248 POTAMOGETONACE^. 



[P. polygonifdlius (Pourr.) 



I have a note of finding this plant at Gamlingay in May, 

 1852, but do not possess a specimen. It is probable that it 

 ■was the true plant, but uncertain.] 



2. P. plantagineus Ducr. 



Ann. Nat. Hist. ii. 350. Suppl. to Eng. Bot. fol. 2848. 



First found by the .Rev. Leonard Jenyns in 1827. 



Peaty ditches. P. June, July. 



2. Melbourn Common. Sawston Moor; N. In the Pud- 

 dry Brook near Ashwell; Fl. Hertf. — 3. Great Eversden; N. 

 — 4. Brick-pits by the Ely road. — 5. Bottisham and Wicken 

 Fens.— 6. West Fen, Ely. By Sandy's Cut; K— 7. Dod- 

 dington Turf-fen. 



3. P. rufescens Schrad. 



Hensl. Cat. ed. 2, 58. 



Ditches. P. July. 



5. Bottisham Fen. Burwell; G. S. G. 



3. P. heterophyllus Schreb. 



P. palustre, Belh. ed. 2, 64. P. heterophyllum, Belh. ed. 

 3, 67. 



Ponds and ditches. P. June, July. 



1. "WTTbraham. Fen!; H. Shelf or d Common; Belh. 

 West Wratting?. — 3. Gamlingay; H. — 5. Wicken, Swaff- 

 ham, and Bottisham Fens. 



4. P. llicens Linn. 



P. longis acutis foliis, R. C. 124. P aquis immersum 

 folio pellucido lato oblongo acuto, M. M. 16. P. lucens, 

 M. PI. 4. Belh. 68. 



Deepish water. P. June. 



