334 



Index 



oS ; swamp, 209. 

 flow of sap, 135 



families of, 307 



Mangrove, seedlings, 

 Maple, 30, 38, 201 ; 



sugar, 30, 163. 

 Marchantia, 272, 275 

 May apple, 98, 159. 

 Mechanical tissue, 21 

 Membranes, 173. 

 Mertensia, 54. 

 Mesophyll, 15, 19. 

 Mcsophytes, 60. 

 Microspora, 236, 238. 

 Midrib, 13. 

 Milkweed, 198. 

 Mimosa, 44, 314. 

 Mint family, 314. 

 Mistletoe, 249. 

 Mnium, 280. 

 Molds, 262. 

 Monocots, 1 1 8, 209 



stem structure, 125. 

 Morphology, 151. 



Mosses, 23, 59, 277 ; life histor>' of, 279. 

 Moth mullein, 95. 

 Motile leaves, 43. 



Multiplication, vegetative, 217, 243, 279. 

 Mushrooms, 249, 267, 268. 

 Mustard family, 312. 

 Mutants, 225. 

 Mutation, 224, 327; bud, 226. 



Naiad, 57. 



Nasturtium leaf, 14. 



Natural selection, 327. 



Nectar, 202. 



Nectaries, 202. 



Net-veined leaves, 88, 118. 



Nightshade, 315. 



Nitrifying bacteria, 258. 



Nitrogen, 32, 141 ; fixation, 258. 



Nodes, 106. 



Nucleus, 15. 



Nutritive phase of plants, 197. 



Oak, 161, 198. 

 Oats, 147. 



Oedogonium, 236, 241. 

 Oils, 31, 215. 

 Onion, 79, 160, 198. 

 Oospore, 242. 

 Open bundle, 127. 

 Orange leaf, 14. 

 Orchid family, 311. 

 Orchids, 190, 204, 311. 

 Organs, 21. 

 Osier willow, 163. 

 Osmosis, 173; in roots, 175. 

 Ovulary, 200. 



Ovule, 200. 

 Oxalis leaf, 15, 44. 

 Oxidation, 82. 



Palisade cell, 17; layers, 19. 



Palm, coconut, 214, 306; date, no; 

 family, 307 ; hat, 91. 



Parallel-veined leaves, 88, 118; growing 

 region of. 87. 



Parasites, 249. 



Parenchyma, 120. 



Parmelia, 269. 



Parsnip, 79, 96. 



Pasteurization, 256. 



Pea leaf, 16. 



Peach leaf, 14. 



Peanut, 78, 79. 



Pedicel, 200. 



Peduncle, 199. 



Peppermint, 314. 



Pepsin,_ 75. 



Perennials, 96. 



PermeabiHty, 173. 



Persimmon, 213. 



Petal, 200. 



Petiole, 14. 



Phloem = food conducting and bast tis- 

 sues, 119. 



Photosynthesis, 26; summary of, 31. 



Phototropism, 131, 183. 



Physiology, 151. 



Pigments, green, 63 ; red, 65 ; yellow, 63. 



Pine, 202; Japanese dwarf, 99; trees, in. 



Pineapple, 210. 



Pistil, 200. 



Pith, 120, 125; rays, 120. 



Plant, breeding, 220; characteristics, 99; 

 fibers, I, 91, 215, 228; kingdom, de- 

 velopment of, 300; producing arts, 99. 



Plants, desert, 58, 157; importance of, i; 

 living things, 7, 8; mutual dependence 



. of parts, 8, 9; of the past, 318; relation 

 to environment, 8, 140; source of all 

 food, I, 25. 



Plastids, 22. 



Plumule, 208. 



Pod, 212. 



Pollen, 200, 205 ; tube, 204. 



Pollination, 201 ; cross, 203 ; in conifers, 



202 ; self, 203. 

 Pond scums, 237, 245 ; living conditions of, 



239- 

 Pond weed. 57. 

 Poplar leaf, 14. 

 Potassium, source of, 247. 

 Potato, 10, 76, 79, 87; sweet, 97, 194; 

 tuber cell, 17; family, 315. 



