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8. Potamogeton epihydrus Raf. Figs. 9, 10, Maps 9, 10 



Abundant throughout New England in acid and alkaline 

 waters. Two varieties are recognized: the ubiquitous var. 

 ramosus [var. nuttallii of Fernald, (1950)] and the uncommon 

 variety epihydrus from alkaline waters of western and northern 

 New England. Only the extremes of these two varieties are easy 

 to distinguish. Range extends from Newfoundland and Labrador 

 west to southern Manitoba, and southern Alaska, south to western 

 North Carolina, Tennessee, northern Mississippi, Colorado, and 

 California; most abundant in the northeast. 



Leaves 5-10 mm broad, 7-13-veined; fruit 3-4.5 mm 



long, 3-3.6 mm broad. 



var. e pihydrus 



Leaves 1-8 mm broad, (3) 5-7-veined; fruit 2.5-3.5 mm 



long, 2-3 mm broad. 



var. ramosus (Peck) House 



variety ramosus 



alkalinity: mean 20.1 mg/1; range 2.0-245.0 mg/1 

 pH : mean 6.8; range 5.0-9.5 



variety epihydrus 



alkalinity: mean 62.5 mg/1; range 9.0-120.0 mg/1 

 pH: mean 7.5; range 6.8-8.6 



9. Potamogeton conf ervoides Reichenb. Fig. 11, Map 11 



Found in acid waters of New England along the coastal 

 plain and in high elevation lakes and ponds. This species is 

 found in waters of the greatest acidity in New England. The pH 

 may be as low as 5.0 and the alkalinity can approach 0.0 mg/1. 

 Potamogeton conf ervoides may be overlooked if not in fruit as it 

 blends in with Eleochar is acicular is , E. robbinsii and Scirpus 

 subterminalis , with which it is often associated. Range extends 

 from Newfoundland west to the Upper Peninsula of Michigan and 

 eastern Wisconsin, south to southern New Jersey, Pennsylvania, 

 and North Carolina. 



Rare and endangered plant list: Maine, Vermont, Connecticut 



alkalinity: mean 3.6 mg/1; range 0.5-7.0 mg/1 

 pH : mean 6.3; range 5.3-6.8 



10. Potamogeton zoster if ormis Fernald Fig. 12, Map 12 



Scattered throughout New England with population 

 concentrations in regions of higher alkalinity, particularly 

 along the western border. Range extends from the Gaspe 

 Peninsula of Quebec west to Manitoba, south to northern 

 Virginia, southern Ohio and Nebraska; a minor range extension 

 occurs from western Montana to British Columbia; south to 

 Oregon; isolated populations in northern Alberta and northern 

 California. 



