INDEX. 



735 



Rhizopus, 177-180, 215 



Rhododendron, 531 



Rhodomeniales, 175 



Rhodophyceae, 171 



Rhus radicans, 416, 707 



Rhus trilobata, 569 



Riccia, 23, 164, 222-226, 627 



Ricinus, 707 



Riverweed, 627, 706 



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, 679, 706 



Resales, 678, 706 



Rose family, 679, 706 



Rosette, 405 



Rosette plants, 580, 581, 584, 585 



Rubiales, 711 



Rudbeckia, 712 



Ruppia maritima, 618 



Ruppia occidentalis, 563, 702 



Russian thistle, 705 



Rusts, 187-194 



Sage-brush, 559, 560, 570 

 Sahara desert, 574 

 Salicaceae, 667, 704 

 Salicornia, 618 

 Salicornia herbacea, 563, 705 

 Salix, 667, 704 

 Salix adenophylla, 594 

 Salix glaucophylla, 594 

 Salix polaris, 583 

 Salsify, 711 

 Salsola kali, 705 

 Salsola tragus, 705 

 Salt-basins, 563 

 Salt-bushes, 572 

 Salt-marsh, 617 

 Salt-ponds, 623 

 Saltwort, 590, 591, 705 

 Salvinia, 627 

 Salviniaceae, 296 

 Samara, 451 

 Sandalwood, 705 

 Sand-cherry, 590, 592 

 Sand-dunes, 569, 704 

 Sand-hills, 561 

 Sanguinaria, 706 

 Santalales, 704 



Sap, rise of, 53, 54 



Sapindales, 685, 707 



Saprolegnia, 181-184 



Saprolegniales, 215 



Saprophytes, 83-85 



Sarcobatus, 564, 572 



Sargassum, 170 



Sarracenia purpurea, 610 



Sarraceniales, 706 



Sarsaparilla, 708 



Saxifraga oppositifolia, 583 



Saxifrage, 706 



Scavengers, 554~555 



Schizaeaceae, 295 



Schizocarp, 451 



Schizomycetes, 164 



Schizophyceae, 163 



Sclerenchyma, 35 6-35 7, 361, 363 



Scouring-rush, 282 



Screw-pine, 409, 702 



Scrophulariaceae, 696, 710 



Sea-beach panicum, 599 



Sea-blite, 590 



Seacoast marsh-elder, 599 



Sea-grass, 628 



Sea-oats, 599 



Sea-purslane, 590 



Sea-rocket, 590, 591 



Seaside-spurge, 590 



Sedge family, 659, 702 



Sedges, 607, 625 



Seed, dispersal of, 458-463 



Seed plants, 338 



Seed, structure of, 98, 102 



Seedlings, 97-107 



Seeds, 330-334, 57 



Selaginclla, 286-288, 292 



Selaginellaceae, 296 



Semiaquatics, 625, 626 



Sensitive fern, 273 



Sensitive plants, 132, 396, 399 



Sequoia sempervirens, 538, 539 



Sequoia washingtonia=S. gigantea ; 



534, 539-541 m 

 Sesuvium maritimum, 590 

 Sexual organs, 144, 147 

 Shadbush, 707 

 Shepherd's purse, 676, 706 

 Shoot, floral, 419, 432 

 Shoots, 353-3555 types of, 365-373; 



winter condition of, 374-377 

 Sieve tissue, 358, 363 

 Sieve tubes, 52, 53 

 Silique, 453 



