- 40 - 



22. Potamogeton oakesianus Robbins Fig. 24, Map 24 



Common in acid waters of New England. Range extends 

 from Newfoundland west to Wisconsin, south to southern New 

 Jersey, southern Michigan and central Wisconsin. 



alkalinity: mean 8.1 mg/1; range 2.0-33.0 mg/1 

 pH: mean 6.5; range 5.6-8.9 



23. Potamogeton cr ispus L. Fig. 25, Map 25 



Common in alkaline waters at scattered locations 

 throughout western and southern New England and in polluted 

 ponds and streams in eastern Massachusetts. Originally 

 introduced from Europe this species has become a troublesome 

 weed in many ponds in western Massachusetts. Range extends from 

 Quebec west to Minnesota, south to Alabama and Texas; scattered 

 throughout the western states. 



alkalinity: mean 70.3 mg/1; range 12.0-170.0 mg/1 

 pH : mean 7.6; range 6.5-9.8 



24. Potamogeton amplif olius Tuckerman Fig. 26, Map 26 



Common throughout New England, often in deep water. 

 Range extends from Nova Scotia and the Gaspe Peninsula west to 

 British Columbia, south to Virginia, Georgia, Alabama, Arkansas, 

 and Oklahoma; scattered locations in the Pacific northwest and 

 California; most abundant in the Great Lakes region and the 

 northeast United States. 



alkalinity: mean 32.6 mg/1; range 3.5-123.5 mg/1 

 pH: mean 7.3; range 5.7-9.8 



25. Potamogeton pulcher Tuckerman Fig. 27, Map 27 



Locally abundant in acid waters from western Maine and 

 central New Hampshire south to coastal Connecticut. Range 

 extends west to scattered locations in Michigan and Wisconsin, 

 south to Georgia, Florida, Louisiana, and Texas. 



alkalinity: mean 10.3 mg/1; range 3.0-38.0 mg/1 

 pH: mean 6.6; range 5.6-7.5 



26. Potamogeton nodosus Poiret Fig. 28, Map 28 



Scattered at locations in eastern New England and 

 locally abundant in western New England. All locations in 

 eastern New England are in fast flowing streams and rivers, 

 mostly of low alkalinity. In contrast, however, it is usually 

 found in slow moving streams or ponds of high alkalinity in 

 western New England. Range extends from New Brunswick west to 

 British Columbia, south to Florida, Alabama, Texas, Arizona, 

 California, and Mexico. 



alkalinity: mean 77.8 mg/1; range 5.0-231.5 mg/1 

 pH: mean 7.8; range 6.8-9.5 



