NAIADACEAE. 23 



8. Potamogeton perfoliatus L. M.-^p, 4Si Ponds and streams. Summer. 



9. Potamogeton confervoides Eeichb. .:M. p. 45. Cold ponds. Summer. 



Burlington— Atsion, Pleasant Mills (C), Brown Mills, Tuckerton (Te.). 

 Camden— Ateo (0.). Gloucester —Malaga ,(C). Atlantic— Mill pond 10 

 miles west of Atlantic City (He.). ,:£)cea»^Forked River (Cr.) (He.). 



10. Potamogeton crispus L. M. p. 46. Plowing 1 or stagnant, fresh or 



brackish water. Summer. 

 Lancaster — Conestoga Creek (P.). Northampton— Lehigh Eiver and 



Bushkill Creek (P.),, ,, . ,!,;:■■■ • ; :, 



Camden— In the Delaware (C). Hunterdon— In the Delaware (C). 

 .11. Potamogeton zosteraefolius Schum. M: p. 46. Still or running 

 water. Summer. . 

 Lancaster— Susquehanna Eisner (P.). ' 



12. Potamogeton foliosus Eaf. M. p. 46. Ponds and streams. Summer. 



Bucks — Sellersville (Fr.). Lancaster— Susquehanna, A. P. Garber'(B. 

 C), Paradise (St.). 



Salem — Salem, Woodstown (Li.). 

 New Castle — Common. 



13. Potamogeton obtusifolius Mert. & Koch. M. p. 46. Still water. 



Summer. 

 Lancaster— (P.). Northampton— Easton (P.).. 



14. Potamogeton pusillus L. M. p. 47. Ponds and slow streams. Sum- 



mer. 



15. Potamogeton diversifolius Eaf. ; M. p, ,48. , Shallow or stagnant 



water. Summer. 



16. Potamogeton Spirilltjs Tuckerm. , M. p. 48,, Ponds and ditches. 



Summer. 

 Bucks— EockHill (Fr.). Delaware— Hayerford (Pu.) (B. Sm.). Lan- 

 caster— Susquehanna ( Cr. ) . 



Camden— Delaware Eiver (C). Gloucester— Westville' (Li.). 



17. Potamogeton pectinatus L. M. p. 49. Fresh, brackish, or salt water. 



Summer. 



Lancaster— Susquehanna (Cr.) (Le.) (Pr.), Peach Bottom (Pr.). 

 Lehigh— Salsburg (Kr.). Northampton— Black Horse Tavern (P.). 

 Dauphin— Steelton (Wn.). 



Ocean— Island Heights (Mac). Hunterdon— In the Delaware (C). 



18. Potamogeton Eobbinsii Oakes. M., p. 49. Ponds and slow streams. 



Summer. 

 Lancaster— Susquehanna Eiver (P.), Northampton— Lehigh Eiver (P.). 

 Atlantic— Pleasant Mills, E. Difenbaugh (B. C). 

 New Castle— Canal, Delaware City, Commons. 



I 2. EUPPIA L. Ditch-Grass. 



1. BuPjpA maritima L. M- p- .50., Shallow bays along coast. .Sutnmer. 



