aracejE. 247 



On stagnant water. A. June, July. 

 Common throughout the county. 



3. L. polyrrhi'za Linn. 



Lyons, 49. M. PI. 21. Eelh. 374. 



First noticed by Mr Lyons. 



On water. A. Flowers have not been seen. 



1, 4, 5, 6. In still spots by the side of the river Cam 

 and ditches adjoining, abundantly. — 3. Eltisley. — 5. Reche 

 Lode!; H. Wicken Fen. — 7. Doddington. 



4. L. glbba Linn. 



Eelh. ed. 1, 346; ed. 3, 374. 



On stagnant water. A. June to August. 



1. Hinton. — 2. Sawston; G. S. G. — 3. Sheep's Green, 

 Cambridge. Eltisley. Eversden; N. — 4. Dry Drayton. 

 Waterbeach Fen. — 5. Horningsey. Wicken Fen. — 6. Ely. 

 — 7. Doddington. — 8. Newton. Wisbech. 



POTAMOGETONACEM. 



Potamogeton Linn. 



1. P. natans Linn. Pond-weed. 



P.foliis latis splendentibus, R. C. 123. P. rotundifolivmi, 

 M. M. 16. P. natans, M. PI. 4. Relh. 67. 



Ponds and still waters. P. June, July. 



1. Wood Ditton. Stetch worth. Willingham. Fulbourn. 

 Dullingham. Hinton Moor ; J. M. — 2. Octagon Pond in Wim- 

 pole Avenue!; Haslingfield ! ; N. — 3. Gamlingay. Sheep's 

 Green, Cambridge. Pit near the spring-head at Hardwick. 

 Eversden. Kingston. Haslingfield. Croydon. Grantchester ! ; 

 H. Harston; Barrington; Bourn; Caxton; Eltisley; Crox- 

 ton; N. — 4. Pit to the south-west of Madingley Park. Dry 

 Drayton. — 5. Wicken and Bottisham Fens. — 6. Ely!; W. M. 



