- 68 - 



Hellquist, C. B. 1978. Potamogeton gramineus with adnata 

 stipules. Rhodora 80: 591-593. 



Mehrhoff, L. J. 1978. Rare and endangered vascular plant 

 species of Connecticut. The New England Botanical Club in 

 cooperation with the U. S. Fish and Wildlife Service 

 [Newton Corner, MA]. 40 pp. 



Metcalf, F. P. 1931. Wild-duck foods of North Dakota lakes. 

 U. S. Dept. Agr. Tech. Bull. No. 221. 72 pp. 



Ogden, E. C. 1943. The broad-leaved species of Potamogeton of 

 North America north of Mexico. Rhodora 45: 57-105, 

 119-163, 171-214. 



Reznicek, A. A. and R. S. W. Bobbette. 1976. The taxonomy of 

 Potamogeton subsection Hybr idi in North America. Rhodora 

 78: 650-673. 



Richardson, F. D. in press. Ecology of Ru ppia mar itima L. in 

 New Hampshire (U.S.A.) tidal marshes. Rhodora 82. 



Storks, I. M. and G. E. Crow. 1978. Rare and endangered 

 vascular plant species of New Hampshire. The New England 

 Botanical Club in cooperation with the U. S. Fish and 

 Wildlife Service [Newton Corner, MA]. 73 pp. 



