304 



BRITISH PLANTS 



Crops : in Great Britain, 19 ; catch-, 

 98 ; root-, 98 ; rotation of, 97 ; 

 variation in, 222 



Cross-fertilization, 164, 165 ; -polli- 

 nation, 164, 166 



Crueiferae (Crucifers), fr., 188 ; 

 honey, 172 ; inn., 179 



Cryptogams, |183 



Cuckoo-flower, 196 (see Cardamine 

 pratensis) ; -pint, 175 (see Arum 

 maculatum) 



Cucumber (see Cucumis) ; squirting, 

 196 



Cucumis, tendrils, 119 



Cucurbita, tendrils, 119 



Cudweed, 39, 60 



Cultivated fruits, 148, 149, 154; 

 ground: weeds of, 296 (list), 

 annuals of, 60, 216 (list) ; land, 

 18, 19 



Cultivation : annual weeds of, 108 ; 

 of food-products, 18 



Cupule, *187 



Currant, 61 ; acids in, 143. See 

 Ribes 



Current-leaves, 235 



Cuscuta : twiner, 116, *128 ; germi- 

 nation of seed, 128 ; parasitic 

 nature of, *128 



Cushion-growth, 38 ; -plants, 114 



Cuticle, *40, *45, 140; in aquatics, 48 



Cutin, 40 



Cyclamen, 215 



Cyme, 178, 180, *181 



Cypress, *39, 42 



Cypsela, *186, *195, *197 



Cyiisus scoparius, 220. See Broom 



Dabcecia, 213 



Dahlia, tubers, 111 



Dairy-farming, 20, 21 



Daisy, 126, 217 ; rosette-habit, 115 



Dandelion, 37, 126, 152 ; fr., 195 ; 

 infl., 181 ; latex, 142 ; leaf -mosaic, 

 68 ; pollination, 170 ; rosette- 

 habit, 115; root, 111. See Tarax- 

 acum 



Darkness, effect on growth, 71 



Darwin : on climbing pis., 115 ; cross- 

 fertilization, 164 ; dispersal of 

 seeds, 197 ; earthworms, 96 ; evo- 

 lution, 202, 204 ; primrose, 177 



Date, seed, 146 



Deadly nightshade, 217. See Atropa 

 Belladonna 



Deadnettle, 30, 62, 216 ; honey, 173 



Deal, 22 



Deciduous trees and shrubs, 60, 109 ; 

 woods, 265, 270 (mixed) ; wood- 

 land, belt in Europe, 22 



Decomposition, 78, 93 



Defensive equipment of pis., 135 



Dehiscence of fruits, 187 



Denizens, 215 



Denudation, agents of, 80 



Deserts, 16, 17, 35, 86, 88, 281 



De Vries, 204, 205, 221 



Dhurra. See Sorghum vulgare 



Dichogamy, f 176 



Dicotyledonous woodland, 16 



Diffusion, 8, 25, 50, 92 



Digitalin, 143 



Digitalis purpurea, 143. See Fox- 

 glove 



Dimorphism, f!77 



Dioecious fls., f!76 



Dioncea, 132 



Disease-producing enemies of pis., 

 135 



Dissected leaves in aquatics, 50 



Dodder. See Cuscuta 



Dog-rose. See Rosa canina 



Dog's-mercury, 62 ; pollination, 176 ; 

 rhizome, 154. See Mercurirdis 

 perennis 



Dog's-tail grass, 217 



Dominant pis., 227 



Draba verna, 60, 107, 218 



Drosera, 89 ; insectivorous pi., 129, 

 *130 ; See Sundew 



Drought, effect on blooming of 

 annuals, 107 



Drugs, 152 



Drupe : dispersal, 196 ; of holly, 

 *147 ; protection by bloom, 136; 

 structure, *192 



Dry as octopetala, 114 



Dry ness, physiological, 34 



Dry side of mountains, 12 



Duckweed, 49. See Lernna 



Dune-marsh, veg. of, 283 



Dune-ridges, veg. of, 231, 281 



Dunes, 80 ; fixed, 230, 282 ; grey, 

 282 ; shifting, 281 ; white, 281 



Dutehman's-pipe, 176, 217. See 

 Aristolochia 



Dwarfing of plants, 36; by wind, 

 77, 284, 286 



Earth-acids, 83, 88, 94 



Earthworms, 88, 96, 265 



Ecological groupings : climatic, 16 ; 

 physiognomic, 16 ; by habitat, 

 223 ; by plant-associations, 224 



