334 



Index 



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. 

 Mm'um, 280. 

 Molds, 262. 

 Monocots, 1 1 8, 209; families of, 307; 



stem' structure, 125. 

 Morphology, 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, 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. 



P'ants, desert, 58, 157; importance of, i; 

 living things, 7, 8; mutual dependence 

 of oarts, 8, 9; of the past, 318; relation 

 tc environment, 8, 140; source of all 

 food, i 2.5. 



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. 



