ACKNOWLEDGEMENTS 



We wish to thank Drs. Robert R. Haynes, Eugene C. Ogden, 

 Arthur C. Mathieson and Edward G. Voss for their helpful 

 comments on the manuscript. We are also grateful to the 



" " ' " for use of their collections: 



, MASS, MAINE, NCBS , NHA, 

 . were prepared by C. Barre 



Hellquist . 



Artnur u. watnieson ana cuwara v 

 comments on the manuscript. We ; 

 curators of the following herbaria f( 

 BOSC, BRU, CONN, CUW, GH, HNH , KIRI , 

 NEBC, VT, YU. Illustrations i 



Programs of the New Hampshire Agricultural Experiment 

 Station are open to all persons without regard to race, color, 

 national origin or sex. The University of New Hampshire is an 

 Affirmative Action/Equal Opportunity Employer. 



