274 
Stem, structure of, 52-64. 
Stigma, 144, 146. 
Stigma, structure of, 156, 157. 
Stinging hair, 129, 209. 
Stipules, 90. 
Stomata, 109, 110, 115, 114. 
Stone-fruit, 191, 193. 
Storage of food in the stem, 72, 73. 
Strawberry, 195. 
Struggle for existence, 197-205. 
Sugar, formed during germination, 
10. 
Sundew, 104, 105. 
Survival of the fittest, 211, 212. 
Style, 146. 
Sugar, 75, 76. 
Suture, 184, 187. 
Sweet pea, flowers and fruit, 177, 
178. 
Symmetrical, 143, 144. 
Tangential section, 56. 
Taper-pointed, 87. 
Taproot, 30. 
Tegmen, 5. 
Temperature, relation to germina- 
tion, 7. 
Tendril, 46. 
Tendril climbers, 46. 
Terminal flowers, 156. 
Terminal bud, 81. 
Testa, 5. 
Thallophytes, 216. 
Thistle, Russian, 201, 202, 205. 
Three-ranked, leaves forming three 
rows up and down the stem, as in 
sedges. 
Tickle-grass, 201. 
Tissue, 58. 
Tomato, study of, 182. 
INDEX. 
Transition from stamens to petals, 
152, 153. 
Transpiration, 113-116. 
Tree, 43. 
Trillium, study of flower of, 137, 
138. 
Trimorphous flowers, 1753. 
Tropzolum leaves, starch in, 121. 
Truncate, 86. 
Trunk, 41, 42. 
Tuber, 47. 
Tulip, study of flower of, 139, 140. 
Twiners, 46. 
Two-ranked, leaves forming tw) 
rows up and down the stem, as in 
grasses. 
Types of flowerless plants, 219- 
245. 
Types, order of appearance of, 
217. 
Umbel, 132. 
Umbellet, 135. 
Underground stems, 46-48. 
Unicellular plants, 219, 220. 
Union of pistils, 147. 
Union of stamens, 147. 
Urns of mosses, 236. 
Urn-shaped, widened at the bottom, 
with a narrower mouth, like the 
corolla of the bearberry, Fig. 
148, V. 
Vacuole, 227. 
Variety, 214. 
Vegetable physiology, 2. 
Vein, 90. 
Venation, 90, 91. 
Ventral suture, 184. 
Venus’ flytrap, 106. 
