460 



INDEX 



naked buds, 188 



naked flowers, 271 



nasturtium, 54, 55, 251, 311 



nectar, 253, 263, 311 



nectary, 310 



nerves, of leaves, 205 



night-blooming cereus, 312 



nitrates, 344, 349, 392 



nitrogen, 95, 103, 344, 349, 376, 377, 



392 



nodes, 50 

 nodules, 377 

 non-seed plants, 362 

 non-vascular plants, 360 et seq. 

 Nostoc, 364 

 notebook, 31 

 nucellus, 276, 443 

 nucleus, 73, 74, 444 

 nutrient salts, 349 

 nutrition, 28, 40 

 nuts, 328, 329, 331, 338 







oak, 148, 167, 207, 305, 309 



oat rust, 378, 387 



oats, 4 



ocean currents, 355 



odor of flowers, 311 



(Edogonium, 368, 369, 400 



oil, 345, 346 



oily seeds, 347, 352 



onion, 48, 159 



oogonium, 368, 370 



oospore, 366, 367, 369, 385, 387, 400, 



402 



open bundles, 171 

 orange, 335 

 orchid, 48, 266 

 orchid family, 185, 266 

 organ, 44 

 organic, 55 

 osage orange, 49 

 Oscillatoria, 364, 365 

 osmosis, 106, 363 

 osmotic equilibrium, in 

 osmotic pressure, 106 

 ovary, 60, 183, 273, 431, 443 

 ovate leaves, 207 

 overproduction of buds, 189 



of pollen, 301 



of seedlings, 348 



of seeds, 355 

 ovipositor, 315 



ovule, 273. 274, 340, 432, 437 

 Oxalis, 348, 321 

 oxidation, 227 

 oxygen, 85, 95, 226 



palisade, 84, 85, 238 et seq. 



palm, 14, 172 



palmate leaves, 206, 207 



panicle, 300 



parasite, 373, 407 



parenchyma, 164 



parsnip, 125, 140 



parsnip, wild, 294, 300 



peach, 182, 213 



peanut, 65, 334 



pear, 293 



peas, 131, 153 



pedicel, 286, 298 



pedigreed stock, 446 



peduncle, 299 



peg of squash seedling, 353 



peony, 274 



pepper and salt, 161 



pepper grass, 140, 297 



perennials, 139, 158 



perfect flower, 281 



perianth, 271, 441 



pericarp, 327, 328, 338, 347 



perigyny, 291, 292 



permeable, 135 



persimmon, 335, 347 



petal, 59, 271 



petiole, 53 



Petunia, 312, 321 



Ptuzophycea, 371 



phloem, 80, 138, 165, 417, 419 



Phlox, 50, 209 



phosphorus, 103, 349 



photosynthesis, 43, 51, 54-56, 



et seq. 



phototropism, 132 

 phycomycetes, 390 

 physics, 117 

 pigeon wheat, 405, 406 

 pigment, 371 

 pigweed, 44, 337 



\, 228 



