5 



ACKNOWLEDGEMENTS 



We wish to thank Edward G. Voss, Carroll E. Wood, and Donald 

 H. Les for their helpful comments on the manuscript. We are also 

 grateful to the curators of the following herbaria for use of their 

 collections: BRU, CONN, CUW, GH, HNH, KIRI, MASS, MAINE, 

 NASC, NCBS, NHA, NEBC, VT, YU. A special thanks is extended to 

 Pamela Bruns Brayton who prepared the illustrations. Permission to 

 redraw some figures from Fassett's Manual of Aquatic Plants used in 

 Figure 7 was kindly provided by the University of Wisconsin Press. 



This work is a result of research sponsored by the New Hampshire 

 Agricultural Experiment Station. The NHAES reserves the right to 

 reproduce, publish or otherwise use, and to authorize others to use, the 

 work for Government purposes notwithstanding notice of copyright. 



Copyright £ 1984 by the University of New Hampshire. No part of this work may be 

 reproduced in any manner without permission from the authors and the University of 

 New Hampshire. 



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. 



