L>«'4 



IXDEX. 



Prop roots, 99, 103, 104, 105, 106, 



255. 

 Protandry, 128, 135. 

 Protection of leaves, 9, 10, 11, 12, 



41. J#, 43, 48, 49. 

 Proteids, 153, 156, 189. 

 Protogyny, 128, 135. 

 Protoplasm, 154, 156. 

 Ptelea, 115. 

 Pull-balls, 157. 



Q 



Quillwort, 94, 95, 208. 



R 



Rain, 51, 256. 



Ranunculus, 185. 



Raspberry, 91. 



Receptacle, 79, 81, 114. 



Redbud, 10. 



Reed grass, 142, 185, 186. 



Reed swamps, 185. 



Reproduction, 3, 109. 



Respiration, 32, 154, 156. 



Rhizoids, 107. 



Rivalry, 146. 



Robinia, 125, 126, 133, 207. 



Rock-rose, 236. 



Rock societies, 209, 210. 



Roots, 89, 90, 95, 98, 99, 138, 139, 



171. 

 Root-cap, 108. 

 Root-hairs. 90. 

 Rootstalk, 55, 5G, 75, 76, 77, 78, 



195. 

 Rose acacia, 125, 126, 133. 

 R«»scttc habit, 16, 17, IS, 19, 47, 94, 



15S, 160, 209, 237. 

 Rosinweed, 10, 197, 198. 

 Rubber tree, 104. 

 Runners, 57, 93. 

 Rusts, 157. 



Sage brush, 216. 



Sagittaria, 186. 



Saintpaulia, 16. 



Salt deserts, 231. 



Salt steppes, 231. 



Sand societies, 209. 



Sandy fields, 209, 212. 



Sanguinaria, 195. 



Saprophytes, 150, 189. 



Sap-wood, 151. 



Sargassum, 172. 



Sarracenia, 155, 156, 158. 



Saxifrage, 58. 



Scale leaves, 70, 75. 



Scales, 141. 



Scouring rush, 203. 



Screw pine, 103. 



Scrub, 227. 



Seaweeds, 1, 2, 87, 99. 



Sedges, 187. 



Seed-dispersal, 112, 113, 114, 116, 



117, US, 119, 120. 

 Seed-plants, 111, 119, 121. 

 Seeds, 111, 112, 113, 115, 138, 139, 



140. 

 Selaginella, 26, 100, 194. 

 Sempervivum, 19. 

 Senecio, 114. 



Sensitive plants, 11, 48, 50, 199. 

 Sepals, 78, 79. so. 

 Shepherdia, 44- 

 Shoots, 53. 



Silphium, 10, 197, 198. 

 Smilax, 61. 

 Snapdragon, SO, 137. 

 Soil. 90, 94, 145, 151, 166, 214, 



224. 

 Solomon's seal, 35, 76. 

 Spanish needle, 119, 121. 

 Sphagnum, 188. 



