INDEX 
Taper-pointed, *131. 
Taproot, *41. 
Teleutospores, *262. 
Temperature and root-absorption, 
55, 56. 
Temperature, relation to germina- 
tion, 9. 
Tendril, *138. 
Tendril climbers, *74. 
Terminal bud, 63, 121, 122, *124, 
*125, 
Terminal flowers, 186, *191. 
Tertiary root, 36. 
Testa, 6. 
-Tetraspores, *255. 
Thallophytes, 232, 235-275. 
Thallophytes, study of, 287-273*. 
Thallus, 235, 250. 
Thermostat, 9. 
Thistle, Russian, *579, 394. 
Thorns as branches, 68, *69. 
Thyme, stoma of, *153. 
Tickle-grass, *381. 
‘‘ Timber line,’’ *329, *330. 
Tissue, 94, 95. 
Tomato, study of, 217. 
Tracheids, 92, 95, *94. 
Transition from stamens to petals, 
*209. 
Transpiration, 156. 
Transpiration, amount of, 164, 165. 
Transpiration, measurement of, 
159, *160, 161. 
Transportation by water, 380, 381. 
Trees, 69. 
Trees, age of, 71. 
Trillium, study of flower of, 192, 
193. 
Trimorphous flowers, 367. 
Tropzolum leaf, *152. 
Tropzolum leaves, starch in, *170. 
411 
Tropzolum, petiole, coiling of,* 75. 
Tropical vegetation, 324, 325. 
Tropophytes, 311, 318, 319. 
Truncate, *151. 
Trunk, *66, *67. 
Tuber, 76, *78. 
Tubercles on clover roots, *339. 
Tubular corolla, *203. 
Tulip, study of flower of, 194, 195. 
Tumble-weeds, 378, *379, *380. 
Turgescence, 184. 
Turnip, seedling, *52. 
Twayblade, beetle on flower of, 
*359. 
Twigs, study of, 62-64. 
Twiners, 74, *75. 
Twining, rate of, 74, 75. 
Types, order of appearance of, 
298-305. 
Umbel, *187. 
Umbellet, 190. 
Underground stems, 75, *76, *77, 
*78, *79. 
Uneatable plants, 348. 
Union of pistils, 202, 203. 
Union of stamens, 201, 202. 
Uredospores, 261, *262. 
Usnia, *271. 
Vacuole, contractile, 180. 
Variety, 229, 230. 
Vaucheria, study of, 245, *246, 
247. 
Vegetable physiology, 1. 
Vegetation, alpine, 328, *329, *330, 
*331. 
Vegetation, aquatic, 332, 333. 
Vegetation, arctic, 327, *328. 
Vegetation, regions of, 324. 
Vegetation, temperate, 325, 326. 
