- 64 - 



Columbia/ south to Virginia, Ohio, Indiana, Iowa, and Oregon. 



alkalinity: mean 36.5 mg/1; range 4.0-245.0 mg/1 

 pH: mean 7.4; range 6.4-10.2 



3. N a j a s gracillima (A. Br.) Magnus Fig. 41, Map 41 



Locally abundant in acid waters, mainly of southern New 

 England. Range extends from Maine west to Minnesota, south to 

 Virginia, Kentucky, Alabama, and Missouri; one isolated station 

 in California. 



Rare and endangered plant list: Vermont 



alkalinity: mean 4.6 mg/1; range 2.5-9.0 mg/1 

 pH: mean 6.2; range 5.7-6.7 



4. Najas minor All. Fig. 42, Map 42 



Rare in alkaline waters of extreme western New England. 

 This European introduction has not made much movement eastward 

 into New England from New York where it is more abundant. Range 

 extends from western New England west to Michigan and Indiana, 

 south to Florida, Mississippi, and Arkansas. 



alkalinity: mean 101.0 mg/1; range 99.5-102.5 mg/1 

 pH: mean 7.8; range 7.3-8.2 



Selected References 



Clausen, R. T. 1936. Studies in the genus Najas in northern 

 United States. Rhodora 38: 334-345. 



Clausen, R. T. 1937. A new species of Najas from the Hudson 

 River. Rhodora 39: 57-60. 



Fernald, M. L. 1923. Notes on the distribution of Najas in 

 northeastern- Amer ica. Rhodora 25: 105-109. 



Haynes, R. R. 1977. The Najadaceae in the southeastern United 

 States. J. Arnold Arbor. 58: 161-170. 



Haynes, R. R. 1979. Revision of North and Central America 

 Najas (Najadaceae). Sida 8:34-56. 



Hellquist, C. B. 1977. Observations on some uncommon vascular 

 aquatic plants in New England. Rhodora 79: 445-452. 



Merilainen, J. 1968. Najas minor All. in North America. 

 Rhodora 70: 161-175. 



Morong, T. 1893. The Naidaceae of North America. Mem. Torrey 

 Bot. Club 3: 1-65. 



