GENERAL INDEX 
according to: frequency of seed- 
ing, 112, longevity, 107, mode of 
growth, 114, mode of nutrition, 
123, water, 28, 64 
Clay, 82; absorptive power, 87; 
origin, 81; permeability, 87; 
physical properties of, 82, 90; 
relation to water, 92; water- 
capacity of, 87; water-retaining 
capacity of, 87 
Clayey loam, 82 
Claytonia, 215 
Cleavers, 60, 197. 
Aparine 
Cleistogamous fis., +165, 275 
See Galium 
Clematis Vitalba, 214, 217 ; fr., *195; | 
pollen-flower, 168 ; tendrils, 119 
Cliffs, veg. of, 283 
Climate, 9 ; effect on veg., 15 ; types 
of, 12 ; relation of soil to, 84 
Climatic factors, 9 ; types of veg., 16 
Climbers, root-, 119; stem-, 114; 
tendril-, 120 
Climbing habit, evolution of, 120 
Climbing lily. See Gloriosa superba 
Climbing plants, 115; habitat of, 
119; leaf-mosaic, 68; of the 
hedgerow, 293; of woods, 267. 
See also Cuscuta, 128 
Clouds, effect on climate, 13 
Clover, 20 ; infl., 179 ; root-nodules, 
95; sleep-movement of leaves, 
70 ; white, insect-visitor, 171, 174. 
See Trifolium repens 
Cloves, 151 
Clubmoss, *46 
Coal, 83 
Coccus, 190 
Cock’s-foot, 217 
Cocoa, 151 
Coco-butter, 148 
Coconut, source of alcohol, 151 ; oil, 
147, 148 
Coffee, 151 
Colchicum autumnale, 159 
Cold : effect on absorption of water, 
33; effect on pls., 73; effect on 
formation of humus, 83 
Colonists, 215 
Colonization: of islands, 208; of 
British Isles, 209 ; of Ireland, 214 
Colour-adaptations, in alge, 53 
Colour of young leaves and shoots, 
73 
Coltsfoot, 62 
Columbine, position of honey, 173 
Colza-oil, 148 
| Cotton-grass 
303 
Combustion, 78 
Commons, 271, 296 ; veg. of, 296 
Competition among pls., 4, 55, 203, 
208, 210 
Composit# : infl., 181 ; self-pollina- 
tion in, 177 ; sleep-movements in 
flower-heads, 71; unisexual fls., 
176 ; insect-visitors, 170 
Concrescent type of leaf, *39, 42 
Condiments, 151 
Cones of pine, 184 
Coniferous forest-belt, 22; woods, 
250 
Conifers: pollen, 167; seeds, 183 ; 
dispersal of seeds, 196 
Continental climate, 12, 23 ; islands, 
207 
Convolvulus : nectaries, *169; se- 
pium, climbing plant, 116, * 117, 
insect-visitor, 171 
Copper-beech, origin of, 205 
Coppicing : effect on leaf-fall, 109 ; 
on veg. of woods, 268 
Copses, 268 
Corallorhiza innata, saprophyte, 124, 
*125 
Coral-root orchid, 217. See Coral- 
lorhiza 
Cork, 41, 60, 61, 140 
Corms, 62, 63, 111; multiplication 
by, 161 
Corn-bluebottle, 216; -buttercup, 
60 ; -cockle, 216 ; -marigold, 216 ; 
-spurrey, 60 
| Corolla, 162 
| Cortex, *45 
Corydalis claviculata, evolution of 
tendril, 120 
Corymb, *179 
Cotton-grass, 217. See Hriophorum 
Cotton-grass association, 225 
(Eriophorum) moor, 
231, 250, 251, 252, 253, 254, 255 
Cotton-seed oil, 148 
Cotyledons, storage of food in, 146 
Couch-grass, 62; rhizomes, *110, 
154 
Cow-wheat. See Welampyrum 
Cranberry, citric acid in, 143 
Crane’s-bill. See Geranium 
Crategus Oxyacantha, thorns, 140. 
See Hawthorn 
Creeping Jenny, 156 ; stems, 156 
Crithmum maritimum, 59 
Crocus, 62, 115, 215; structure of 
corm, *158; autumn- (see Col- 
chicum autumnale) 
