308 
Indian corn. See Zea Mais 
Indigenous plants, 215 
Inflorescences, 178 
Insectivorous plants, 129, 131 
Insect-pollination, 167 
Insects, adaptation to fls., 168, 178 
Integument, *163 
Interdependence of pl. and animal 
life, 79 
Intoxicating drinks, 151 
Inula salicina, 214 
Ireland : alpine veg. of west of, 286, 
288 ; flora of, 213, 214 ; pls. absent 
from, 214 
Iris : aril (fetid iris), 196 ; fr., 187, 
*189; honey, 172; pollination, 
177; rhizome, 154; seed, 146; 
mesophytic chars. of, 31; xero- 
phytic chars. of, 31, 46 
Irrigation, 18 
Islands : flora of, 207 ; origin of, 207 
Isoétes, 50 
Ivy, 29; climbing pl., 119; honey, 
172; leaf-mosaic, 68, *69. See 
Hedera Helix 
Ivy-leaved toadflax, 216 
Jacob’s-ladder, 217 
Jasione montana, 60 ; insect-visitors, 
170 
Juncoid type of leaf, 43 
Juncus-bog, 231, 246 
Juncus bufonius, 59 
Juniper, 36 ; leaf, 42 ; seeds, 196 
Key, 186, 190 
Killarney fern, 29, 214 
Knight, Robert, on self-fertilization, 
165 
Kohlrabi, 111, *112 
Labiate, fr., 191 ; honey, 173 
Laburnum seeds, 138 
Lactuca, latex, 142. See Lettuce 
Lacustrine deposits, 80 
Lady’s-fingers, 217; -smock, 217; 
-tresses, 217 ~ 
Lakes: veg. of highland-, 238 ; veg. 
of lowland-, 236 
Land-plants, 28; growth-forms of, 
114 
Larch, 22 ; -wood, 274 
Larkspur: fr., 188, *189; pollina- 
tion, 174 
Latex, 142 
Lathrea;: parasitic habit of, 126, 
*127 ; water-glands of, 127 
| 
BRITISH PLANTS 
Lathyrus tendrils, 118, *120 
Latitude, 10 
Laudanum, 152 
Laurel, 23, 39, 212; extra-floral 
nectaries, 173 
Lavender, essential oil, 143, 151 
Law of population, 202 
Leaf : -fall, 60, influenced by pruning, 
109, and coppicing, 109; erect-, 
46; -modifications, 38; -mosaic, 
45, 68; position in xerophytes, 
46; -scars, 62; shade-, 72, *72; 
-spines, 140, *141; sun-, *72; 
-types in aquatics, 50, in xero- 
phytes, 42 
Leaves: colour of young, 73; cur- 
rent-, 235; edible, 150; fixed 
light-position of, 69 ; floating-, 49, 
51; heliotropism of, 68; sleep- 
movements in, 70, *71 
Legume, 188, *189 
Leguminose : fr., 188 ; honey, 173 
Leguminous crops, 98 ; pls. : protein 
of, 147, root-nodules of, 95 
Lemna, 55, 56 ; roots, 49 
Lemon, 143, 151 
Lenticels, 140 
Lentils, 147 
Lepidium ruderale, 60 
Lepidoptera, 170, 174 
Lepidopterous flowers, 170 
Lettuce, 150. See Lactuca 
Lianes, 121, 267 
Lichen-flora, 22 
Lichens : epiphytic, 121 ; habitat of, 
133 ; symbiosis of, 132 
Light: in relation to aquatics, 52 ; 
composition of, 66; source of 
energy, 4, 65; effect on growth, 
36, 71, 72, 115, 120; effect of 
intensity on veg. of woods, 266, 
269, 270, 272, 274; -position of 
leaves, fixed, 69, in xerophytes, 
46 ; effect on transpiration, 34, 45 
Lignified tissue, 41 
Lilac: bud-scales, 61; infl., 179; 
suckers, 155 
Lily, 63, 72; repr., 15; tiger-, repr. 
by bulbils, 160 ; of the Valley, 214 
Lime-tree : bud-scales, 61 ; fr., 194; 
honey-dew, 134 ; insects on leaves 
of, 144; leaf, relation between 
form and function, 103 
Lime: bicarbonate, 89; carbonate, 
89 ; silicate, 81 
Limestone, 82; disintegration of, 
81; -hills, 81; -pasture, 230; 
