aquatic pioneer successional of northeastern USA
declined after fire suppression, meadow drainage, and construction
References:
Niering, William A and Olmstead, Nancy C. Audubon Society Field Guide to North American Wildflowers. QK112.N53 1979 ISBN 0-394-50432-1 p.725
U.S. Department of Interior, National Biological Survey
U.S. Fish & Wildlife Service, Endangered Species Home Page
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