104 



Sparganium. eurycarpum, Engelm. (Bor-eeed.) 

 " 1823 * * my first botanical discovery * * * observed in the exten- 

 sive marsh between Ipswich river and Wenham swamp ; communi- 

 cated to Nuttall, but it did not attract his attention " (Dr. Chas. 

 Pickering, Chron. Hist. PI., p. 1063). Common in slow waters. 



Sparganium siraplex, Suds. 

 "Outlet of Pleasant pond, Wenham, about 1860" (Dr. Chas. Pick- 

 ering). 



Var. NuttaUii, Engelm. 

 Foster's pond. North Beverly. 



Var. angustifoUum, Engelm. 

 Merrimac river, at Lawrence; Crane's pond, West Newbury. 

 Eare. 



MrAIADACE.a!. 



Note. — This order contains many species which are very difficult to 

 determine, and which require close observation of living specimens 

 in order that they may be correctly placed. Mr. Charles E. Faxon, of 

 Boston, who has carefully studied these plants from specimens col- 

 lected in the stations mentioned below, nearly all of which he has 

 himself visited, kindly revised the original list, adding many notes of 

 value. 



(PoNDWKKD Family.) 



Ifaias flexilis, Bostk. 

 Common in brooks and ponds. 



Naias Indica, var. gracillima, Braun. 

 In a springy bog at Sluice pond, Lynn, 1880 (Edwin Faxon). This 

 species is occasionally mef with in similar places, but no other au- 

 thentic specimens from Essex county have been found. 



Zannichellia palustris, L. (Horned Pondwekd.) 

 In the brook or "upper branch" of the Mill pond above the Atlantic 

 Car Works, Salem, in brackish water. 



Zostera marina, L. (Eel-Grass.) 

 Everywhere in salt water, below low tide mark, along the shore. 



Ruppia maritima, L. 

 In shallow, salt or brackish water, inlets, etc. Frequent. 



Potamogeton natans, L. 



Ponds and rivers. Common. 

 Var. prolixus, Koch. 



In flowing water, outlet of Chebacco pond, Ipswich river, etc. 



Frequent. 



