464 



INDEX 



vacuole, 73, 74 



Vallisneria, 304 



valve (of pod), 331 



variation, 149, 206, 276, 277, 446 



vascular bundles, 82, 83, 165, 413 



vascular cylinder, 81, 138 



vascular plants, 413 et seq. 



vascular system, 138, 416, 419 



Vaucheria, 370 



veins, 53, 83, 84, 240 



venation, 204, 416, 417 



Venus' fly-trap, 253 



venter, 398, 399 



vernal habit, 161 



Veronica, 298 



Victoria regia, 215 



villuses, 136 



violet, 56, 65, 276, 314, 320 



violet family, 314 



Virginia creeper, 251 



vitality of seeds, 339 



W 



wasp, 316, 318 

 water culture, 348 

 water dispersal, 355 

 water ferns, 415 

 water hemlock, 206 

 water in plants, 220, 224 

 waterleaf, 296 



water lily, 156, 215, 235, 251, 273, 285, 



287, 34 

 water roots, 128 

 wheat, 16, 18, 47, 136, 139, 147, 149, 220, 



322, 339, 34, 341, 345, 347, 3?8, 



387 et seq. 



wheat rust, 378, 387 et seq., 391 

 white rust, 386 

 whorl, 271, 294 

 willow, 49, 1 88, 205, 264, 284 

 wind dispersal, 353 et seq., 379, 401 

 wind pollination, 283, 307 

 winter buds, 185 

 winter spores, 388, 389 

 wood, 77, 138, 346 

 woodbine, 154 



X 



xanthophyll, 247 

 xenogamy, 305 



xylem, 79, 80, 83, 138, 147, 165,241, 4i7 : 

 419 



yarrow, 300 



yeast, 345, 374 



yucca, 172, 314, 315, 316 



zoospore, 366, 367, 369 

 zygomorphic flowers, 287, 288, 313 



