HTDROCHAEIDACEa;. 267 



HYDROCHARIDACE^. 

 HYDROCHARIS, Linn, 



641. K. BIorsus-Ranse, L. Frog-bit. 



Morsus Bancs (Lob.). Nymphaa alba minima, C. B. Pin. (Blackst., Park.). 

 Cyb. Br. ii. 473 ; iii. 515. Curt. F. L. f. 3 (drawn from a London plant). 

 Ditches and stagnant water ; rather common. P. July — September. 

 I. Harefield ; BlacTcst. Fasc. 65. Uxbridge, Lightfoot MSB. Colne near 



Iver Bridge ! ; Newb. 

 II. Staines Common ; Phyt. N. 8. iv. 263. Staines Moor ditches, abundant. 



Bet. Suubury and Hampton!; Ncwh. Hampton Court, 1862; W. 



Bell [v. s.). 



III. Thames at Twickenham, abundant, 1866; Masters. Marsh Farm, 



Twickenham. Pond on Hounslow Heath. Cran, by the bridge on 

 Hanworth Eoad. 



IV. Pond at Forty Green ; "Wembley Park ; Cole. 



V. Canal near Brentford ; Hemsley. Pond near Acton, towards Ealing ! ; 

 Newb. 

 VII. [By the Tower of London ; Loh. Adv. 258.] [Many ditches about 

 London; Park. Thcat. 1253.] [Near Blackwall, 1822, J.Taylor; 

 Herb. Young. Isle of Dogs, 1836; Young MSS. and Loncl. Fl. 

 109.] [Most abundant in the many stagnant ditches intersecting 

 the fields and market-gardens at Eanelagh, the neat-houses, the 

 willow-walk, and Tuthill fields, 1820-25; Pamplin.'] Near Stoke 

 Newington, Winch; New B. G. 101. 



First record : Lohcl, 1570; also first as a British plant. Seems to have 

 nearly disappeared from the immediate vicinity of London, where it 

 ■was formerly common. 



ELODEA, Rich. 



642. * B. canadensis, Michaux. Anacharis Alsinastrum (Bab.). Water 

 Thyme. 



Cyb. Br. ii. 474 ; iii. 615. Syme E. B. ix. t. 1446. 



Ditches, streams, ponds, &c. ; very common. P. June — August. 

 Throughout all the districts. 

 VII. Eiver Lea, bet. Lea Bridge and Upper Clapton, 1854, A. Evans; 

 Phyt. N. 8. i. 96. Ditches by the Thames near the Bishop's Palace, 

 Fulham ; Ibid. Ditches and streams at Hackney, &c., abundant. 

 Newington. Hornsey Wood. Hampstead Ponds. Serpentine, 

 Kensington Gardens, where it fiowers profusely. 

 First record: A. Emms, 1854. Almost certainly introduced into Great 

 Britain from North America about 1842 ; but it seems to have been 

 noticed in Ireland as early as 1836 (see Phyt. v. 88). Is there a 

 possibility of its being a native there ? 



t 



