i64 REPORT OF NEW JERSEY STATE MUSEUM. 



Potamogeton pusillus Iv.* Small Pondweed. 



Potamogeton pusillum Linnaeus, Sp. PI. 127. 1753 [Europe]. — Britlon 258. 



Similar situations to the next, but apparently less common. 



Middle District. — Kaighns Pt. (NB), Swedesboro, Woodstown. 

 Cape Afajj.—Cape May Pt. (OHB). 



Potamogeton diversifolius Raf. Rafmesque's Pondweed. 



Potamogeton diversifolius Rafinesque, Med. Rcpos. (II.) V. 354. 1808 

 [Carolina].— Barton, Flor. Phil. 96, 1818.— Torrey, Flor. U. S. I. 197. 

 1824. — Brown and Keller 23. 



Potamogeton setaceum Pursh, Fl. Am. Sept. I. 120, 1814. 



Potamogeton hybridus Britton 257. 



Ponds and streams throughout the State except in the Pine 

 Barrens. 



Fr. — Early July into September. 



Middle District.— Ocezn Grove (UP), Delanco, Brown's Mills (UP). Cen- 

 ter Square. Landisville. 

 Coast Strip. — Manahawkin. 

 Cape A/a3?.— Dennisville (OHB), Bennett, Cape May (OHB). 



Potamogeton dimorphus Raf. Spiral Pondweed. 



Potamogeton dimorphus Rafinesque, Am. Mo. Mag. I. 358. 1817 [Pennsyl- 

 vania]. 

 Potamogeton spirillus Britton 257. — Keller and Brown 23. 



Northern New Jersey, extending into the Middle district along 



the Delaware river. 



Fr. — Late June into August. 



Middle District.— Fish House, Westville (KB). 



Potamogeton pectinatus L. Fennel-leaved Pondweed. 



Potamogeton pectinatus Linnaeus, Sp. PI. 127. 1753 [Europe]. — Torrey, Fl. 

 U. S. I. 198, 1824.— Britton 258. 



* The Woodstown specimen referred to by Keller and Brown as P. foliosus 

 proves to be P. pusillus. 



t We find no evidence of the occurrence of P. rohbinsii within the limits of 

 our list, although it occurs in the northern counties. P. pectinatus is given 

 as occurring in Monmouth Co. in Willis' Catalogue on Torrey's authority, 

 but there is no specimen from this locality extant. The records given for the 

 two species by Keller and Brown at Island Heights and Pleasant Mills, respec- 

 tively, are based upon specimens in the Academy herbarium, which prove to 

 be P. confervoides. 



