204 



POLYGONACE.E. 



2. P. amphibium Linn. 



Potamogeton angustifolium, R. C. 124. Persicaria Soli- 

 ds folio Potamogeton angustifolium dictum, M. M. 15. P. 

 amphibium, M. PI. 9. Rein. 161. 



Rivers, ditches, and bogs. P. July, August. 



1. Paper Mills, Cambridge. — 2. Near Duxford; N. 

 Peat-holes, Triplow. — 3. Gamlingay. Sheep's-Green, Cam- 

 bridge. Coton. Between Caxton and Eltisley; N. — 4. By 

 Madingley road. Waterbeach Pen. Aldreth Bridge. Fen 

 Drayton. Oakington; N. — 5. Bottisham Pen. Upware. 

 Reche.— 6. Ely. Witcham. — 7. Doddington Turf-fen.— 

 8. Wisbech; J. B. Near Peterborough. 



3. P. lapathifolium Linn. 



P. pensylvanicum, Lyons, 33. Relh. ed. 1, 33. P. lapa- 

 thifolium, Relh. ed. 3, 162. 



On rubbish and damp cultivated, land. A. July, August. 



Tolerably common throughout the county in both its 

 forms, viz. P. pallidum (With.) and P. nodosum (Pers.), but 

 more especially the former. 



4. P. laxum Reichenb. 



Suppl. to Eng. Bot. fol. 2822. 



First found in 1836 by C. C. B. 



Damp gravelly places. A. July to September. 



1. Stourbridge Fair Green. — 4. River-side below Water- 

 beach, plentifully. — 5. Wicken. — 6. River-side below Bar- 

 raway. — 8. Newton. Wisbech. 



5. P. Persicaria Linn. 



Persicaria mitis maculosa, R. C. 116. Per. maculata 

 officinarum, M. M. 15. P. Persicaria, M. PL 9. Relh. 161. 

 On rubbish and damp places. A. June to September. 

 Tolerably common throughout the county. 



