54 A NEW LONDON FLORA. 



Palace, Eltham ; Keston Common (in the pond) ; in the Lea and Canal,* 



and in the canal at Greenford. 

 POTAMOGETON DENSUS. Ditches, frequent, 6-7. Plentiful in the ditch 



round the Palace grounds, Fulham.* 

 POTAMOGETON PUSILLUS. Ditches and still waters, not unfrequent, 6-7. 



Greenwich and Woolwich marshes, in the ditches there ;* river Cray ; 



Thames, about Twickenham ; ditches about Staines ; Lea Canal ;* Tring 



reservoir ; Cutmill ponds. (P. zosterifolius, a variety of the preceding.) 

 POTAMOGETON PECTINATUS. Rivers and ponds, not unfrequent, 6-7. 



Canal, Tottenham ;* river Cray ; pond near the Palace, Eltham ; 



Thames, about Staines, and between Hampton and Kingston Bridge ;* 



Ruislip reservoir ; Lea ; Roding ; Grand Junction Canal ; Serpentine. 

 POTAMOGETON ACUTIFOLIUS. Rare. N.W. corner of Colney Heath, in the 



Colne ; in a pool at London-Colney, E. side of the bridge. 

 POTAMOGETON PROTEUS. See P. HETEROPHYLLUS. 

 POTAMOGETON GRAMINEUS. See P. OBTUSIFOLIUS. 



POTERIUM SANGUISORBA. Dry, chalky pastures, common, 6-8. Every- 

 where on the chalk ; from the Hog's Back to the Medway ;* roads leading 



from Croydon to Selsdon and Sanderstead ;* from Dartford to Darent 



Wood ;* from Carshalton to Banstead ;* Tring ;* Herts, on the chalk. 

 PRIMULA VULGARIS. -Woods, copses, and hedgebanks, frequent, 4-5. 



(Coombe Wood, Wimbledon ;* copses about Harrow,* &c.) 

 PRIMULA VERIS. Meadows and pastures, common, 4-5. (Plentiful about 



Harrow,* Pinner,* Boreham Wood.*) 

 PRIMULA ELATIOR. Damp woods, rare, 4-5. Epping Forest (?) olim. ; 



about Coulsdon. 

 PRUNELLA VULGARIS. Pastures, frequent, 7-8. (Hampstead Heath,* and 



everywhere about London.*) 

 PRUNUS SPINOSA. Woods and hedges, common, 4-5. Some bushes on 



Hampstead Heath ;* everywhere in hedges in the environs ; segregate 



domestica, near Croham Hurst ;* hedges between Betchworth and 



Dorking ; about Reigate ; segregate insititia, in Epping Forest ; about 



Warley and Brentwood ; about Reigate. 

 PRUNUS AVIUM. Woods and hedges, rare, 5. Wood at Fyfield ; less 



uncommon, in Herts ; Bentley Priory ; Harrow Grove ; Harefield ; about 



Claygate and Oxshott ; Churlwood ; Redstone Hill. 

 PRUNUS CERASUS. Woods and coppices, not very frequent, 5. Croham 



Hurst ;* below Shooter's Hill, towards Eltham ; woods about Gatton ; 



copses on Reigate Hill,* and hedgerows on Colley Farm, below it ; 



Gatshall Copse, Godalming ; hedges, Harlow ; E. of Aldbury Nowers ; 



near Miswell, Tring ; Harrow Weald Common ; about Claygate, and 



between Hook and Chessington. 

 PRUNUS PADUS. Woods and coppices, rare, 5. About Hampstead (?) olim ; 



West Ham, between the Abbey and the London Road (?) olim ; hedges 



about Shiere and Gomshall ; near Epping ; N.E. side of Hatfield Park. 

 PSAMMA ARENARIA. Seashores, local, 7. Shoebury beach, abundant, 

 Pulmonaria officinalis. Rare, incidental, 5-6. Wood between Croydon and 



Godstone. 

 PYROLA MINOR. Woods, rare, 6-7. Beech woods, at Tring; Aldbury 



