20 



Columbia, south to Florida, Alabama, Louisiana, and California; 

 Mexico and South America. 



alkalinity: mean 26.4 mg/1; range 1.5-290.0 mg/1 

 pH: mean 6.9; range 5.0-9.2 



7. Sagittaria cuneata Sheldon Fig. 12, 13, Map 12 



Common in northern New England, rare throughout the rest of the 

 region. This is another variable species. In deep water it may produce 

 sterile rosettes like those of S. graminea. Rosettes may also produce 

 floating leaves with a lanceolate or sagittate blade. In rivers extremely 

 broad, flat, linear leaves, similar to those of Vallisneria americana but 

 lacking the central lacunae band, are formed. When emersed the plant 

 forms sagittate or ovate leaves that tend to droop rather than stand 

 erect. Range extends from Gaspe County, Quebec west to British 

 Columbia, south to New England, New York, Ohio, Illinois, Iowa, 

 Kansas, Texas, New Mexico, Arizona, and California. 



Rare and endangered plant lists: New Hampshire, Massachusetts, 

 Connectict 



alkalinity: mean 36.7 mg/1; range 5.0-127.0 mg/1 

 pH: mean 7.4; range 6.8-8.9 



8. Sagittaria engelmanniana J. G. Smith Fig. 14, Map 13 



Common in acid waters of marshes, bogs and sandy ponds of 

 southeastern New England. The type locality is a sphagnum bog in 

 Uxbridge, Massachusetts. The species exhibits much variability in the 

 width of the sagittate leaves and sterile plants look similar to Sagit- 

 taria latifolia. The upright beak of the achene is the best diagnostic 

 characteristic for identification. Range extends from eastern Massa- 

 chusetts south to Florida. 



