Aquatic Vascular Plants of New England: 



Part 6. Trapaceae, Haloragaceae, 



and Hippuridaceae 



by 

 G. E. Crow and C. B. Hellquisti 



INTRODUCTION 



This is the sixth in a series of reports on the aquatic and wetland 

 flora of New England. These reports are intended to aid conservation- 

 ists, fish and game personnel, consultants, botanists, and students in 

 the identification of aquatic plants. The coverage is strictly New 

 England but is of value throughout the northeast. Data have been 

 gathered from herbaria in New England and from personal field work. 



Chemical data presented represent samples from many waters 

 throughout New England. The alkalinity readings are total alkalin- 

 ity, expressed as milligrams per liter (mg/1) CaCO,. The number of 

 observations are included in parentheses following alkalinity and pH 

 values. Since pH and alkalinity vary greatly during the day, the 

 values are only indicative of the water quality. Chloride values are 

 given where data are available and of value. 



The rare and endangered plant lists referred to are those prepared 

 for each of the six New England states by the New England Botanical 

 Club in cooperation with the United States Fish and Wildlife Service, 

 Office of Endangered Species, Newton Corner, MA (RI — Church and 

 Champlin, 1978; MA — Coddington and Field, 1978; VT — Country- 

 man, 1978; ME — Eastman, 1978; CT — Mehrhoff, 1978; NH — Storks 

 and Crow, 1978). Taxa indicated as rare, threatened or endangered 

 for the entire New England Region are also noted (Crow et ai, 1981, 

 Rhodora 83: 259-299.) 



We invite comments and/or criticisms on this treatment. Infor- 

 mation on any species omitted or any known localities not docu- 

 mented by us will be welcomed. If anyone is interested in specific 

 localities of any of the species indicated on the dot maps, please 

 contact us. 



*Dr. Garrett E. Crow, Department of Botany and Plant Pathology, Nesmith Hall, 

 University of New Hampshire, Durham, NH 03824 



Dr. C. Barre Hellquist, Department of Biology, North Adams State College, 

 North Adams, MA 01247. 



