ZANNICHELLIACEAE 7 



Also in Eu. and Asia. — Pennsylvania : Northampton ; Huntingdon, 

 Juniata River ; Lancaster ; Erie. 



2. Potamogeton Oakeslanus Robbins. Oakes' Pondweed. (Man. 

 p. 42 ; I. F. f. 143. ) In still water, Anticosti to N. J. and Pa. — Pennsyl- 

 vania : Monroe, Pocono Plateau. 



3. Potamogeton amplifoliusTuckerm. Large-lEaved Pondweed. 

 (Man. p. 43 ; I. F. f. 144.) In lakes and ponds, Ont. to Br. Col., Conn., 

 Ky. and Neb. — Pennsylvania : Northampton ; Lehigh ; Bucks, Bristol. 



4. Potamogeton pulcher Tuckerm. Spotted Pondweed. (Man. p. 

 43 ; I. F.y. i4§. ) In slow streams or ponds, Me. to Mo. and Ga. — Penn- 

 sylvania : Northampton ; Lehigh ; Bucks, Bristol ; Franklin, Mer- 

 cersburg. 



5. Potamogeton Nuttallii Cham. &Sclilecht. Nuttall's Pondweed. 

 (Man. p.43 ; I. F. f. 146.) In ponds and streams, N. S. to Pa. and S. C. 

 — Petmsylvania: Monroe, Tobyhanna; Northampton, Easton ; Ches- 

 ter, Oxford ; LANCASTER ; Clinton, Beaver Meadows ; Lycoming, Sus- 

 quehanna River ; Warren ; Centre, Bear Meadows ; Erie. 



6. Potamogeton alpinus Balbis. NORTHERN Pondweed. (Man. p. 

 43 ; I. F./. 147.) In ponds, N. S. to Br. Col., N. J. and Calif. Also in 

 Eu. — Petmsylvania : Lycoming, Susquehanna River ; Huntingdon, 

 Little Juniata River ; Lancaster, Susquehanna River. 



7. Potamogeton lonchites Tuckerm. Long-leaved Pondweed. 

 (Man. p. 43; I. F. /". 14S.) In ponds and slow streams, N. B. to Wash., 

 Fla. and Calif. — Pennsylvania: Northampton, Easton; Lycoming; 

 Delaware ; Lancaster, Safe Harbor ; Dauphin, Harrisburg ; Hunt- 

 ingdon, Alexandria. 



8. Potamogeton heterophyllus Schreb. Various-leaved Pond- 

 weed. (Man. p. 44; I. F. f. /JO.) In still or flowing water, nearly 

 throughout N. A. Also in Eu. — Pennsylvania : York, McCall's Ferry ; 

 Lancaster ; Erie. 



8a. P. heterophyllus graminlfolius (Fries) Morong. (Man. p. 44.) — 

 With the type. Erie, Presque Isle. 



9. Potamogeton Zizii Rolh. Ziz's Pondwehd. (Man. p. 44 ; I. F. 

 y"' ^S3-) III lakes and streams, Quebec to Mont., Fla. and Wyo. 

 Also in Eu. — Pennsylvania : Crawford ; Erie, Presque Isle. 



10. Potamogeton lucens L. Shining Pondweed. (Man. p. 45; 

 I. F. /. 134.) In ponds, N. S. to Calif., Fla. and Mex. Also in Eu. — 

 Pennsylvatiia : Specimens apparently referable to this species have been 

 collected in the Susquehanna and Delaware Rivers. 



11. Potamogeton perfoliatus L. Clasping-leaved Pondweed, 

 (Man. p. 45 ; I. V.f. 136.) In ponds and streams, Newf. to Br. Col., Fla. 

 and Calif. Also in Eu. and Asia. — Pemisylvania : Northampton, Dela- 

 ware River; Delaware; Lancaster, Susquehanna River; Dauphin, 

 Susquehanna River ; Lycoming, Susquehanna River ; Huntingdon, 

 Juniata River. 



11a. P. perfoliatus Richardsonii A. Bennett. (Man. p. 45.) — North- 

 ampton, Easton. 



