INDEX 
Reproduction, 3; asexual, 107; 
blue-green Algee, 101; red Alge, 
126; sexual, 107; vegetative 
multiplication, 101. 
Reservations, forest, 322. 
Resin, 219. 
Respiration, 87. 
Rhizoid, 167. 
Rhizome, 63; self-burial, 67. 
Rhodophycez, 124. 
Rib, 7. 
Riccia, 172. 
Ricciocarpus, 172. 
Rice, 269. 
Rockweed, 118. 
Root, 71; absorption, 78; air, 82; 
bast, 74; branch, 76; cambium, 
75; clinging, 81; cuttings, 70; 
growth, 76; diameter increase, 
75; hair, 74; internal structure, 
74; phloem, 74; primary, 72; 
prop, 80; secondary, 72; special 
forms, 80; tap, 72; vascular 
cylinder, 74; water, 80; wood, 
74; xylem, 74. 
Root-cap, 73. 
Root-cuttings, 70. 
Root-fungus, 159. 
Root-hair, 74, 78. 
Root-pressure, 58. 
Rootstock, 63; self-burial, 67. 
Root-tubercles, 136. 
Rosacee, 286. 
Roses, 286. 
Rosette-habit, 11, 28. 
Rubiacez, 307. 
Runner, 47. 
Rust, 149. 
Rye, 266. 
Sac Fungi, 146. 
Sago-palm, 276. 
363 
Salt marsh, 336. 
Salt meadow, 336. 
Salt steppe, 344. 
Sand, 77. 
Sand-binder, 339. 
Sap, ascent, 57; maple, 58. 
Saprophyte, 129. 
Sargassum, 119. 
Sarracenia, 35. 
Scale, 26, 34. 
Scion, 56. 
Scouring rush, 198. 
Sea lettuce, 116. 
Seed, absorption of water, 86; 
Angiosperm, 237; conifer, 217; 
dispersal, 255; germination, $+, 
218; structure, 84. 
Seed-dispersal, 255; air, 257; 
animals, 260; discharge, 255; 
water, 259. 
Selaginella, 203. 
Selection, 318. 
Self-burial, 67. 
Self-pollination, 243. 
Sensitive plant, 30. 
Sepal, 221. 
Sequoia, 211, 219. 
Shaddock, 299. 
Shade-plant, 326. 
Shoot, 41. 
Sieve plate, 53. 
Sieve vessel, 53. 
Siphon forms, 116. 
Societies, 324. 
Soil, 77. 
Solanacee, 304. 
Sorus, 191. 
Species, 263. 
Sperm, Angiosperm, 235; conifer, 
216; cycad, 211; fern, 194; 
liverwort, 169; moss, 177; Gido- 
gonium, 110; red Alge, 126. 
