114 ROCHESTER ACADEMY OF SCIENCE. [Oct. 8, 



1031. T. maritima L. 



Common in Bergen swamp. Wayne county. 



428. SCHEUCHZERIA L. 



1032. S. palustris L . 



Rare. In sphagnum bogs at Mendon. Wayne county. 



429. POTAMOGETON Tourn. [L.] Pond-weed. 



1033. P. natans L. 



Ponds and stagnant water ; common. 



1034. P. fluitans Roth. [P. lo7ichites Tuckerm.) [P. lo7ichites Tuckerm.] 



Genesee river, Irondequoit bay, Long pond, etc. 



1035. P. amplifolius Tuckerm. 



Irondequoit bay, Long pond, etc . Wayne county. 



1036. P. heterophyllus Schreb. [P. gramineus Fries.) 



Irondequoit bay, etc. ; common. 



1037. P. lucens L. 



Genesee river, Irondequoit bay, etc. ; frequent. 



1038. P. praelongus Wulf. 



Wayne county. 



1039. P. perfoliatus L . 



Bays, ponds and slow streams ; common. 



1040. P. crispus L . 



Long pond, Dr. Anna H. Searing . 



1041. P. zosteraefolius Schum. (P. compressus Man.) 



Frequent in Irondequoit bay, Long pond, etc. 



1042. P. pauciflorus Pursh. [P. foliosus Raf.] 



Near Rochester, Dr. C. M . Booth. Wayne county. 



1043. P. pusillus L. 



Irondequoit bay. Wayne county, E. L. Hanke?ison . 



1044. P. pectinatus L. 



Genesee river, bays, ponds, etc. ; common. 



1045. P- Robbinsii Oakes. 



Irondequoit bay, etc. ; common. 



4 30. ZANNICHELLIA Micheli. [L.] 



1046. Z. palustris L. 



Irondequoit bay, etc. ; not common. The var. pedwiculata occurs in 

 Thomas's creek, Brighton, Dr. C. M. Booth. 



431. NAIAS L. Naiad. 



1047. N. marina L. var. recurvata (?) Dudley. 



Abundant in two of the coves and sparingly elsewhere in Ironde- 

 quoit bay. 



1048. N. flexilis Rostk. & Schmidt. \N . flexilis (Willd.) Rostk. & Schmidt.] 



Bays, ponds, etc. ; common. 



