INDEX 
Cones of gymnosperms, 283, 284*, 
288%, 293* 
Conidia, 239 
Coniferous forest, 287%, 295*, 207* 
Coniferous woods, 108-110 
Conifers, industrial importance of, 
108, 288, 289 
Conjugation, 224*, 225 
Coppice, 118, 121 
Coprinus, 257*, 261 
Corm, 87 
Corn, cultivation of, 822 
Corn, fibrovascular bundles of, 11 
Corn, flowers of, 15*, 143*, 144* 
Corn, grains of, 17*, 183* 
Corn, pollination of, 143*, 144*, 184, 
185* 
Corn, root system of, 7*, 80*, 31 
Corn, whole plant, 7* 
Corn breeding, *181-186 
Corn smut, 251* 
Corn stem, structure of, 11*, 68* 
Corolla, 14*, 125* 
Cortex, 11*, 20*, 63* 
Cotton, 318 
Cotton wilt, 247 
Cottonwood buds, development of, 
100*, 101* 
Cottonwood plantation, 115* 
Cottonwood twigs, 100*, 101*, 105* 
Cotyledon, 158*, 159%, 162*, 164* 
Cowpea, 205* 
Crossing, 187 
Cross-pollination, 189, *144-154, 185* 
Crown gall, 211* 
Cryptogams, 299 
Cucumber, wilting of, 23* 
Cup (cupule) of Marchantia, 269* 
Cuticle, 285* 
Cuttings, 90* 
Cyanophycez, 260 
Cypress, 26*, 294 
Cytoplasm, 21 
Dahlia, thickened roots of, 45* 
Daily movements of leaves, 77* 
Dandelion, fruits of, 167* 
Darwin, Charles, 138, 167, 190* 
Dasya, 232*, 261 
Decay, 203, 204 
Deciduous, 82, 83 
Dehiscence, 299 
Denitrification, 206 
Dependent plants, *48-54 
Desert plants, 28, 29* 
361 
Detasseling corn, 185, 186, 188, 189 
Diastase, 166 
Dichogamy, 152*, 153* 
Dicotyledonous stem, cross section 
of, 12, 62 
Dicotyledonous stem, minute struc- 
ture of, 63*, 64* 
Dicotyledons, 158, 302, 306 
Diffusion, 41 
Digestion, 46 
Dimorphous flowers, 153* 
Diccious flowers, 127* 
Diphtheria, 213 
Disease, 210-218, 328-331 
Distribution of plants, 4 
Distribution of seeds, 166, 167, 170, 
171 
Diurnal position, 77* 
Dodder, 51*, 52 
Dogtooth violet, 72* 
Double fertilization, 302 
Douglas fir, 294 
Downy mildew, *239-242 
Drainage, 321 
Dry farming, 322, 323 
Duckweed, 29% 
Dunes, 2*, 4 
Ecology, plant, definition of, 137, 
197 
Economic botany, 197 
Edible seeds, dispersal of, 171 
Egg apparatus, 136*, 301* 
Ege cell, 136*, 228%, 301* 
Elater, 278*, 279 
Elementary species, 180 
Elements occurring in plants, 37-39 
Elodea, 31 
Embryo, 16, 17*, *158-160, 802, 803* 
Embryo sac, 300, 801*, 808* 
Endosperm, 158, 160*, 162*, 183%, 
308 
Endosperm nucleus, 136%, 303* 
Enzymes, 165, 166, 301 
Epidermis, 11*, 20*, 285* 
Epigynous, 131*, 182* 
Epiphytes, *48-52 
Equisetum, 278*, 279 
Erosion, 26, 27, *825-329 
Eucalyptus, 24, 76, 77*, 117* 
Euphorbia, 82*, 83 
Evening primrose, flowers of, 182* 
Evening primrose, fruits of, 168* 
Evening primrose, rosettes of, 72* 
Evergreen, 284 
