INDEX. 



265 



Sphagnum-bogs, 208. 



Sphagnum-moors, 188. 



Spines, 146, 204. 



Spirogyra, 110. 



Spongy tissue, 39, 40. 



Spore case, 55, 118, 119. 



Spore-dispersaL 109, 111, 112, 113, 



114, 118. 

 Spores, 109, 110, 111, 112. 

 Spring beauty, 196. 

 Spring plants, 143, 144* 

 Squash seedlings, 50. 

 Squirting cucumber, 120. 

 Staghorn fern, 100. 

 Stamens, 78, 79, 80, 125. 

 Starch, 153. 

 Star cucumber, 61. 

 Star-of-Bethlehem, 81. 

 Stem. 54, 83, 139. 

 Steppes, 216. 

 Stigma, 80, 125. 

 Stipules, 35. 

 Stomata, 38, 40. 206. 

 Strawberry plant, 57, 58, 93. 

 Struggle for existence, 142. 

 Style, 80, 125. 

 Subterranean stems, 54, 55, 56, 76, 



77, 78. 

 Succulent plants, 222. 

 Sugar, 153. 

 Sundew, 158, 159. 

 Sunflower, 72. 

 Swamp-forest, 190, 191. 

 Swamps, 183, 187. 

 Swamp-thickets, 188. 



Tamarack, 178, 190. 

 Tap root, 93. 

 Taxus, 42. 



Teasel. 136. 



Telegraph plant, 49. 



Temperature, 145. 



Tendrils, 61, 62, 63. 



Thallus, 107. 



Thickets, 188, 224, 243. 



Thistle, 117. 



Thorns, 146, 204, 205, 206, 207. 



224. 

 Thuja, 139. 

 Tilia, 116, 201. 

 Tillandsia, 96, 101. 

 Toad-flax, 80. 

 Toadstools, 149. 

 Tobacco, 80. 

 Touch-me-not, 119. 

 Tragacanth, 206. 



Transpiration, 31, 33, 154, 193, 256. 

 Tropical forest, 254. 

 Tni m pet creeper, 99. 

 Tubers, 74, 76, 196. 

 Tumbleweeds, 117, 220. 

 Turf-building, 185. 



U 



Ulex, 205. 



Ulothrix. 109, 111. 

 Utricularia, 173, 174. 



Vallisneria, 184. 



Vascular bundles, 83, 84, 92, 9£ 



94, 107, 108, 151, 171. 

 Vegetative multiplication, 109. 

 Veins, 35, 36, 37, 40, 151. 

 Velamen, 99. 

 Venation, 35, 36, 37. 

 Victoria, 180. 

 Violet, 117, 119. 



