INDEX 



503 



Ragweed family, 485, 489 

 Ranales, 438, 440 

 Ranunculus, 438, 439 

 Ray, flower, 489, 490 



medullary, 92, 93, 94 

 Rattlebox, yellow, 479 

 Recessive factor, 143 

 Receptacle, 381-386, 439 

 Red algae, 210, 218 



bud, 451 



snow, 176 

 Regeneration of stems, 364 

 Respiration, 8, 21, 54, 88 

 Reproduction, no, 136 

 Resin, 39, 364 

 Resurrection plant, 346 

 Rhamnales, 461 

 Rhinanthus, 479 

 Rhizoids, 269, 273 

 Rhizomes, no, in, 323, 324 

 Rhizopus, 224, 225, 226 

 Rhododendron, leaf, 41 

 Rhodophyceae, 210, 211 

 Rhus, 460 

 Ribes, 449 

 Riccia, 272 

 Ricciocarpus, 272, 273, 274, 276, 278, 



281 

 Richards, 75 



Ring, annual, 73, 75, 91, 92 

 Rivularia, 166 

 Rock, decomposition of, 49 



disintegration of, 49 

 Rockweed, 206 

 Root, I, 4, 46, 298, 314 



aerial, 64 



anchoring and supporting, 69 



bacteria on, 65 



bending of, 62, 63 



binding action, 70 



cap, 58, 60, 398 



contraction of, 70 



growth of, 47, 56-58, 63 



hairs, 46, 47, 52 



lateral, 59, 62, 63 



modification of, 64, 1 09 



sensitiveness of, 61, 109 



storage organs of, 69 



Root, structure of, 56, 59, 60, 61 



surface of, 55 



toxic substances from, 53 

 Rootstock, no, in 

 Rosales, 447 

 Rosette, 29 

 Rose, 38s 



family, 450 



order, 447 

 Rostellum, 423, 425 

 Rubiales, 481 

 Rush, 401, 416, 418 

 Rusts, 251 



white, 220, 223 



Saccharomycetes, 248, 249 

 Sac fungi, 228 

 Sage, 477 

 Salicales, 429 

 Salix, 381, 430 

 Salvia, 477 

 Saltpeter, 66, 160 

 Samara, 398, 458, 459 

 Sambucus, 481, 482 

 Sanguinaria, 442, 443 

 Sap, 3, 33, 69, 71, 83 

 Sapindales, 456 

 Saprolegnia, 219, 222, 223 

 Saprolegniales, 218 

 Saprophytes, 153, 217 

 Sapwood, 95 

 Sargassum, 206 

 Saxifrage, 387, 449 

 Scabiosa, 481, 482 

 Scenedesmus, 182 

 Schizocarp, 458, 459 

 Schizophyta, 154 

 Scitaminales, 420 

 Sclerenchyma, 78 

 Sclerotium, 237, 238 

 Scouring rush, 336 

 Scrophulariaceae, 478 

 Scutellaria, 477 

 Scutellum, 135, 409 

 Secondary growth, 85 

 Sedge family, 410 



order, 405 

 Sedum, 116, 379, 448 



