Index 



333 



Flowers, variety of, 200; economic im- 

 portance of, 214. 



Fog, 148. 



Fomes, 245. 



Food, 25 ; per acre, 33. 



Food accumulation, and agriculture, 78; 

 in roots, 77, 179; in leaves, 75; in 

 stems, 105, 159, 161. 



Food-conducting tissue, 20. 



Food conduction, 21, 178. 



Foods, produced per acre, 33 ; utilization 

 of, 82. 



Forests of North America, 299, 312. 



Fossils, 319. 



Fructose, 28. 



Fruit, 212; economic importance of, 214. 



Fuel, 2. 



Fungi, 260; and roots, 194. 



Gametes, 241. 



Geaster, 267. 



Gemmae, 273. 



Geographic distribution, 321. 



Geotropism, 131, 182. 



Ginseng, 195. 



Glucose, 27, 28. 



Grafting, 132. 



Grape, 225. 



Grass family, 308. 



Gravity, 140, 149, 182. 



Ground pine, 287. 



Growing point, 129, 180. 



Growing region, 88, 1 29, 180 ; of leaves, 87 ; 

 of roots, 180; of stems, 129. 



Growth, 82, 85; conditions for, 87; de- 

 termination of annual, 114; of roots, 

 179; of stems, 128; pressure, 182, 184; 

 stages of, 1 80. 



Guard cells, 18. 



Guayule, 163. 



Guinea grass, 42. 



Gymnosperms, 211, 294; number of, 303; 

 seeds of, 211 ; wood of, 294. 



Habitat, 56. 



Heartwood, 130. 



Heath family, 315. 



Hemp, 163. 



Herbs, 94 ; shrubs and trees, 98. 



Hippuris, 56. 



Horseradish, 167, 219. 



Horsetails, 286. 



Horticulture, 4, 100. 



Host, 250. 



Humus, 143, 257. 



Hyacinth, 97, 160. 



Hybridization, 226, 255. 



Hybrids, 220, 226. 



Hydnum, 267. 



Hydrophytes, 56, 57, 60, 156, 179, 273. 



Hydrotropism, 131, 183. 



Hypocotyl, 207. 



Imbibition, 172. 



Indian cucumber root, 38. 



Indian pipe, 249. 



Insect pollination, 104, 202. 



Internodes, '106. 



lodin, 246. 



Ipecac, 195. 



Iris, 41. 



Irish moss, 246. 



Irrigation, 141, 144, 145. 



Isolation, 328. 



Jack-in-the-pulpit, 160. 

 Jerusalem artichoke, 97, 161, 163. 

 Johnson grass, 159. 

 Jute, 163. 



Kelps, 246. 

 Kohl-rabi, 163. 



Landscape architecture, 100. 



Lantana leaf, 14. 



Laurel, 316. 



Leaf, arrangement, 37 ; coloration, 63 ; 

 fall, 67 ; parts of, 13 ; pigments, 63, 65 ; 

 position and light, 37, 46; scars, 113; 

 structure, 13, 42, 54, 56; tissues, 14. 



Leaves, 13 ; commercial products from, 91 ; 

 effects of light on, 42 ; floating, 57 ; hori- 

 zontal, 43 ; motile, 43 ; of conifers, 296 ; 

 of shade plants, 44 ; relation to light, 37, 

 46 ; submerged, 45, 56 ; vertical, 42 ; 

 water relations of, 48 ; white, 66. 



Legume family, 313. 



Legumes and bacteria, 194, 258. 



Lenticels, 106, 115. 



Lichens, 59, 269. 



Lifting of water, 134. 



Light, 148. 



Lignification, 123. 



Lignin, 122. 



Lily family, 310. 



Lipase, 75. 



Liverworts, 272. 



Longevity of plants, 94. 



Lumbering, 161. 



Lycopodium, 287. 



Magnolia, 37. 

 Mango, 211. 



