558 



Index 



Potato family, 543. 



Potatoes, 344. 



Prairie formation, 326. 



Pressure, of growth, 200 ; osmotic, 87 ; root, 



ig5; turgor, 88. 

 Prickly pear, 169, 181. 

 Propagation, vegetative, 226. 

 Prosenchyma, 128. 

 Protein synthesis, 42. 

 Prothallus, 485. 

 Prolococcus, 447. 

 Protoplasm, 15, 16, 61. 

 Pteridophytes, 477. 

 Puff balls, 422. 

 Pulp wood, 345, 354, 364- 

 Pulvinus, 6g. 



Raceme, 242. 



Rainfall, seasonal distribution of, 210. 



RanunculacecB, 533- 



Rattan, 139. 



Receptacle, 237. 



Red algae, 463. 



Red pigment in plants, 54. 



Redfieldia, 113. 



Reduction division, 295, 296, 487. 



Redwood forest, 332. 



Reforestation, 366. 



Reproduction, 9; in algce, 446; in angio- 

 sperms, 243, 518; in conifers, 510; in 

 cycads, 504 ; in ferns, 484 ; in fungi, 405 ; 

 in liverworts, 469 ; in mosses, 473. 



Reservoirs, cleaning of, 456. 



Resin ducts, 142, 154. 



Resins, 57, 354- 



Respiration, 48; and shipping, 50; con- 

 trasted with photosynthesis, 49; injuries, 

 50; in roots, 197; in stems, 126; rate of, 

 50. 



Response, to aerial environment, 466 ; to 

 gravity, 215; to light, 203; to water, 

 173, 210. 



Rhizoids, 466. 



Rhizome, in. 



Rhodophycece, 463. 



Rice, 357. 



Rockweeds, 458. 



Root, absorption, 185, 191 ; contraction, 

 185; hairs, 184; pressure, 195; pro- 

 cesses, 1.77, 191, 197; systems, 181, 198; 

 tip, 293. 



Roots, 177; adventitious, 178; and bac- 

 teria, 188, 397; and fungi, 188; and 

 transplanting, 196; classification of, 177; 



growth of, 184; holdfast, 180, 187; of 

 climbers, 178; of conifers, 508; of epi- 

 phytes, 187; of ferns, 482; of hydro- 

 phytes, 186; of mesophytes, 181-186; 

 structures of, 183. 



Rootstocks, III. 



Rose family, 537. 



Rosette plants, 105. 



Rosin, 57, 354. 



Rubber, 58, 373- 



Rubber tree, 179. 



Russian thistle, 376. 



Russula, 420. 



Rust, 417; of apple, 419; black-stem, 418; 

 pine-blister, 419, 421. 



SalicacecB, 533. 



Sand-reed grass, in, 112. 



Sap, flow of, 162; pressure of, 195; wood, 

 157- 



Saprophyte, 381. 



Sarraceniacece, 534. 



Sassafras, 30 ; fossil leaf of, 546, 



Sclerenchyma, 130. 



Seed, coats, 521; dormancy due to, 265; 

 structure of, 251. 



Seedlings of corn, 177. 



Seeds, 257; abscission of, 260; of angio- 

 sperms, 259; dissemination of, 260; dor- 

 mancy of, 264; germination of, 270; of 

 gymnosperms, 259; longevity of, 268; 

 storage of, 269. 



Selaginella, 80, 489. 



Selection, 297; natural, 551. 



Self-pruning, 102. 



Sensitive plant, 69. 



Sequoia, 107, 2,53, 335- 



Sexual reproduction, 243. 



Shasta daisy, 283. 



Shrubs, 146. 



Sieve tubes, 134. 



Silviculture, 148. 



Sisal, 139, 369. 



Smuts, 414, 416, 433. 



Soil, acidity, 218, 220; bacteria, 393, 396; 

 erosion, 364; temperatures, 212; water- 

 delivering mechanism of, 193. 



Soils, alkali, 221 ; and crop production, 340. 



Solanacese, 543. 



Solution, 82. 



Sorghum, 351, 353. 



Spadix, 232, 527. 



Sperms, 243. 



Sphagnum, 475- 



