458 



GENERAL BOTANY 



Tetrads, 81, 290* 



Tetrads in lily, 343* 



Tetrads in Ricciocarpus, 290* 



Thallophyta, 287 



Thallus, 287 



Thistle, 413 



Timothy, variation in, 204* 



Tobacco, Connecticut broad-leaf, 197* 



Tobacco, Uncle Sam Sumatra, 198* 



Tolerance in forest trees, 372, 373* 



Tracheae, 93 



Tracheids, 304, 327, 328* 



Tradescantia (spiderwort), 417* 



Trama, 270 



Transpiration, 127*, 142-146 



Transpiration, control of, 143 



Trees, erect type, 19, 20* 



Trees, form and development of, 19 



Trees, growth and bark formation, 



102 



Trees, hardwood, 380 

 Trees, importance and use of, 366 

 Trees, long and transverse sections 



of, 101* 



Trees, longevity of, 103 

 Trees, physiology of, 104 

 Trees, poplar, 389* 

 Trees, responses to stimuli, 43* 

 Trees, shrubs, and forests, 366 

 Trees, spreading type, 21*, 22, 43* 

 Trees, structure and physiology of, 



100-105 



Trees, sugar maple, 390*, 391* 

 Trees, white elm, 393*-395 

 Trees, white oak, 383*, 387 

 Trees, willow, 387*-389 

 Trees and forests, 366-380 

 Trifolium pratense, 37, 39* 

 Trifolium pratense, pollination of, 172 



173 



Trimorphic flowers, 362 

 Tropisms, 23, 27 

 Tropophytes, 150 

 Tube cell, 334* 

 Tube nucleus, 164*, 347* 

 Tubers, 354 



Tubers of potato, 156*, 334 

 Turnip, 401 

 Twig, lilac, 69*, 84* 



Ulmaceae, 393-396 



Ulmus Americana, 392*, 395* 



Ulmusfulva, 393, 335* 



Ulmus racemosa, 393 



Umbel, 358* 



Undulate leaf margin, 355* 



Urediniospores (uredospores), 274, 



275* 

 Ustilago zeae, 276, 277* 



Vacuoles, 47*, 52 



Variation, fluctuating, 197 



Variation, summary, 206 



Variation in apples, 192* 



Variation in corn, 194* 



Variation and selection, 192 



Variation in timothy, 204 



Variation in tobacco, 197 



Vascular cylinder in Salvia, 105, 106* 



Vascular plants, 299* 



Vascular system of fern, 301*, 302 



Vaucheria, 230-233 



Vaucheria, asexual reproduction in, 



233* 

 Vaucheria, sexual reproduction in, 230, 



231*, 232* 



Vegetation, instability of, 444 

 Vegetative reproduction, 154-159 

 Vegetative reproduction in fern, 158* 

 Vegetative reproduction in gladiolus, 



157* 

 Vegetative reproduction by leaves, 



157, 158* 

 Vegetative reproduction in plantain, 



156* 

 Vegetative reproduction in potato, 



156* 

 Vegetative reproduction in raspberry, 



155* 



Vegetative reproduction by roots, 158* 

 Vegetative reproduction by stems, 154, 



155*, 156*, 157* 



Vegetative reproduction in straw- 

 berry, 155* 

 Vegetative reproduction in sweet 



potato, 158* 



Vegetative reproduction in tulip, 157* 

 Veil, 268 



Veins of leaf, 113*, 115*, 116 

 Venation of leaves, 355* 

 Venter of archegonium, 289* 

 Ventral-canal cells, 289* 

 Viciafaba, 34 



Violapinnata, flower structure of, 402* 

 Violaceae, 401*-403 

 Violet flowers, 401*, 402* 

 VonMohl, 55, 56 



Walking leaf fern, 158 



Water, ecological relations of plants 



to, 146-153 

 Water, relation of plants to, 137-153 



