GENERAL INDEX 



301 



pollination, 167 ; shade cast by, 

 272 



Beechwood-association, 229, 272 



Beer, 20, 151 



Bees, 172, 173, 174 



Beet, fleshy root, 150 ; sugar in, 

 146 



Beetles, pollination by, 172, 174 



Begonia, vivipary, 160 



Belladonnin, 143 



Belt on myrmecophily, 133 



Herberts vulgaris spines, 140, *141. 

 See Barberry 



Berry, 136, 192, 193, 196 



Beverages, 151 



Bibliography, 231, 232 



Bidens, 59 ; fr., *197 



Biennials, 58, 60, 108 ; leaves, 115 ; 

 tuberous roots, 111 ; xerophytic 

 chars, of, 60 



Bilberry, acids in, 143 



Bindweed, 217 



Biological classifications, 105 ; habi- 

 tats, 223, 225 



Biology, f!04, 184 



Birch, 22 ; bud-scales, 61 ; com- 

 petition with the oak, 270, 271 ; 

 infl., 180 ; pollination, 167 



Birchwood-assoeiation, 229, 271 



Birds : migratory, 198; as pollinators, 

 176 ; as seed-distributors, 196, 

 198, 209, 211, 213, 233; water-, 

 233 



Bird's-foot trefoil, 217 ; root-nod- 

 ules, *95. See Lotus cornicu- 

 latus 



Bird's-nest orchid. See Neottia 



Bird's-nest, yellow. See Monotropa 

 Hypopitys 



Birthwort, 218. See Aristolochia 



Bitter principles in pis., 136, 139, 

 142 



Blackberry : bud-scales, 61 ; fr., 192. 

 -See JRubus fruticosus and Bramble 



Black bryony. See Tamus com- 

 munis 



Black horehound. See Ballota nigra 



Black medick. See Medicago lupu- 

 lina 



Blackthorn. See Prunus spinosa 



Bladderwort. See Utricularia 



Bluebell, 228 ; fr., 187 



Bog-associations, 246 ; Carex, 231 ; 

 Juncus, 231 ; Molinia caerulea, 

 231, 250, 251 ; Myrica, 231, 250, 

 253 ; Sphagnum, 231, 250 



Bog-moss. See Sphagnum 



Bogs, 240, 246 ; insectivorous pis. in, 



131 ; xerophytic factors of, 35 

 Boulder-clay, 80 

 Box, 39 ; leaf -form, 43 ; leaf-mosaic, 



68 ; pollination, 176 

 Bracken, 89, 228 

 Bracts, 181, 194 

 Bramble, 220, 221 ; honey, 173 ; 



prickles, 141. See Rubus fruti- 



cosus and Blackberry 

 Brandy, 151 

 Brassica, 216 



Brazil-nut, 146 ; oil in, 143 

 British Isles : agriculture, 19 ; cli- 

 mate, 12 

 Broccoli, 150 



Bromus arvensis, 216 ; mollis, 60 

 Brood-buds, 161 ; in aquatics, 54 

 Broom, 44, *45, 89, 152, 220 ; honey, 



171 ; pollination, 169, 171. See 



Cytisus scoparius 

 Broomrape. See Orobanche 

 Brussels-sprouts, 150 

 Bryonia dioica, 214 ; berries, 149 ; 



pollen-flower, 171 ; tendrils, 119 

 Bryony : black (see Tamus corn- 

 munis] ; white (see Bryonia dioica) 

 Buckthorn, 152 

 Bud-detachment, 161 ; -protection, 



60 ; -scales, 61 ; -variation, 153 ; 



winter-buds, 60 

 Bulbils, 62 ; repr. by, 160 

 Bulbs, 62, 111, 115, 143, 161 ; 



multiplication by, 156 

 Bull's-horn acacia. See Acacia 



cornigera 



Burdock, 60, 108 ; fr., 197 

 Bur-marigold. See Bidens 

 Bush-communities, 17 ; -swamp, 243 

 Butcher's-broom, 214 ; phylloclades, 



44, *45 

 Buttercup, 218 ; fr., 187 ; honey, 172 ; 



hydathodes, 28 ; nectaries, 169, 



*170 ; seed, 146 

 Butterflies, 170, 173, 174 



Caatinga forests, 10 



Cabbage (Brassica oleracea), 150 



Cacti, 9, 165 



Cakile maritima, 59 



Calcareous marl, 82 ; rocks, 82 ; 



soils : pastures on, 272, woods on, 



272 



Calceolaria pollination, 171 

 Calcifuges, 89, 260 

 Calciphilous pis., 89 ; list of, 260 

 Calcium oxalate, 142, 143 



