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ZOSTERACEAE 



Zostera (Eelgrass) 



Submersed plants of estuaries and sea water along the 

 coast; arising from rhizomes; flowers unisexual, borne in rows 

 on the upper side of a leaf-like spathe. 



1. Zostera marina L. Fig. 1, Map 1 



Common in estuaries, bays and along the open coast. The 

 taxon in New England is treated as var . stenophylla Aschers. 

 and Graebn. by Fernald (1950). Range extends from Greenland to 

 Florida and along the west coast of the United States and 

 Canada. 



Selected References 



Setchell, W. A. 1929. Morphological and phenological notes on 

 Zostera marina L. Univ. Calif. Publ. Bot. 14: 389-452. 



Setchell, W. A. 1933. A preliminary survey of the species of 

 Zostera. Proc. Natl. Acad. U.S.A. 19: 810-817. 



POTAMOGETONACEAE 



Flowers several to many, exerted above stipule at anthesis, 

 stamens 4; fruit sessile on a cylindric spike (fig. 3A) , 

 sometimes appearing capitate; floating leaves (fig. 9A) 

 present or absent; stipules free from leaf blade (fig. 

 18B) or if fused with leaf blade, then the tip free (fig. 

 3B) . 

 1 . Potamogeton 



Flowers 2, enclosed in leaf sheath at anthesis, stamens 2; 

 fruit long-stalked (fig. 37A) ; floating leaves absent, 

 stipules fused with leaf blades, free tip lacking (fig. 

 37B) . 

 2 . Ruppia 



