374 



INDEX 



Cyme, 193 

 Cypripedium, 366 

 Cystocarp, 282, 283 

 Cytology, 3 

 Cytoplasm, 45, 139 

 Cytoplasmic membrane, 52 



Double fertilization, 358, 359, 360 

 Downy mildews, 291 

 Drupe, 200 



Dry weight, definition of, 82 

 Duct, 101, 356 

 in vein, 68 



E 



Dandelion, environmental variation 

 in, 210 



root of, 41 

 Darwin, 7, 235, 236 



theory of, 235 

 Daucus, flower of, 363 

 Decay, produced by bacteria, 32, 



133, 288 

 Delphinium, plant of, 89 



stem of, 103 

 Desert association, 170 

 Desmids, 275 



Diageotropic response, 162 

 Diagrams of various flower types, 



189, 190 

 Dianthus, pollen of, 186 

 Diaphototropic response, 158 

 Diastase, 124 

 Diatomin, 276 

 Diatoms, 276 

 Dicotyledons, 360, 361 



embryo of, 198, 199 



flower of, 185 

 Differentiation, during growth, 149 



origin of, 245 

 Diffusion, 47, 48 



in the plant cell, 51-53 

 Digestion, 20, 122-124 

 Digitalis, stem of, 103 

 Dihybrid cross, 220, 221 

 Dimorphism, of flowers, 195 

 Dioecious, 192, 342 

 Dioscorides, 5 

 Discomycetes, 294 

 Division of cells, 140 



of labor, 17, 246 

 Dodder, as parasite, 171 

 Dominance, 213 



incomplete, 213, 218 



Ecology, 3, 154 

 Economic botany, 3 

 Ectocarpus, 278, 279 

 Egg, 198, 247, 267 



fertilized, 198, 354 

 Elaters, 316, 340, 342 

 Elderberry, variation in leaves of, 



208 

 Elements, essential for plant growth, 



31 

 Embryo, 198, 199, 345, 348, 358 

 Embryo-sac, 197, 346, 358, 359 

 Empetrum, leaf blade of, 165 

 Endodermis, of root, 46 

 Endosperm, 198, 199, 348, 358, 360 



nucleus, 197, 359, 360 

 Energy, kinetic, 69, 125 



potential, 69, 125 



relations of plants, 125 



release of, 126 

 Enlargement of young cells, 141 

 Environment, 154-177 



complexity of, 177 

 Enzymes, 123 

 Epidermis, of leaf, 65, 66 



of root, 46 



of stem, 94 

 Epigynous floral parts, 191 

 Epipetalous floral parts, 191 

 Epiphyte, 174, 175 

 Episepalous floral parts, 191 

 Equisetineae, 339 

 Equisetum, 339, 340, 341 



gametophytes of, 341 

 Ericales, 364 

 Eriophorum, fruit of, 200 

 Etiolation, 159, 160 

 Evidences for evolution, 229-235 



from geographical distribution, 231 



