544 



PEACTICAL BOTANY 



Superior ovary, 113 



Suspensor, 327* 



Swamp lands, 436, 438 



Sweet pea, flower of, 109*, 354* 



Sweet pea, fruit of, 354* 



Sweet potato, sprouting of, 33* 



Switch plants, 39 



Sycamore wood, section of, 392* 



Symbiosis, 35-37, *372-375 



Symmetry, 108, 109* 



Sympetalous, 110 



Sympetalous dicotyledons, *363- 

 370 



Synergids, 325 



Synsepalous, 110 



Syringa (Philadelphus) leaves, ar- 

 rangement of, 55* 



Systematic botany, 159 



Taproot, 143* 



Tar, 316 



Taxodium, 29* 



Taxonomy, definition of, 159 



Tea, 360* 



Teleutospores, 243 



Temperature and germination, 139, 



140 



Tendril, 61*, 62* 

 Tendril climbers, 61*, 62* 

 Terminal bud, 92* 

 Terminal flowers, 518*, 519 

 Terrace farming, 444, 446 

 Testa, 136* 

 Thallophytes, classification of, 187, 



212, 225, 256 

 Thallophytes, evolution of plants, 



159, 330, 334 



Thickening of stems, 50*, 51, 52 

 Thistle, Russian, 148 

 Thuja, 310*, 313* 

 Tillage, 439 

 Tillandsia, 489*, 490* 

 Timber, *390-397 

 Timber line, 506*, 507* 

 Timber supply, 396, 397 

 Timothy, pistil of, 119* 

 Timothy, variation in, 413 

 Tissue, 11, 12 

 Toadstool, 240, 247-252 

 Tobacco, 366 

 Tolerant and intolerant trees, 399, 



400 



Tomato, 366 

 Toxins, 172 

 Tracheids, 48*, 390* 



Transition from stamens to petals, 



105* 



Transpiration, 18, *482-487 

 Transpiration, amount of, 18 

 Transplanting, 452 

 Transportation by water, 155 

 Tree ferns, 276* 

 Tree planting, *403-405 

 Trees, 6*, 26, 29*, 32*, 42*, 43*, 44, 



51-53. See also Forestry 

 Trillium, 344* 

 Trypsins, 145 

 Tube nucleus, 116* 

 Tuber, 73 



Tubercles on roots, 36, 37 

 Tuberculos's, 162, 171, 174, 175, 176 

 Tumbleweeds, 475* 

 Turgidity, 9-11 

 Turgor, 9-11 

 Turpentine, 314*, 316 

 Twigs, fall of, 66 

 Twiners, 60*, 61 

 Typhoid, 162, 164, 172, 174, 177 



Ulothrix, 196*, 197 

 Ulva, 204 

 Umbel, 516* 

 Umbellet, 517* 

 Underground stems, *72~77 

 Union of carpels, 112 

 Union of stamens, 110, 111 

 Unisexual flowers, 106*, 107* 

 United States, plant geography of, 



*503-513 

 Uredospores, 243 

 Usnea, 236, 237, 496* 

 Ustilago, 240 



Vaccination, 172 



Vacuole, 189 



Variation, 412-414, *417-421, 425, 



*428-430 

 Variety, 412 



Vaucheria, 195, *198-201, 215 

 Vegetative reproduction, 33*, *82- 



89, 187 

 Vein, 10* 



Venus' s-fly trap, 387* 

 Vernal grass, 337*, 338* 

 Vessel, 46* 

 Victoria, 67* 

 Vilmorin, Louis, 424 

 Violets, cleistogamous flowers of, 

 . 134* 

 Virginia creeper, 61*, 380 



