234 
scrub on sandstone, 99 
scrub on shale, 99 
siliceous grassland, 127 
siliceous soils, 14 
sub-Alpine grassland, 193 
swamps on limestone, 152 
transitional moors, 187 
transitional moorland and grass- 
land, 181 
Sphagnum (see also Bog Moss), 184 
Moors, 166 
in peat, 184 
Stable plant associations, 20 
Strata of the District, Geological, 12 
Streams, Bryophytes of, 157 
Vegetation of quickly flowing, 155 
Structure of moorland plants, 145, 
174 
Sub-alpine grassland, 104, 105, 193 
Sub-associations of plants, 19 
Subformations of plants, 19 
Subordinate plant associations, 21 
Succession, 20, 94, 193 
Succession of forest to scrub, 91, 94 
grassland to heath, 122, 214 
grassland to moorland, 94, 114, 
115, 181, 217 
moorland to grassland, 186, 193, 
217 
moorland plant associations, 188, 
217 
scrub to grassland, 94, 115, 133, 
217 
woodland to grassland, 114, 217 
woodland to scrub, 94, 97, 115, 
133, 214, 217 
Summary of British plant formations 
and associations, 218 
Summary and relations of plant com- 
munities of the Peak District, 
214 
Swamp xerophytes, 145, 174 
Swamps, Juncus, 149 
Swamps or marshes of the limestone, 
152 
sandstones and shales, 146 
Swamps, Reed, 154 
Sycamore, 51, 68 
Temperature, 26, 28 
Thickets, Alder-willow, 58 
Toadstone, 9 
Transitional associations, 183, 186 
calcareous grassland, 122 
grassland and moorland, 181, 186 
moors, 166, 187 
moorland associations, 183, 187 
siliceous grassland, 186 
woods of Quercus Robur and 
Q. sessiliflora, 45 
INDEX 
Trees, altitudinal limit of, 38, 88 
Trees and shrubs of ash woods, 69 
oak woods, 47 
Tufa, 13 
Turnips, 205 
Types of grassland, 104 
scenery, 3 
‘*Ubergangsmoor,” 170 
Universal names in phytogeography, 
19, 61, 95 
Unstable associations, 20 
Uncultivated land, Reclamation of, 
201 
Upper atmosphere, 27 
Utilization of the peat moors, 213 
waste land, 23 
Vacciniétum myrtilli, 182, 216 
Vaccinium edges, 182 
Myrtillus (see Bilberry) 
ridges, 182 
Value of Vegetation Maps, 22 
Variation of vegetation in oak woods, 
53 
Vegetation and soils, 12, 13 
Flora and, 16 
Vegetation maps, 18 
and floristic maps, 22 
Construction of, 18 
Value of, 22 
Vegetation units, 17 
Velocity of the wind, 32 
Vernacular names in plant geography, 
Volcanic rocks, 9, 12 
Water in the peat, 173 
Water of the moors, 173 
Waters, Acidic, 37, 39 
Alkaline, 37, 39 
Basic, 37, 39 
Calcareous, 150 
Non-calcareous, 146 
Plant formation of fresh, 217, 
218 
Weeds of arable land, 207 
Wheat cultivation, Altitudinal limits 
of, 205 
Willows, 48, 70 
Wind, Velocity of the, 32 
Woodland associations of Great Britain, 
39 
of the Southern Pennines, 40 
Woodland, Altitudinal limit of, 44 
Degeneration of, 91, 94 
Distribution of, 38 
Woodland plants, Comparison of, 74, 
79 
Woodland species, 79 
