-30- 



SPARGANIUM L, 



sp. Bur-reed 



Rare; a few sterile plants growing in shallow water in 

 South Pool. It is impossible to determine species 

 without fruiting material. Harris (1975) reports eight 

 species of the genus as occurring in Essex County. MJM 

 1248. 



ZOSTERACEAE (Pondweed Family) 

 POTAMOGETON L. 



P. oakesianus Robbins Pondweed 



Rare; small pool in dunes east of parking lot 6. MJM 

 739 . 



P. pectinatus L. Sago pondweed 



Occasional; locally abundant in South Pool. MJM 644 , 

 1254 . 



P. perfoliatus L. Pondweed 



var. bupleuroides (Fern.) Farwell 



Common; North pool and locally abundant in small pond on 

 Stage Island. MJM 868 , 1174, 1328 . 



P. pusillus L. Pondweed 



var. tenuissimus Mert. and Koch 



Occasional; locally abundant in deep pool in dunes 

 between parking lots 1 and 2 and in North Pool. MJM 488 , 

 863 . 



RUPPIA L. 



R. mar itima L. Widgeon Grass 



Frequent; in shallow pools in salt marsh. MJM 1087 , 

 1229. 



