118 FLORA OF THE UPPER SUSQUEHANNA. 



P. Nuttallii Cham. <fc Schlecht. Almost as common as the pre- 

 ceding in ponds and streams. {P. Pen7isylv aniens Cham.) 



P. Spirillus Tuckerm. Spiral Pond Weed. •* Cayuta Lake." — 



Cayuga Flora. 



P. lonchites Tuckerm. Susquehanna river, Graves. Chemung 

 river, Z//Q'. Chenango river, Q?t////<?. {P. fltatans 'R.oth..) 



P. amplifolius Tuckerm. Large-leaved Pond Weed. Goodrich 

 Lsike, Hoy. Oy^iovd., Co7'il/e. "Cayuta Lake." — Cayuga Flora. 



P. heterophyllus Schreb. "Cayuta Lake." — Cayuga Flora, 



P. perfoliatus L. Clasping-leaved Pond Weed. Chenango 

 river, Coville. Chemung river, Lucy. Susquehanna river, 

 Graves. 



P. crispus L. Chemung river; not rare, Lucy. 



P. zosterasfolius Schum. Chenango river, Coville. Susque- 

 hanna river, Graves. 



P. pectinatus L. Fennel-leaved Pond Weed. Chemung river, 

 Lucy. Chenango river, Coville. Susquehana river, Graves. 



P. foliosus Raf. Chenango river at Oxford, Coville. {P. 

 pauciflorus Pursh. ) 



As yet our pond weeds are but little known. Further study 



of this group will certainly disclose more species within our 

 boundaries, and extend the list of stations for those that have 

 been identified. 



ZANNICHELLIA L. 



Z. paluBtris L. Horned Pond Weed. Below the feeder dam 

 in the Chenango river north of Oxford, Coville. The only 

 station. 



NAIAS L. 



N. flexilis (Willd) Rost. & Schmidt. Oxford, Coville. Unadilla 

 Forks, Prown. The only stations reported. 



ERIOCAULACE/E. 



HRIOCAULON L. 

 E. septangulare With. Sfaen-an(;led Pipewokt. Cinnamon 

 Luke, abundant, Lucy. The only station. 



