POLTGONACEiE. "" 243 



586. P. amphibium, L. 



Potamogeiton angustifol., Ger. (Merr.). Persicaria salicis fol. pereoinis. 



Potamog. angustif. dicta, R. Syn. iii. (Blackst.). 

 Cyb. Br. ii. 333. Syme E. B. viii. t. 1242 (water form). Curt. F. L. 



f. 4 (land form). 

 In ponds, streams, and marshes, also on rubbish and waste ground, and 



by roadsides ; very common. P. July — September. 

 Through all the districts. 

 VII. Bayswater Canal in Kensington Gardens, 1817 ; Herh. G. ^ R. Abun- 

 dant in the Serpentine, 1868. Hackney Marsh ! ; Mart. App. P. C. 

 66. Bound Pond, Kensington Gardens ; Pamplin. At the back of 

 Adelaide Road ; Syme. Zoological Grardens. Eel-brook Meadow. 

 Isle of Dogs. 

 First record : Merrett, 1 666. Both states are figured in Pet. H. B. Cat. 

 iii. fig. 12. Merrett's P. fol. salicinis, in a pond in St. James's Park; 

 Merrett, 93, is probably this species. 



587. P. lapathifolium, L. 



P. Pensylvanicicm, L. (Curt.) in part. 

 Cyb. Br. ii. 335. Curt. E. L. f. 1. 

 In cultivated ground ; common, A. July — September. 

 I. Harefield!; Newb. 



II. Bet. Sunbury and Hampton ! ; Newb. Staines. Hampton. Bet. 

 Hampton Court and Kingston Bridge. 



III. Near Hounslow. Twickenham. 



IV. Harrow Weald. Bet. Sudbury Ry. Station and Apperton. Waste 



ground by Child's Hill Grate. Hampstead ; Irv. MSS. 

 VI. Edmonton. 



Vn. Homerton ; Cherry {v. s.). Near South Heath, Hampstead. Back of 



Adelaide Road, N.W. Near Cremorne. Site of Exhibition of 1862, 



S. Kensington. Mount Street. Victoria Street. Edgware Road. 



First record : Petiver, 1713. About London ; H. B. Cat. The form with 



red perianths is probably Persicaria major lapathifoliis, cal. floris pur- 



pureo, pretty common about London; Mart. Tourn. ii. 166; mentioned 



also by Curtis (loc. cit.). The site of the Exhibition of 1862, at South 



Kensington, produced in 1867 a large crop of it. 



588. P. nodosum, Pers. (Bab.). P. lapathifolium, var. P nodosum 



(Syme E. B.) ; var. j8 laxum (L. Cat.). 

 P. laxum (E. B. Supp.). 

 Cyb. Br. Supp. 67, 98. E. B. Supp. 2822, reproduced in SjTue E. B. viii. 



t. 1240 (drawn from a Middlesex specimen). 

 Waste and cultivated ground, roadsides, &c. ; very common. A. July — 



September. 

 Through all the districts, but more abundant in those adjacent to the 



metropolis. 



