•-h 



INDEX. 



Ophrys, 183. 

 Orobas, 118. 

 Osmnronia, 189, 29;). 

 Oxytropis, 118. 

 Oxyura, 245. 



Ptirnassia, 102. 

 Paroliuia, 44. 

 Passifiora, 118, 

 Pelur^ouium, 49. 

 Peltaria, 44. 



Pent-itemon, 118, 218, 237. 

 Petalostemoii, 118. 

 Petasites, 18. 

 Phaca, 24. . 

 Plialaugium, 118. 

 Phlox, 252. 



Physocarpa, 28. 

 Physoearpon, 25. 



Plagiobothrys, 231, 282. 

 PIr.ntago, 262. 

 PlatystemoD, 13. 

 Podalyria^ 118. 

 Poinsettia, 90. 

 Polanisia, 50, 274. 

 Poleinouinm, 75, 252. 

 Porrum, 52. 

 Porterella, 125. 

 Potentilla, 95, 118. 

 Potlios, 184. 



Preuanthes, 21, 130. 

 Pruiius, 67. 

 Psacalium, 228. 

 Psilostropbe, 175. 

 Psoralea, 118. 

 Ptilonella, 247. 

 Ptiloria, 130. 

 Purshia, 298. 



Pycnanthemiim, 118. 

 Pyrrliopappus, 179. 



Ralinesqxiia, 192. 

 Ramona, 235, 301. [296. 

 Raunnculus, 58, 109, 225, 

 Rhomniis, 14. 

 Rhododendron, 172. 

 Ribes, 118. 

 Riddellia, 175. 

 Rudbeckia, 118. 



Quercus, 17, 111. 



Saccharum, 118. 

 Sagittaria, 158. 

 Salix, 39. 

 Salvia, 235. 

 Sambucus, 297. 



Saxifraga, 101, 163. 

 Scliizonotiis, 67. 

 Scorzonella, 19. 

 Selinum, 102. 

 Seuecio, 19, 166. 

 Seseli, 118. 



Shepherdia, 121. 

 Sicyos, 118. 



Sideranthixs, 115, 118. 

 Silene, 229. 



Sisyrinchinm, 69, 106. 

 Sitilias, 179. 



Siuni, 3, 5, 9, 102. 

 Solanoa, 67. 



Solidago, 38. 

 Sorbaria, 66. 



Sorbus, 198. 

 Spathyema, 184. 

 Sph:-eralcea, 276. 

 Sphjeroma, 276. 

 Spiesia, 286. 



Stanleya, 50. 

 Steenhammera, 186. 



Stephanomeria, 130. 

 Streptanthus, 46, 225. 

 Stylopappxis, 176. 

 Stylosanthes, 118. 

 Subularia, 45. 

 Symplocarpus, 184. 



Synandra, 193. 

 Syrmatium, 147. 



Tausclieria, 44. 

 Tellima, 162. 



Tetrapoma, 44. 

 Thalictram, 24. 

 Thixraria, 115. 

 Thyrsanthiis, 175. 

 Thysanocarpna, 44. 



Tigarea, 298. 

 Tissa, 229. 

 Tithymalus, 90. 

 Tormentilla, 262. 

 Torreya, 193. 

 Toxylon, 122. 

 Trichostenia, 234. 

 Tridax, 246. 

 Trifolium, 223. 

 Trigonella, 137. 

 Tri^onia, 189. 

 Triteleia, 261. 

 Trop^oliini, 48. 

 Tropidocarpum. 24. 

 Troximon, 76, 118. 

 Tumion, 193. 



Ulmaria, 65. 

 Unifolium, 31. 

 Uniola, 119. 



Vancouveria, 100. 

 Vella, 45. 

 Yiola, 14. 

 Virgilia, 119. 

 Yitis, 119. 

 Wigandia, 23. 

 Wistaria, 175. 

 Wittia, 121. 



XaBtliocephalum, 281 

 Xylotheriuia, 188. 



Yucea, 115, 119. 



