6o6 



INDEX 



Hammock (Florida), 352, 438 

 Hanging bog, 501 



— valleys, 546 

 Hanson, H. C., 335 



Hard Fern, see Blechnum spicant 



— water, 373, 478 

 Hardwood, 246, 268 



Hardy, M. E., 20, 355, 378, 471 



Hares, 363 



Harley, J. L., 46 



Harsh environment replacing competi- 

 tion, 381 



Harshberger, J. W., 282, 379 



Hashish, 267 



Haustorium {pi. haustoria), 89, 438 



Haviland, M. D., 16, 561 



Hawaii, 424 



— , native plants ousted by aliens, 118, 



Hawk, 115, 306 [221 



Hawthorn, see Crataegus monogyna 



Hay-fever, 264, 280 



Hayek, A., 23 



Hazel, see Corylus and C. avellana 



nut, 258 



Heard Island, 420 



Heart ailments, treatment of, 262, 263-4 



Heat, resistance to, see High tempera- 

 ture, tolerance of 



Heath, see Erica and Heathland 



Heathland, 330, 332, 358-9, 374. 45°- 

 541 



— , arctic, 392, 393, 394, 395, 409, 410 



— , mountain, 410 



Heaths, see Ericaceae and Heathland 



Hedera (Ivy), 89 

 H. helix (Ivy), 340 



Hedge, sprouting after clipping, 13 



Helbeck, H., 254 



Helianthemum, 173 



Helophyte, 505 



Hemi-epiphyte, 434 



Hemicryptophyceae, 528 



Hemicryptophyte, 93, 94, 95, 307, 360, 

 410 



Hemiparasite (semi-parasite), 437, 438 



Hemiphanerophyceae, 528 



Hemiplankton, see Pleuston 



Hemitrichia, 42 



Hemlock, see Tsuga and T. canadensis 



Hemp, see Cannabis sativa 



Hempseed oil, 235 



Henbane, 267 



Henna, 274 



Hepaticae (Liverworts), 49, 50, 51, 145, 

 422, 434, 462, 468 



— , fossil, 133. 145 



Herb {see also Forb, Cyperaceae, Grami- 

 neae, etc.), 11, 295, 308, 340, 341, 

 346, 356, 392,398,430 



— layer, 340, 341, 346, 430 



like Willow, see Salix herbacea 



Herbaceous crops and their areas, 223- 

 Herbalists, 262 [241 



Herbarium {pi. herbaria), 572, 573 

 Herbicides, 275, 276, 280, 579 

 Herbivores, see Mammals, etc. 

 Heredity, 64, 91, 175, 562 

 Heritable variation, 562, 564 

 Heritiera littoral is, no 

 Herons, 117 

 Hess, R. W., 243, 253 

 Hesse, R., 17 

 Heterogeneous area, 192 

 Heterospory, 57, 59, 135, 137 

 Heterotrophic organisms (heterotrophs) 



436, 496 

 Heterotrophy, 436, 496 

 Hevea (Para Rubber), 124, 272, 430 

 H. brasiliensis (Para Rubber), 121 

 Hickory, see Carya 



nut, 258 



Hierarchy of classification, 24, 91 

 Hierochloe alpina (Alpine Holy-grass), 



High-alpine meadow, British Columbia, 



412 

 vegetation, 409, 410, 411, 412, 



413. 414 



— altitudes, 10, 409-15 



, comparison with high latitudes, 



409 

 arctic belt or region, 171, 316, 382, 



387- 389- 395-9, 401, 409 

 community, unusually luxuri- 

 ant, 408 



heathland, 395 



— marsh, 387-9 



— temperature, tolerance of, 77, 87, 



495, 499 

 Highmoor, 359, 374, 462, 501 

 Hildbrandtia, see Hildenbrandia 

 Hildenbrandia, 496, 499 



H. rivularis, 498 

 Hill, A. F., xviii, 252, 281 



— Rice, 224 



Hillock tundra, 385, 387, 388 



Himalayas, 247, 295, 423, 424 



— , ' cold desert ' of, 414 



— , flowering at high altitudes in, 412, 



Hind, R. B., 17 [413 



Hippuris vulgaris s.l. (Common Mare's- 

 tail, Mare's-tail), 405, 406 



Historical elements, 211 



History, past, see Evolutionary develop- 

 ment 



Holard, 301 



Holdfast, 35, 36, 38, 39, 498, 528 



Holly, see Ilex aquifoliuni 



Holm Oak, see Quercus ilex 



Holocene period, 173 



Holttum, R. E., 471 



Homogeneous area, 192 



