INDEX 
Horse-chestnut buds, 102*, 103* 
Horticulture, 315-319 
Host, 49 
Hybrid blackberries, 190 
Hybrid plums, 187* 
Hybridizing, *186-190 
Hybrids, *186-190 
Hydrogen, 38, 343, 344 
Hydrophyllum, 125* 
Hydrophytes. See Water plants 
Hypha, 236 
Hypocotyl, 158*, 159* 
Hypogynous, 132 
Iceland moss, 251 
Independent plants, 48 
Indian corn, germination of, 18*, 
160* 
Indian corn, kernel of, 17*, 183* 
Indian corn, structure of stem of, 
11*, 68* 
Indian pipe, 50*, 51* 
Indian-corn breeding, *181-186 
Indian-corn culture, 182, 322 
Indusium, 272*, 273, 276* 
Industries, plant, *808-332. See also 
Agriculture, Horticulture, Fuel, 
Fibers, Timber 
Inferior ovary, 181*, 132* 
Insectivorous plants. See Carnivo- 
rous plants 
Insect-pollination, 139 
Insects, diseases due to, 328, 330 
Insects, pollen-carrying apparatus 
of, 146* 
Integuments, 300, 301*, 303* 
Intercellular spaces, 36* 
Iodine, from ale, 231 
Iodine test for starch, 40 
Trish moss, 233 
Irrigation, 322, 323 
Irritability, 22 
Irritability in plants, nature and 
occurrence of, 22 
Ivy, relations of, to light, 59* 
Jordan, E. O., 201 
Juniper, 294 
Jute, 318 
Kelps, 231 
Knees of cypress, 26* 
Knotgrass, pollination of, 142* 
Knots, 67*, 68 
Kolreuter, 138 
363 
Laminaria, 231 
Lateral buds, 95* 
Layering, 90 
Leaf, 34-36, *69-84 
Leaf, fall of, 77-79 
Leaf arrangement, *71-76 
Leaf buds, 95*, 101* 
Leaf mosaics, 74 
Leaf movements, 77* 
Leaf scars, 95*, 102*, 103*, 105* 
Leaf section, 36* 
Leaves, compound, 13 
Leaves, functions of, 38 
Leaves, simple, 13 
Leaves, structure of, 13, *34-36 
Leaves, submerged, 7* 
Leguminous plants, 205*, 207* 
Lenticels, 103, 105*, 106 
Leucoplasts, 41 
Lianas. See Climbing plants 
Lichens, *247-251 
Lichens, nature of, 249 
Lichens and soil formation, 250 
Lichens, uses of, 250, 251 
Light, exposure to, 58-60* 
Light, movements caused by, 76 
Lilac mildew, 244* 
Litmus, 251 
Live-forever, 126* 
Liverworts, 262, 268, 269*, 281 
Lizard’s-tail, 127* 
Locules, 129*, 131* 
Long-leaf pine, 294, 297* 
Lycoperdon, 259*, 261 
Lycopodinee, 281 
Lycopodium, 279* 
Macrocystis, 231 
Maidenhair fern, 270* 
Male cells of pollen tube, 135*, 291* 
Male nuclei of pollen tube, 135*, 291* 
Mallows, pollination in, 140* 
Maple sugar, 309, 311 
Marchantia, 269* 
Marl, 229 
Matrimony vine, pollination in, 140* 
May apple, 86* 
Mendel’s law, 187, 188 
Mesophytes, 82 
Mesquite, root system of, 29 
Microsphera, 261 
Microprle, 136*, 300, 301* 
Microspore, 290 
Microsporophyll, 290 
Migula, W., 199 
