334 



Mangrove, seedlings, 208; swamp, 209. 

 Maple, 30, 38, 201 ; flow of sap, 135 



sugar, 30, 163. 

 Marchantia, 272, 275. 

 May apple, 98, 159. 

 Mechanical tissue, 21. 

 Membranes, 173. 

 Mertensia, 54. 

 Mesophyll, 15, 19. 

 Mesophytes, 60. 

 Microspora, 236, 238. 

 Midrib, 13. 

 Milkweed, 198. 

 Mimosa, 44, 314. 

 Mint family, 314. 

 Mistletoe, 249. 

 Mnium, 280. 

 Molds, 262. 

 Monocots, 118, 209 ; families of, 307 ; 



stem structure, 125. 

 Morpihology, 151. 



Mosses, 23, 59, 277; life history 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. 



Permeability, 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, 11 1. 



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- 



Pondweed, 57. 



Poplar leaf, 14. 



Potassium, source of, 247. 



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

 tuber cell, 17; family, 315. 



