Oil page 57. 



Elodea camiinniilata Pursli. is ITyperioum virLciiiieiim of Gray's List. 



On page G2. 



OsLuorrliiza brevipes (C. & R.) Suksilorf. 



On page 69. 



Omit Allocaryia californica (DC) Greene; not credited to Washington or British 

 Columbia by Trofessor C. V. Piper. 



On page 71. 



Omit Mentha viridis L., a synonym of M. spioata L. 



On page 77. 



Omit Valeriana septentrionalis Rydb. 



On page SO. 



After Artemisia hidoviciana Nntt. insert A. oecidentalis Nntt. Victoria, V.I. 



On page 84. 



After Madia sativa Mol. insert M. sativa capitata (Nutt.) Piper. Piper & 

 Beattie's " Flora of the Northwest Coast " ; probably our common form 

 referred by us to M. sativa Mol. 



In conclusion, we are largely indebted to Professor C. V. Piper, of Washington, 

 D.C., for the identification of many of our plants which would not otherwise have 

 appeared in this List. 



