316 



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 



CruciferSB (Cruoifers), fr., 188; 

 honey, 172 ; infl., 179 



Cryptogams, tl83 



Cuekoo-flowor, 196 (see Cardamine 

 pratensis) ; -pint, 175 (see Arum 

 maciilatum) 



Cucumber (see Cucumis) ; squirting, 

 196 



Cucumis, tendrils, 119 



Cucurhita, 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 

 Ribea 



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 



Cytisus scoparius, 220. See Broom 



Daboscia, 213 



Dahlia, tubers. 111 



Dairy-farming, 20, 21 



Daisy, 126, 217 ; rosette-habit, 115 



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

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

 68 ; pollination, 170 ; rosette- 

 habit, 115; root. 111. See Tarax- 

 acum, 



Darlfness, 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, 1S2 



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 Vrles, 204, 205, 221 



Dhurra. See Sorghum vulgare 



Dichogamy, tl76 



Dicotyledonous woodland, 16 



Diffusion, 8, 25, 50, 92 



Digitalin, 143 



Digitalis purpurea, 143. See Fox- 

 glove 



Dimorphism, tl77 



Dioecious fis., tl76 



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 Mercurialis 

 perennis 



Dog's-tail grass, 217 



Dominant pis., 227 



Draba verna, 60, 107, 218 



Drosera, 89 ; insectivorous pL, 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 



Dryness, physiological, 34 



Dry side of mountains, 12 



Ducliweed, 49. See Lemna 



Dune-marsh, veg. of, 283 



Dune-ridges, veg. of, 231, 281 



Dunes, 80 ; Bxed, 230, 282 ; grey. 

 282 ; shifting, 281 ; white, 281 



Dutchman's-pipe, 176, 217. See 

 Aristolochia 



Dwarfing of plants, 36; by wind, 

 77, 284, 286 



Earth-acids, S3, 88, 94 



Earthworms, 88, 96, 265 



Ecological groupings : climatic, 16 ; 

 physiognomic, 16 ; by habitat, 

 223 ; by plant-associations, 224 



