486 



INDEX 



(.Nwmbers refer to pages.) 



Pine and poplar, 384. 



Pineapple, fruit, 304; seedless, 376. 



Pine, healing of wounds, 72; leaves, 

 106, 107, 118; pollination of, 236. 



Pines, associates of, 413; discussion 

 of, 306; phyllotaxy, 68. 



Pink, flower, 152 ; tribe, 143 ; placenta, 

 143. 



Pinks, renewing, 388. 



PinnjB, 91, 344. 



Pinnate, 88. 



Pinnule, 91, 344. 



Pipe-vine, 210. 



Pistil, 133; compound, 144. 



Pistillate, 139. 



Pit, 257. 



Pitcher plant, 99. 



Pitch-forks, 180, 338. 



Placenta, 143. 



Plaited, 59. 



Plane tree, 40, 161. 



Planting school grounds, 448. 



Plants, growing of, 448. 



Plantain, fruit, 262; phyllotaxy, 68; 

 rattlesnake, 223; spike, 189. 



Plant-food, 424. 



Plicate, 59. 



Plum, fertilization, 313; flower, 144, 

 152, 214; fruit, 256, 257; habit, 396; 

 on peach, 379; ovary, 142, phenol- 

 ogy, 407; phyllotaxy, 67; spur, 31. 



Plumule, 321. 



Plur-annual, 386. 



Plurifoliolate, 95. 



Pod, compound, 263. 



Pods, 259. 



Pogonia, 224. 



Poinsettia, 156. 



Poison ivy, 88, 414; climbing, 401; 

 plants, 350, 414. 



Poison sumac, 88, 414. 



Pollen, 134; influence on fruit, 311. 



Pollinating, 246. 



Pollination, 136, 234. 



Pollinium, 243. 



Polyanthus, 239. 



Polygala, 244. 



Polygamous, 170. 



Polygonum, 401. 



Polymorphism, 240. 



Polypetalous, 183. 



Polypetaly, 215. 



Polysepalous, 184. 



Pome, 293. 



Pondweeds, 376. 



Pontederia, 240. 



Poplar, leaf, 79. 



Poplars, sex of, 163. 



Poplar succeeds pine, 384. 



Poppy, California, 403; fruit, 263. 



Portulaca, movement in, 403: see 

 Purslane and Pursley. 



Potassium, 422. 



Potato-blight, 352. 



Potato, cuttings of, 377; duration of. 

 386; flower, 152; fruit, 275; phyllo- 

 taxy, 69; sweet, 363; tuber, 362. 



Potatoes, hill of, 366. 



Prepotent pollen, 235. 



Preserving of plants, 437. 



Pressing plants, 441. 



Prickles for climbing, 401. 



Prim, phenology, 417. 



Primrose, fertilization, 239- placenta, 

 143. 



Privet, phenology, 417. 



Privets, shoots of, 11. 



Procumbent, 390. 



Progressive inflorescence, l^l. 



Propagating-box, 380. 



Propagation of plants, 316 et seq 



Prostrate, 390. 



Proterandrous, 169. 



Proterogynous, 169. 



