INDEX 



261 



Sporangium, 160, 173 



Sporophyll, 162 



Sprouting, 7, 10 



Stamen, 54, 61, 123 



Starch, 106 



Stems, 4, 31-33, 35, 38, 47, 93, 



98, 121 

 Sterculia, 193 

 Sterculiacese, 193 

 Stigma, 62 

 Stomata, 38 

 Style, 62 



Sugar, 107, 116, 232 

 Sunflower, 216 

 Sunlight, 46 

 Sweet potato, 218, 240 



Tannins, 108 

 Temperature, 130 

 Thallophytes, 169 

 Theobroma, 193 

 Tobacco, 220 

 Tomato, 220, 239 

 Torus, 54 



Transpiration, 113, 114 

 Trees, 135-137 

 Trichomes, 25, 103 

 Triticum, 229 

 Tropophyte, 128 

 Turnips, 188 



Ulmus, 224 

 Ulothrix, 171 



Umbel, 65 

 Umbilliferse, 215 

 Urticaceae, 223 

 Uses of plants, 183 



Vacciniaceae, 217 

 Variations^ 147 

 Vaucheria, 171 

 Veins, 48 

 Vine, 196 

 Violaceae, 189 

 Violet, 189 

 Vitaceae, 196 

 Vitis, 197 



Walnut, 225, 235 



Warmth, 8 



Water, 15, 16, 105, 112, 114, 126 



Weeds, 150, 239 



Wheat, 229, 237 



Willow, 227, 236 



Wood, 100 



Xerophytes, 128 

 Xylem, 98 



Yam, 218 

 Yeast, 172 



Zea, 231 



Zingibraceae, 227 

 Zoospores, 171 

 Zygospores, 171 



