360 



Index 



Terrestrial condition favora- 

 ble to evolution, 347 



Tertiary, flora of, 241, 247, 

 251, 254, 255 



Tetraphis, *35 



Thalictrum, 174 



Thistle, 173, 267, 288 



Tillandsia, 208 



Tobacco, 229, 282, 338 



Tomato, 341 



Toypn (Heteromeles), 274 



Trailing Arbutus (Epigasa), 

 257 



Tree-ferns, 117, 118, 262 



Treubia, *85 



Trichina, 78 



Trillium, 166, 269, 274 



Tropics, flora of, 252 



True Fungi (see " Eumy- 

 cetes") 



True Mosses (Musci), 94 



Trumpet creeper, 179, 234 



Trumpet honeysuckle, 234 



Tulip, 159, 166, 251 



Tulip tree (see also " Lirio- 

 dendron"), 242, 251, 256, 

 257 



Twin-leaf (see "Jefferson- 

 ia") 



Ulothricales, 67, 85 

 Ulva, 34, 57 

 Unicellular plants, 29 

 United States, flora of, 268 

 Utricularia (see " Bladder- 

 weed ") 



Vaccinium, 208 

 Variation, 23, 305, 306 

 Vascular Cryptogams (see 



" Ferns," " Pteridophytes " ) 

 Vascular system (see " Fibro- 



vascular") 

 Vaucheria, *73, 74 

 Venus's fly-trap (see "Di- 



onaea ") 



Vernonia, 247 



Violet, 251, 254, 262, 274 



Volvocales, 52, 53, 54, 66, 69, 



187, 188 

 Volvpx, 52 

 Vorticella, 12 



Walnut, 251, 269, 292, 339 

 Water-factor in plant growth, 



8, 39, 201, 202 

 Water-crowfoot, 41, 196 

 Water-lily, 163, 172, 227 

 Water-mold, 73, 74 

 Water-plantain (Alisma), 163, 



i?4 

 Water-shield (see " Cabom- 



ba") 



Weeds, 246, 288, 295, 318 

 Welwitschia, 143, 144, 184 

 Wheat, 281, 285 

 Wild Nutmeg (Torreya), 142 

 Wild oats, 275 

 Wild rice, 279 

 Willow, 154, 158, 160, 161. 



163, 171, 246, 250, 254, 338 

 Wintergreen (see " Gaulthe- 



ria ") 

 Wistaria, 270 



Xerophytes, 117, 198, 199, 201, 

 202, 203 



Yellow Jasmine (see " Gel- 



semium ") 

 Yucca, 164, 178, 221, 233; Y. 



filamentosa, 233 



Zizania (see "Wild Rice") 



Zoophytes, 14 



Zoospores, 21, 28, 45, 54, 62, 



65, 68, 74, 222 

 Zostera (see "Eel-grass") 

 Zygote, 54, 68, 90, 91 

 Zygomorphy, zygomorphic 



flowers, 167, 176, 177, 309 



