3*8 



Index 



Recessive (Mendelian), 327, 



328 



Red Algae (see also " Rhodo- 

 phycese"), 58, 63, 64, 68, 

 69, 80, 335; pigments of, 

 63; reproduction of, 335 

 Red-bud (Cercis), 270 

 Redwood (Sequoia), 256, 274 

 Regeneration in plants, 15, 16, 



304 

 Reproduction, 20, 62, 64, 65, 



222, 223, 224, 302, 332; 



Brown Algae, 62; Red Al- 

 gae, 64; nature of reproduc- 

 tion in the higher plants, 

 332 



Resurrection-plant (See " Se- 

 laginella ") 



Rhiphidium, *73 



Rhizoid, 101 



Rhodophyceae (see also "Red 

 Algae"), 58 



Rhododendron, 47, 213, 217, 

 246, 262, 270, 337; hybrid, 

 337 



Riccia, *87, 91, 92, *Q3 



Ricciocarpus, *85, 86 



Rock-weed (Fucus), 58, 189 



Rocky Mountains, influence 

 on climate, 259 



Roots, 86, 89, loo, 101 



Root stock, 215 



Rose-mildew, 72, 75 



Rubus (see also " Bramble "), 

 315, 339; R- cratfcgifolius, 

 339 ; R. ur sinus, 339 



Rue-anemone, *I74 



Sac-fungi, 75 

 Sagittaria, 40, 167 

 Sage-brush, 221, 271 

 Sago-palm (see "Cycas") 

 Salinity, effects of, 189 

 Salt-marsh plants, 202 

 Salviniaceae, 131 

 Sand-verbena (Abronia), 203 

 Saprolegnia, *74 

 Saprophytes, 72, 211, 215, 217 



Sarcodes, 217 



Sargassum, *35, 60 



Sarracenia, 219 



Sassafras, 242, 249, 251, 255, 



269 



Scarlet balm (Monarda), 179 

 Scarlet sage, 179, 234 

 Schizophyta, 50 

 Scouring rush (see " Equi- 



setum ") 

 Screw-pine (Pandanus), 153, 



154, 164, 165, 247, 265 

 Scrophulariacea?, 337 

 Sea-lettuce (Ulva), 34, 57 

 Sea-palm (Postelsia), 60, 



*i9i, 192 



Sea-rocket (see " Cakile ") 

 Sea-weeds, 58, 69, 187, 188, 



204, 334 

 Secondary thickening, 105, 



106 



Sedges, 174, 338; hybrid, 338 

 Seeds, 108, 109, no, in, 122, 



128; origin of, 108, 109 

 Seed-ferns (see also " Pteri- 



dosperms"), no, 115 

 Seed-plants (Spermato- 



phytes), no, 120, 123, 128, 



130, 145, 146; fossil, 145 

 Selaginella, 104, 105, 109, 123, 



124, 125, 126, 129; S. lepido- 



phylla, 42 

 Selection, factor in evolution, 



46, 307 



Sempervivum, 345 

 Senecip, 247 

 Sensitive fern (Onoclea), 



258 



Sequoia, 142, 242, 249, 255 

 Sex, Sexuality, 75, 86, 154, 



190, 214, 329, 330, 332, 333 ; 



significance of, 333 

 Shephed's purse (see " Cap- 



sella ") 

 Sigillaria, 139 

 Silurian, flora of, 58 

 Sinmngia speciosa, 337 

 Siphoneae, 58, 69, 204 



