ACKNOWLEDGEMENTS 



This work begun in 1969 by Albion R. Hodgdon and Frederic L. Steele was 

 abruptly truncated by a tragic automobile accident in August 1974 which 

 severely disabled Dr. Hodgdon. Dr. Hodgdon died December 31, 1976. Dr. 

 Garrett E. Crow, Plant Taxonomist and Curator of the Albion R. Hodgdon 

 Herbarium of the University of New Hampshire, joined this effort to see this 

 work to its completion. 



We would especially like to thank Dr. Edward G. Voss, University of 

 Michigan, for his helpful comments on the manuscript, particularly regarding 

 nomenclature. Dr. Arthur Mathieson, University of New Hampshire, also kindly 

 reviewed the manuscript. Line drawings were prepared by Jessica Straus. 



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. 



