INDEX. 



737 



Tremellales, 218, 219 

 Triadelphous, 425 

 Trichodesmium erythraeum, 622 

 Trillium, 318322, 648, 656, 703 

 Trillium grandiflorum, 520 

 Tropical forests, 541 

 Tropophytes, 485, 493, 494 

 Trumpet -creeper, 711 

 Tuberales, 217 

 Tubers, 373 

 Tumbleweeds, 507 

 Tundra, 516, 578 

 Tupelo gum, 538 

 Turgescence, 14, 15 

 Turgor, 20; restoration of, 56, 57 

 Typha, 606, 625, 702 



Ulmaceae, 672, 704 



Ulmus americana, 672, 673, 704 



Ulothrix, 162 



Ulotrichaceae, 162 



Ulvaceae, 162 



Umbel, 428 



Umbellales, 692, 708 



Umbelliferae, 692, 708 



Uniola paniculata, 599 



Upland forest, 537 



Uredinales, 218 



Uredineae, 187-194, 218 



Uredospore, 189 



Uromyces caryophyllinus, 87 



Urticales, 672, 704 



Ustilaginales, 218 



Ustilagineae, 218 



Utricularia, 610, 711 



Vaccinium, 709 

 Vacuoles, 7, 8 

 Valerianales, 711 

 Vallisneria spiralis, 492, 702 

 Variation, 338 

 Vascular tissue, 358, 363 

 Vaucheria, 142-146, 626 

 Vaucheriaceae, 162 

 Vegetation elements, 497 

 Vegetation formations, evolution of, 



605, 606 



Vegetation forms, 525 

 Vegetation of hot springs, 624; of 



rocky places, 600-606; of swamps 



and moors, 606-61 5 ; of the strand, 



586-599 

 Vegetation regions of the earth, 638- 



641 



Vegetation types, 464, 465, 482, 496 



Venus' flytrap, 133, 611 



Verbascum, 710 



Verbena, 710 



Vernal flora, 562 



Vessels, 52, 53 



Vetch, 92, 707 



Viburnum, 711 



Vicia sativa, 459 



Viola cucullata, 436, 687 



Violaceae, 687, 708 



Violet family, 687 



Virgin's-bower, 462, 463 



Vitaceae, 707 



Volvocacese, 158 



Walnut, 452, 704 



Water, 465; flow of, in plants, 53, 54 



Water-fern, 627 



Water-lilies, 606, 625, 627, 705 



Water-plantain, 702 



White pine, 396 



White sage, 572 



Wild carrot, 691, 708 



Willow family, 667, 704 



Willows, 595 



Wind, 471 



Wintergreen, 709; leaf of, 43 



Witch-hazel, 706 



Wolffia, 28 



Wood-destroying fungi, 553-555 



Woodland formation, 516, 526, 529 



Xerophytes, 483, 485, 5 6 5> 59-599> 



618 



Xerophytic structures, 487, 495 

 Xerophytic vegetation, 590, 594 

 Xylem, 50, 52, 360, 361, 363 

 Xylogen, 92 

 Xyridales, 703 



Yeast, 216; fermentation of, 115, 1 16 

 Yucca, 394, 560, 569-572, 703 



Zamia, 313, 316, 457 



Zannichellia, 627 



Zones, 525; of water vegetation, 625 



Zoogonidia, 143, 149, 178-184 



Zoospore, 149, 154 



Zostera, 628 



Zygomycetes, 215 



Zygospore, 2, 138-140, 157, 1 60, 179, 



180 

 Zygote (zy'gote), 138, 179 



