INDEX 



639 



Willis, J. L., 379 

 Willow, see Salix 



herb, see Epilobitim 



Wilson, J. W., xvii 



Wind, lo, II, 291, 292, 293, 359, 415, 



419, 420, 441 

 break, 277, 307, 555 



— -caves, 547 



— -climate, 293 



— as climatic factor, 291-3 



— , dispersal by, 27, 98, 99-103, 104, 

 105, 106, 293, 434, 490 



, barriers to, 103, 103-6 



— , effect on plants, 291, 292, 293, 359 

 — , erosion by, 291, 543, 547-50 



— -transport, 27, 99-106, 434 

 Wine, 260, 261 



Winged fruits, 102, 104, 105 



— seed, loi, 102, 104, 105 

 Winter, 11-12, 288, 361, 380 



— aspect, 338, 340, 341, 350, 351 499 

 forms, of seaweeds, 531, 532 



— , plants and, 288, 289, 361 

 Wintergreen, 260, 262 

 Wisconsin, 341, 485, 486 

 W^itch-hazel, see Hamomelis 

 Wood (timber), 267-8, 271, 274 



— alcohol, 268 



— Anemone, see Anemone ueinorosa 



— Avens, see Geiun urbanum 



— , destructive distillation of, 268 



— Forget-me-not, see Myosotis syl- 



vatica 



— gas, 268 



— pulp, 269, 270 

 rush, see Luzula 



— -sorrel, see Oxalis and O. acetosella 

 Woodbury, A. M., 31?. 



Woodland, 16, 332-3, 343, 354-8, 541, 

 — , hydrophytic, 325 [557 



— vegetation, stratification in, 291, 338, 



339 351.425.426,440,468,469 

 Woody climbers {see also Lianes), loi, 



— crops, 242-7 [340 



— plants of deserts, 366, 450-2 

 , dwarf, 386, 392-5, 413 



of Greenland, 222, 344, 390, 391 



— vegetation, browsing and, 307, 308 

 World, age of, 128 



— , annual precipitation (rainfall etc.) 



map of, 290 

 — , biological spectrum of, 95 



— Crops Books series (L. Hill), ii, 282 

 — , distribution of Man in, 256 



— , floristic regions of, 19 

 — , forest areas in, 213, 243, 246, 247, 

 556 



— production. Barley, 229 



, Cane and Beet Sugar, 241 



, Cocoa Beans, 244 



, Coffee, 245 



World production. Cotton, 235, 237 



, Flax-seed, 236 



, Maize, 229, 230 



, Oats, 229 



, Peanut, 238 



, Potato, 229, 232 



, Rice, 225, 229 



, Rye, 228, 229 



, Tobacco, 240 



, Wheat, 227, 229 



— , soil groups of, 300 



— temperature maps, 286, 287 

 — , vegetation-types of, 378, 556 



— , zoogeographical realms of, 18, 19 



Wormseed, 263 



Wormwood, see Artemisia 



Wrack, see Fucus 



Wright, Miss C, xix 



— , J. K., 253 



Wulff, E. v., 21, 23, 180, 212, 222, 252 



Wyatt-Smith, J., 456 



Wynd, F. L., 74 



Xanthoria parietiiia, 532 

 Xerarch subsere, 324 

 Xeric grassland, 413 



— mean, 328 

 Xeromorphic Pryophytes, 434 



• — plants, 82, 83, 289, 420, 451, 452 

 Xeromorphy, 343, 366, 420, 432, 442, 



443. 447. 452, 469 

 Xerophilous epiphyte, 432, 433, 434, 442 



— Sedges, 385, 386 

 Xerophily, 441, 442, 444, 452 

 Xerophyte, 289, 364, 450, 451 

 Xerosere, 324, 325, 327, 372, 407, 464 



Yam, see Dioscorea 

 Yautia, 258 



Yeast, see Saccharomyces 

 — , Food, 259, 270, 278 

 Yeasts, see Saccharomycetaceae 

 Yellow Archangel, see Galeobdolon 

 luteum 



— Marsh Saxifrage, see Saxifraga liir- 



ciihis agg. 



— Mountain Saxifrage, see Saxifraga 



aizoides agg. 



— Pine, 246 



— snow, 490 



— Water-lily, see Niiphar lutea 

 Yew, see Taxus baccata 

 Ylang-ylang, 275 



Yoco, 260 

 Yucca, 447 



Zea mays (Maize), 70, 71, 226, 229, 233, 

 257, 261, 269, 563 



■ , history of, 226, 229 



■ , world production of, 229, 230 



Zeuner, F. E., 129 



