172 
Size, increase in, how brought 
about, 18-9 
Sleep, 24-5, 112-3 
Sloe, bloom on fruit, 24 
Slugs, food of, 33, 102-3; in 
captivity, 103 
Small Dovesfoot (Geranium 
pusillum). See Dovesfoot 
Small Scabious. See Scabious 
Smut, 26, 107 
Snails, food of, 
dispersers, 126-7 
Snapdragon, closing of fruit, 67 
Snowdrop, pores, 10, 11; rest, 
4 
33, 102-3 ; 
0 
Sorrel, Wood. See Wood-sorrel 
Sparrow, disperser, 125 
Speedwell, galls, 106 
Spiders’ webs, dispersers, 127 
Spines, weapons of defence, 27 ; 
Gorse, 34 
Spinning seed of Pine, 66 
Sprengel, Conrad, insect pollina- 
tion, 139 
Spring-flowering, advantage of, | 
38-9 
Spurge, Petty, starch grains, 16 ; 
latex, 31, 34; seedling, 
competition between the seed- 
lings, 35; dispersal, 74-6; 
Sun, dispersal, 75 6 
Squirrels, dispersers, 74 
Stamens, producers of pollen, 
45; parts of, 46; separate, | 
coherent and adherent, 47; 
Herb Robert, 113, 115-6; | 
Storksbill, 146, 148 
Starch, as food, 15; Petty | 
Spurge, 16; manufactured by | 
leaf of Herb 
plants, 16-7; 
stem of Herb 
Robert, 97; 
Robert, 113 
Stigma of various plants, 45; 
maturing, 52-3; Herb Ro- 
bert, 114-6; Storksbill, 149 
Stinging hairs, Viper’s Bugloss, 
27; Nettle, 28 
Stinking Robert, 90 
Stitchwort, seed-sculpture, 81 
Stock, abundance of seeds, 32; | 
dispersal, 65 ; germination, 80 
) 


31; | 

INDEX 
Stonecrop, Yellow, pistil, 46 
Storksbill, seed-sowing, 85; 
hygroscopic fruits, 124; life- 
history, 146-52 ; shade plants, 
149; fungi, 152; seedlings 
and snails, 152; pollination 
modes, sun and shade flowers, 
162; seed-throwing, 163 
Streams, dispersers, 69 
Struggle for existence, 109 
Style, of various plants, 
Herb Robert, 114 
Suckers, Rose, 44 
45; 
- Sulphur, 12 
Summary, Herb Robert and 
relatives, 153-7 
Sunflower, coherent stamens, 47 
Sun Spurge. See Spurge 
Sweet Violet. See Violet 
Sycamore, wing of fruit, 66 
1h 
Tannin, Herb Robert, 106 
Taproot, Herb Robert, 132-3 
Tendrils, White Bryony, 38 
Thistle, dispersal, 65 
Threads, seed of Herb Robert, 
123-9, 153, 163; value of, 
in dispersal, 123-8; in seed 
sowing, 128-9 ; absence, 
shingle variety. 132-5 
Thrips, on Herb Robert, 119 
Toadflax, Yellow, dispersal, 65 ; 
Ivy-leaved, seed-sculpture, 81; 
self-sowing, 82-3; number 
of seeds, 84; seedlings’ 
struggle for survival, 84 
Tree-creeper, disperser, 125 
| Tuber, Potato, 44 
Tulip, pollination, 52 
Turk’s Cap Lily. See Lily 
Twining, Bindweed, Black 
Bryony, Hop, 37-8 
U 
Underwing, Yellow. See Yellow- 
underwing 
