Index to the Scientific Names, 



Synonyms and exotic species arc italicised. 



ANAB.^ENA. 



Azolhc, 182. 



AZOLLA. 



Caroliniana, 181. 

 filiculoides. 183. 

 EQUISETUM, 

 arvense, 43. 



f. campestre, 48. 



f. decumbens, 47. 



f. diffusum, 47. 



f. pseudosilvaticum, 47 

 Ferrissi, 28. 

 fluviatile, 58. 



f. litnosum, 62. 

 Funstoni, 34. 

 giganteum, 33. 

 hiemale, 19. 



f. intermedium, 25. 



robustum, 26. 

 laevigatum, 30. 

 littorale, 65. 

 Mexicanum, 33. 

 palustre, 62. 

 pratense, 53. 

 ramosisstmum^ 33. 

 scirpoides, 38. 

 silvaticum, 53. 

 telmateia, 50. 

 variegatum, 36. 



Alaskan um, 38. 



ISOETES. 



ambigua, 223. 

 Bolanderi, 227. 



pygmaea, 228. 

 Butleri, 252. 



immaculata, 252. 

 Canadensis, 237. 



Robbinsii, 238. 

 Dodgei, 237. 

 Enfant, 236. 

 echinospora, 221. 



Braunii, 220. 



Boottii, 221. 



Flettii, 222. 



maritima, 223. 



muricata, 222. 



robusta, 221. 



trnncata, 222. 

 Engelmanni, 233. 



Caroliniana, 235. 



fontana, 235. 



Georgiana, 235. 



gracilis, 235. 



valida, 236. 

 flaccida, 244. 



Chapman i, 245. 



rigida, 245. 

 foveolata, 241. 



plenospora, 242. 

 Gravesii, 242. 



