84 ZANNICHELLIACEAE 



19. P. pectinatus L. Throughout North America except Central 



America and the West Indies. Also in Europe. 



Conn. Hartford, Fairfield and Litchfield counties, not common. 

 N. Y. L. I., S. I., decreasing up the Hudson Valley to Pine 



Plains, Dutchess Co. 

 N. J. Sussex, Hunterdon, Bergen, Monmouth and Ocean counties. 

 Pa. Northampton to Chester counties. 



20. P. foliosus Raf. New Brims, to Br. Col., south to Fla., Mex. 



Also in Cuba, Porto Rico and Jamaica. 



Conn. New London, Hartford and Litchfield counties. 

 N. Y. L. I., S. I., to Westchester and Dutchess counties. 

 N. J. Common in the north, decreasing southward from Bergen 

 to Salem county. Not known from the pine-barrens. 



21. P. Hillii Morong. N. Y. to Mich, and Lake Superior, south 



to Pa. and Wise. Rare in our area. 

 Conn. Salisbury, Litchfield Co. 

 N. Y. Pine Plains, Dutchess Co. 



22. P. compressus L. (P. Zoster aejolius Schum.). N. B. to Br. 



Col., south to N. J. and Ore. 



Conn. Litchfield Co. 



N. Y. Jamaica, L. I., and in Westchester, Putnam and Dutchess 



counties. Rare. 

 N. J. Bergen and Sussex counties. 



23. P. obtusifolius Mert. & Koch. Quebec to Minn., south to 



N. Y. and Kan. 



Conn. Newtown, Fairfield Co. 



Pa. Northampton and Wayne counties. 



24. P. pusillus L. (including P. gemmiparus Morong). Through- 



out the LInited States and northern Mexico. 



Almost throughout the range, one of the commonest pondweeds. 



25. P. confervoides Reich. N. Eng. to N. J. and Pa. Perhaps in 



Fla. 



Known definitely only from Ocean, Burlington, Atlantic and 

 Gloucester counties, N. J. 



The reported occurrence of P. nitens Webb, in the range has never been satisfactorily 

 established. 



