INDEX 



265 



Targionia, 173 



Taxodium, 170 



Tectoria cicutaria, 14, i6 



Teneriffe, Peak of, 161 



Tern, arctic, 151 



Thallophytes, 130 



Thomson, J. Arthur, 48 



Thyrsopleris elegans, 11 



Tierra del Fuego, 149 



Time, distribution of plants in, 192 

 distribution of plants in geo- 

 logic, 193 

 table of geological, 190 

 the element of geological, 241 



Toad-stools, 80 



Todea barbara, 11 



Trajispiration, 8 



Trapa natans, 226 



Tree ferns, 3 



Tree, hypothetical ancestral, 137 



Treubia insignis, 174 



Triticum vulgare, 224 



Twin-flower, 121 



Unconformity, 189 

 Unit-characters, character-units 



versus, 65 

 Urtica dioica, 163 

 Utricularia, 196 



Vallisneria, 196 

 Variation, 4r, 93 



and inheritance, fluctuating, 

 108 



continuous, 103 



curves of, 109 



discontinuous, 108 



Variation, fluctuating, 103, 106 

 illustrations of continuous, 104 

 two kinds of, 103 



Variety, constant, 223 

 eversporting, 223 



Vascular plants, 8 



Venus fly trap, 179 



Visctim album, 96 



Vries, Hugo de, 74, loi, 102 



Walking fern, 15, 17 



Wallace, Alfred Russell, go, 166 



Wanakena, 186 



Warming, 145 



Water, dispersal by, 149 



Water buttercup, 86, 87 



Water lily family, 171 



Weismannism, 74 



to Mendelism, Relation of, 76 

 West Indies, 146 

 White Mountains, 160 

 White pine, 53 

 Wides, r77 

 Wielandiella, 220 

 WiesnereUa Javanica, 174 

 WUUamsonia, 214, 220 



mexicana, 219 

 Willow, 32 



Wind, dispersal by, 143 

 Wolffia papidifera, 8i 



punctata, 81 



Zamia, 2x5, 232 

 Zea Mays, 69, 223, 224 

 Zelkowa, 167 

 Zygospore, 51 

 Zygote, 32, 33 



