parasitism, 49, #234-261 
Parmelia, 248*, 261 
Parsnip, wild and cultivated, 176 
Parts of a plant, 6, 7* 
Pasteur, Louis, 217, 218* 
Pathology, 197 
Pea seedling, mutilated, 165 
Peach, 318* 
Peach flower prepared for hybridi- 
zation, 189* 
Peach rot, 242* 
Peaches, 318* 
Pear, bud development, 99*, 100 
Pear blight, 210-212 
Peat bogs, 267 
Pelargonium, desert, 29* 
Penicillium, 245*, 261 
Perennial, 12, 44, 45* 
Perianth, 128 
Perigynous flower, 131* 
Perisperm, 158 
Periwinkle, flower of, 145* 
Petal, 14*, 125*, 126% 
Petiole, 13, 69* 
Pheophycee, 260 
Phanerogams, 299 
Phloém. See Bast 
Photosynthesis, 388 , 
Phycomycetes, 2385, 261 
Phylloxera, 330, 331 
Physiology, 197 
Phytopathology, 197 
Pine needle, 283, 284*, 285* 
Pine seed, 292*- 
Pine stem, growth of, 60, 61, 288 
Pine wood, section, 109* 
Pinus, *283-292 
Pistil, 15, *125-127, 130, 131*, 300 
Pistillate flower, 127* 
Pitcher plants, 54 
Pith, 11 
Placenta, 131* 
Plant breeding, *178-191 
Plant cell, *20-23 
