536 



PRACTICAL BOTANY 



Dahlia, thickened roots of, 34* 



Daily movements of leaves, *64-66 



Damping off, 223 



Dandelion, 27 



Dandelion, fruits of, 147* 



Darwin, Charles, 148 



Dasya, 211* 



Date palm, 344 



Decay, 166, 167 



Deciduous, 19, 66, 68, 302 



Definite annual growth, 95 



Dehiscence, 323 



Denitrification, 377 



Dependent habit, 213 



Dependent plants, *371-388 



Desert plants, 35, 156, 508, 509* 



Deserts of United States, 508 



Desmids, 204* 



Desraodium, 355* 



Desmodium, fruits of, 154* 



Determinate inflorescence, 519 



Diadelphous, 111 



Diagrams, floral, 114* 



Diastase, 145 



Dichogamy, 131*, 132* 



Diclinous, 106* 



Dicotyledonous stem, cross section 

 of, 12*, 4.5*, 49*, 50* 



Dicotyledonous stem, gross structure 

 of, 12*, *48-53 



Dicotyledonous stem, minute struc- 

 ture of, *44-48 



Dicotyledonous stem, rise of water 

 in, 11 



Dicotyledons, 12, 327 



Dicotyledons, families of, *350-370 



Diffuse porous wood, 392* 



Diffusion, 79, 80 



Dimorphous flowers, 132, 133* 



Dioecious, 106*, 107* 



Dionsea, 387* 



Diphtheria, 172, 173 



Disease, 171, 172, 173, 174, 176 



Disk flowers, 369* 



Distribution of plants, 1, *494-513 



Distribution of seeds, *146-155 



Diurnal position, *64-66 



Dodder, 36, 383, 384, 466* 



Dogtooth violet, 83*, 345 



Double fertilization, *324, 326 



Douglas fir, 315* 



Downy mildew, 219*, 222 



Dragon root, 342* 



Drainage, 436, 437-439 



Draparnaldia, 204* 



Dry fruits, 151 

 Dry-land farming, 440 

 Duckweed, 477* 

 Duct. See Vessels 

 Dunes, 500* 



Earth star, 254 



Earthworms, 437 



Eastern and central forest region, 



*503-505 

 Ecological groups, 479, 480 

 Ecology, plant, definition of, 118, 



119, 159 

 Ecology, summary of, *477-513 

 Economic botany, 159 

 Ectocarpus, 208 

 Edible seeds, dispersal of, 155 

 Egg apparatus, 21*, 117*, *324 

 Egg cell, 117*, 201 

 Elater, 270, 292* 

 Elder stem, structure of, 49* 

 Elementary species, 417 

 Elm, flowers and flower clusters of, 



352* 

 Elm buds, 96*, 97* 

 Elm fruit, 150* 

 Embryo, 118, *136-139, 284, 309*, 



327* 

 Embryo sac, 21* 117* 

 Endosperm, 118, *136-139, 325* 

 Endosperm nucleus, 117*, 325* 

 Energy, source of, in plants, 19 

 Enzymes, 116, 144, 145 

 Epidermis, 14*, 24*, 45*, 46, 483*, 



484 

 Epigynous, 114 

 Epiphytes, 381, 382 

 Equisetineae, 291 

 Equisetum, *291-293 

 Ergot, 233, 234 



Erosion, 28, 407, 408, *441-446 

 Eryngium flower stalk, structure of, 



49* 

 Esparto, 337 

 Euphorbia, 356*, 485* 

 Evening primrose, flowers of, 113* 

 Evening primrose, fruits of, 153* 

 Evening primrose, rosettes of, 57* 

 Evergreen, 302 

 Evolution of plants, 380, 334 

 Evolution of sex, 197 

 Excretion of water, 18 

 Excretions, 166, 167, 172 

 Existence, struggle for, 148-151 

 Explosive fruits, 163* 



