NAIADACEAE. 23 



8. PoTAMOGETON PERFOLiATUS L. M. p. 45. Ponds and streams. Summer. 



9. PoTAMOGETON CONFEBVOIDES Eeichb. M. p. 45. Cold ponds. Summer.. 



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

 Camden — Atco (C). Gloucester — Malaga (C). Atlantic — Mill pond 10 

 miles west of Atlantic City (He.). Ocean— Forked River (Cr.) (He.). 



10. POTAMOGETON CRISPUS L. M. p. 46. Flowing or stagnant, fresh or 



brackish water. Summer. 

 Lancaster— Conestoga Creek (P.). N ortJiampt on— IjQh'igh River 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 River (P.). 



12. POTAMOGETON FOLiosus Raf. M. p. 46. Ponds and streams. Summer. 



5Mcts— Sellersville (Fr.). La/ic'asfer— 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— CP.). Northampton — 'Easton (P.). 



14. POTAMOGETON PUSiLLUS L. M. p. 47. Ponds and slow streams. Sum- 



mer. 



15. POTAMOGETON DiVERSiFOLius Raf. M. p. 48. Shallow or stagnant 



water. Summer. 



16. POTAMOGETON Spibillus Tuckerm. M, p. 48. Ponds and ditches. 



Summer. 

 Bucks— Bock Kill (Fr.). Detott-are— Haverford (Fu.) (B. Sm.). Lan- 

 caster—Susquehanna (Cr.). 



Co Widen- Delaware River (C). GZotfcester- Westville (Li.). 



17. POTAMOGETON PECTiNATus L. M. p. 49. Fresh, brackish, or salt water. 



Summer. 



La/icasier— Susquehanna (Cr.) (Le.) (Pr.), Peach Bottom (Pr.). 

 Le/ii^jr/i- Salsburg (Kr.). Northampton— Black Horse Tavern (P.). 

 DaM2>/itn— Steelton (Wn.). 



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



18. POTAMOGETON RoBBiNSii Oakes. M. p. 49. Ponds and slow streams. 



Summer, 

 iancasier— Susquehanna River (P.). Northampton— 'Lehigh.'Rivev (P.). 

 Atlantic— VlQ&sant Mills, E. Difenbaugh (B. C). 

 New Castle— Canal, Delaware City, Commons. 



2. RUPPIA L. Ditch-Grass. 

 1. RuPPiA MARiTiMA L. M. p. 50. Shallow bays along coast. Summer. 



