262 



INDEX. 



Protandry, 128, 135. 



Protection of leaves. 9, 10, 11, 12 



41, 4„', 4-5', JfS, 49. 

 Proteids, 153, 156, 189. 

 Protogyny, 128, 135. 

 Protoplasm, 154, 156. 

 Ptelea, 115. 

 Puffl-balls, 157. 



Quillwort, 94, ;k5, SOS. 



R 



Rain, 51, 247. 



Ranunculus, IS'i. 



Raspberry, 91. 



Receptacle, 7!>, 81, II4. 



Redbud, 10. 



Reed grass, 143, 185, 186. 



Reed swamps, 185. 



Reproduction. 8, 109. 



Respiration, 33, 154, 156. 



Rhizoids, 107. 



Rivalry. 146. 



Robinia, 1J.5, 136, 133, S07. 



Rock-rose, S33. 



Rock hocictie.'i, 209, JIO. 



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



171. 

 Ro(,t-cap, lOS. 

 Root-hairs, 90. 

 Rootstalk, 5S, 56, 75, 76, 77, TS, 



1:15. 

 Rose acacia, IC^S, 126, 133. 

 Rosclte habit, 16, 17, IS, 19, 47, 9J, 



15S, 160, 209, 234. 

 Rosinweed, 10, 197, 19S. 

 Rubber tree, I114. 

 Runners, 57, 9:!. 

 Rusts, 157. 



Sage brush, 216. 



Sagittaria, 186. 



Saintpaulia, 10. 



Salt deserts, 255. 



Salt steppes, J54- 



Sand societies, 209. 



Sandy fields, 309, S12. 



Sanguinaria, 195. 



Saprophytes, 150, 189. 



Sap-wood, 151. 



Sargassum, 17J. 



Sarracenia, 155, 156, 158. 



Saxifrage, 5S. 



Scale leaves, 70, 75. 



Scales, 141. 



Scouring rush, SOS. 



Screw pine, 103. 



Scrub, 220. 



Seaweeds, 1, 2, 87, 99. 



Sedges. 187. 



Seed-dispersal, 112, 113, II4, 116, 



117, US, 119, 120. 

 Seed-plants. Ill, 119, 121. 

 Seeds, 111, US, 113, 115, 138, 139, 



140. 

 Selaginella, 26, 100, 194. 

 Sempervivum, 19. 

 Senecio, II4. 



Sensitive plants, 11, 48, 50, 199. 

 Sejials, 7.V, 79. SO. 

 Shepherdia, 4-i- 

 Shoots, 53. 



Silphium, 10, 197, 19S. 

 Smilax, 61. 

 Snapdragon, SO, 137. 

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



224. 

 Solomon's seal, 35, 76. 

 Spanish needle. 119, 121. 

 Sphagnuiu, 1S8. 



