INDEX. 



Rhizome, 354 



Rhizomorph (rhi'zo-morph), 89 



Rhizophidium, 214, 215 



Rhizopus, 177-180, 215 



Rhododendron, 499 



Rhodomeniales, 175 



Rhodophyceae, 171 



Rhus radicans, 416, 497 



Riccia, 23, 164, 222-226 



Ricinus, 497 



Riverweed, 496 



Root, function of, 410-418 



Root-hairs, absorption by, 19, 30, 



32 



Root-hairs, action on soil, 82 

 Root pressure, 33, 34, 45 

 Root, structure of, 30, 361 362 

 Root tubercles, 92 

 Roots, kinds of, 415 

 Rosaceae, 497 

 Resales, 496 

 Rose family, 497 

 Rosette, 405 

 Rosette plants, 483 

 Rubiales, 501 

 Rudbeckia, 502 

 Rusts, 187-194 



Salicaceae, 494 

 Salix, 494 

 Salsify, 502 

 Salviniaceae, 296 

 Samara, 451 

 Sandalwood, 495 

 Sanguinaria, 496 

 Santalales, 495 

 Sap, rise of, 53, 54 

 Sapindales, 497 

 Saprolegnia, 181-184 

 Saprolegniales, 215 

 Saprophytes, 83-85 

 Sargassum, 170 

 Sarraceniales, 496 

 Sarsaparilla, 499 

 Saxifrage, 496 

 Schizaeaceae, 295 

 Schizocarp, 451 

 Schizomycetes, 164 

 Schizophyceae, 163 

 Sclerenchyma, 356-357, 361, 363 

 Scouring-rush, 282 

 Screw-pine, 409, 492 

 Scrophulariaceae, 501 

 Sedge family, 492 



Seed, dispersal of, 458-463 

 Seed plants, 338 

 Seed, s'ructure of, 98, 102 

 Seedlings, 97-107 

 Seeds, 330-334 

 Selaginella, 286-288, 292 

 Selaginellaceae, 296 

 Sensitive fern, 273 

 Sensitive plants, 132, 396, 399 

 Sexual organs, 144, 147 

 Shadbush, 497 

 Shepherd's-purse, 496 

 Shoot, floral, 419, 432 

 Shoots, 353-355; types of, 365- 

 373; winter condition of, 374- 



377 



Sieve tissue, 358, 363 

 Sieve tubes, 52, 53 

 Silique, 453 

 Silk -cotton tree, 417 

 Silver bell, 500 

 Siphoneas, 146, 162 

 Skunk's cabbage, 439-442 

 Slime molds, 83 

 Smoke- ree, 497 

 Societies, 475 

 Solanum, 501 

 Solidago, 502 

 Sourwood, 499 

 Spadix, 428 

 Spartium, 446 

 Spathyema fcetida, 438, 493 

 Spermagonia, 190 

 Spermatophytes, 338 

 Sphacelaria, 168 

 Sphaerella lacustris, 158, 159 

 Sphaerella nivalis, 158, 350 

 Sphaeriales, 218 

 Sphagnales, 248 

 Sphagnum, 164 

 Spiderwort, u, 493 

 Spike, 428 



Spirodela polyrhiza, 27 

 Spirogyra, 1-5, 13, 14, 60, 72, 136- 



140, 35 



Sporangia, 178-182 

 Sporangium, 253-258, 281, 290 

 Spores, 225, 256-258, 263, 264, 



281 



Sporocarp, 173 

 Sporogonium (spo"ro-go'ni-um), 



224, 231, 233, 234, 237, 238, 239, 



241, 246, 247, 248 

 Sporophyll, 274, 281, 292 



