264 



INDEX. 



Protandry, 128, 135. 



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



41, 42, 43, 48, 49. 

 Proteids, 153, 156, 189. 

 Protogyny, 128, 135. 

 Protoplasm, 154, 156. 

 Ptelea, 115. 

 Puff-balls, 157. 



Q 



Quillwort, 94, 95, 208. 



It 



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 associations, 209, 210. 



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



171. 

 Root-cap, 108. 

 Root-hairs, 90. 

 Rootstalk, 55, 56, 75, 76, 77, 78, 



195. 

 Rose acacia, 125, 126, 133. 

 Rosette habit, 16, 17, 18, 19, 47, 94, 



158, 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 associations, 209. 



Sandy fields, 209, 2 12. 



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, 118, 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, 80. 

 Shepherdia, 44- 

 Shoots, 53. 



Silphium, 10, 197, 198. 

 Smilax, 61. 

 Snapdragon, 80, 137. 

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



224. 

 Solomon's seal, 35, 76. 

 Spanish needle, 119, 121. 

 Sphagnum, 188. 



