326 



BRITISH PLANTS 



hypnoides, 38, 114 ; tridactylites, 

 60 ; unibrosa (London-pride), 37, 

 155, 213, 221 



Saxifrage: honey, 172 ; meadow- (see 

 Saxifraga granvlata) ; mossy (see 

 S. hypnoides) 



Scabious, 218 ; infl., 181 ; insect- 

 visitors, 170 



Scale-leaves of bulbs, 156 



Scales, bud-, morphology of, 61 



Scarlet runner, 116 



Scar-woods, 269 



Scent of pis., 143 



Schizocarps, tl90 



Sclerencliyma, 41, *43 



Scotland : climate, 13 ; alpine veg. of 

 Highlands, 287 ; veg. of mountains, 

 17, 287 



Scramblers, 115 



Scrophularia, insect-visitor, 174 



ScrophuIariacesB : hemi-parasites of, 

 126 ; honey, 173 



Scrub-communities, 17 



Scurvy-grass, 218 



Sea-blite (see Sueda maritima) \ 

 couch - grass association, 280 ; 

 -holly (see Eryngium) ; -purslane, 

 218 ; -rocket (see OaleUe mari- 

 tima) ; -samphire (see Grithmiim 

 maritimum) 



Seashore : condition of soil-water, 

 88 ; veg. of, 275 



Seaside-annuals, 58, 69 



Seasons, effect on veg. : summer 

 and winter, 10, 31, 57, wet and 

 dry, 10 



Seaweeds : colour of, 53 ; zoning of, 

 278, 283 



Sedges, 46, 62, 115 ; pollination, 167 



Sedum acre, *39 ; Bliodiola, 62 



Seedlings, *25 ; of Acacia, *44 ; 

 protection of, 138 



Seed-plants, 163, 183 



Seeds : in aquatics, 54 ; albuminous, 

 *146, *147 ; defensive equip- 

 ment, 135, 137 ; dispersal : by 

 animals, 196, birds, 196, man, 198, 

 water, 197, wind, 195 ; of epi- 

 phytes, 122 ; exalbuminous, 146, 

 *147 ; explosive, 196 ; formation 

 of, 162, 183 ; hairy, 195 ; oily, 148, 

 196 ; repr. by, 153, 162 ; resistance 

 to cold, 74 ; starchy, 147 ; sterile, 

 149 ; storage of food in, 108, 146 ; 

 winged, 195 ; xerophytic chars, of, 

 59, 74, 137 



Selective absorption, 91 



Sell-fertilization, 165 ; -pollination, 

 164, effect on stock, 165, preven- 

 tion of, 176 



Semi-deserts, 9, 12, 36 



Senecio, 105 ; Jacdbcea, insect- visi- 

 tors, 170 ; vulgaris, autogamy, 165 



Sepals, 162 



Service-tree. See Pyrus torminalis 



Shade-plants, 72, *73 



Sheep, 20 ; fat-tailed, 145 ; -runs, 

 257 



Shepherd's-needle, 216, 217 ; -purse 

 (see Capsella) 



Shirley poppy, origin of, 153 



Shoots : colour of young, 73 ; xero- 

 phytic forms of, 42 



Shore, sandy, veg. of, 279 



Shoreweed. See Littordla 



Shrubs, deciduous, 60, 109 



Silene: it., 187, *188 ; honey, 173 ; 

 acavlis, 38, 114 ; nutans, 174 



Silica, 82, 98 



Silicate of alumina, 81 ; lime, 81 ; 

 potash, 81 



Silicula, 188 



Siliqua, 188, *190 



Silverweed, 217 



Simethis, 214 



Sinapis, 148 ; arvensis, 216 



Sisyrinchium, 214 



Sleep-movements : in fls., 71 ; in 

 leaves, 70, *71 



Sloe. See Prunus spinosa 



Slopes, exposed maritime, veg. of, 

 284 



Slugs, 176 



Smilax, 212 ; tendrils, 119 



Snapdragon : fr., 187, *188 ; honey, 

 171 



Snowdrop, 57, 63, 214, 215 



Societies, plant, 225 



Soil, 8, 14, 80, 91; acids in, 88, 94; 

 aeration of, 87; aldehydes, 101; 

 animals in, 96; -bacteria, 83, 88, 

 95, 96, 123; biology of, 91; capil- 

 larity, 86 ; chemical properties, 80, 

 88; and climate, 14, 84; dry, 85, 

 87; -factors, 8, 18, 19, influence 

 on flora, 21, 84; forest-, 18; 

 formation of, 80; -fungi, 96, 

 133; nutriment in, 24, 33, 83, 

 90, 93; percolation of, 87; per- 

 meability of, 87; living popula- 

 tions of, 94; physical properties, 

 80, 85, 90; protozoa, 95; salt-, 

 33; sour, 33, 35, 88, 94; and 

 temperature, 87; influence on 



