I. FLOWERING PLANTS. 53 



Hammersmith and Putney, Surrey side ; and some equally fine trees 

 in the pastures adjoining Barnes Common.* Var. fastigiata occurs more 

 generally.* 



POTENTILLA FRAGARIASTRUM. Woods, bank, and dry pastures, frequent, 

 3-5. Dry banks in most of the lanes a short way out of London ;* 

 Hampstead Heath ;* Epping Forest, &c. 



POTENTILLA TORMENTILLA. Moors and heaths, common, 6-8. (Hampstead 

 Heath ;* Barnes Common.*) 



POTENTILLA REPTANS. Pastures and waysides, common, 6-9. Everywhere 

 in the outskirts.* 



POTENTILLA ANSERINA. Roadsides and moist meadows, frequent. Road- 

 sides almost everywhere ; in the outskirts ;* canal banks, &c.* 



POTENTILLA ARGENTEA. Pastures and roadsides, in a gravelly soil, not 

 common, 6-7. Wimbledon Common* (scarce) ; Moulsey Hurst ; lane 

 between Betchworth Park and the mill ; near Godalming, and on 

 Barnacle Hill ; Stonechalk pit ; about Bromley ; Epping Forest ;* near 

 Harefield ; Croham Hurst, and gravelly fields about Croydon ; banks of 

 the reservoirs near Barnes ;* sandy lanes and fields near Farnham ; 

 Shirley ; Addington ; between Dartford and Greenhithe ; slopes near 

 Milden's Wood, Godalming ; Gallows Plain, and elsewhere about Hert- 

 ford ;* about Hatfield Park ; gravel pit on Cook's Hill, Little Berkhamp- 

 stead ; about the Thames, Teddington, &c. ; near Byfleet, road to Cobham ; 

 road from church, Cobham to Fairmead ; St. Martha's Hill, Guildford. 



POTAMOGETON COMPRESSUS. See P. PUSILLUS. 



POTAMOGETON NATANS. Ditches, and slow streams, and stagnant waters, 

 frequent, 6-7. In many of the large ponds about London ;* Putney 

 Heath ;* pond below Totteridge, coming from Mill Hill, in abundance, &c.* 



POTAMOGETON POLYGONIFOLIUS. Bogs and small streams, frequent, 7. 

 Putney Heath ;* in all the bogs on the Surrey heaths ;* Bell Bar bog ; 

 Ball's Wood ; ditches, Harrow Weald Common. 



POTAMOGETON PRJELONGUS. Rare. Ditch adjoining the Thames at 

 Caversham Bridge, near Reading. 



POTAMOGETON RUFESCENS. Ditches and slow streams, not frequent. In 

 a pond not far from the large one near Totteridge, referred to in P. 

 natans (and, perhaps, also in that) ; in the Colne, on Colney Heath ; 

 ditches by the Colne, between Harefield Mill and Rickmansworth ; in 

 the Lea, near Chingford.* 



POTAMOGETON IIETEROPHYLLUS. Pools and ditches, not frequent (?), 6-7. 

 In the Basingstoke canal, near Woking ;* lake in Epping Forest, near 

 Wanstead. 



POTAMOGETON LUCENS. Lakes and streams, frequent, 7. Thames, in 

 many places ; Lea Canal,* plentiful (about Tottenham) ; Greenwich and 

 Woolwich marshes (in the ditches). 



POTAMOGETON PERFOLIATUS. Ditches, rivers, and ponds, frequent, 7. In 

 the Thames, about Weybridge,* Twickenham,* and elsewhere ; Padding- 

 ton Canal ; Lea River and canal ;* in the Colne. 



POTAMOGETON OBTUSIFOLIUS. Rare. Twickenham ; circular pond oppo- 

 site Kensington Palace. 



POTAMOGETON CRISPUS. Ditches and rivers, frequent, 6-7. Pond by the 



