304 
Crops : in Great Britain, 19 ; catch-, 
98; root-, 98; rotation of, 97; 
variation in, 222 
Cross-fertilization, 164, 165 ; -polli- 
nation, 164, 166 
Crucifere (Crucifers),  fr., 
honey, 172 ; infl., 179 
Cryptogams, 7183 
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 
188 ; 
Cytisus scoparius, 220. See Broom | 
Dabecia, 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 Taraz- 
acum 
Darkness, effect on growth, 71 
Darwin : on climbing pls., 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 
BRITISH PLANTS 
Deciduous trees and shrubs, 60, 109 ; 
woods, 265, 270 (mixed) ; wood- 
land, belt in Europe, 22 
Decomposition, 78, 93 
Defensive equipment of pls., 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, +176 
Dicotyledonous woodland, 16 
Diffusion, 8, 25, 50, 92 
Digitalin, 143 
Digitalis purpurea, 143. See Fox- 
glove 
Dimorphism, +177 
Diecious fls., +176 
| Dionea, 132 
Disease-producing enemies of pls., 
135 
Dissected leaves in aquatics, 50 
Dodder. See Cuscuta 
Dog-rose. See Rosa canina 
Dog’s-mereury, 62 ; pollination, 176; 
rhizome, 154. See Mercurialis 
perennis 
Dog’s-tail grass, 217 
| Dominant pls., 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 
| Dryas octopetala, 114 
| Dryness, physiological, 34 
Dry side of mountains, 12 
Duckweed, 49. See Lemna 
Dune-marsh, veg. of, 283 
Dune-ridges, veg. of, 231, 281 
Dunes, 80; fixed, 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, 83, 88, 94 
Earthworms, 88, 96, 265 
Ecological groupings: climatic, 16 ; 
physiognomic, 16; habitat, 
223 ; by plant-associations, 224 
