HYDROCHARIDACE^. 267 



HYDROCHARIDACE^. 



HYDROCHARIS, Linn, 



6ftl. B. XMCorsus-Ranse, L. Frog-bit. 



Morsiis BancB (Lob.). Nymphcea alba minima, C. B. Bin. (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 ; Blackst. Fasc. 65. Uxbridge, Lightfoot M8S. Colne near 

 Iver Bridge ! ; Newb. 

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

 Bet. Sunbury and Hampton!; Ncwb, 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 ; Lob. Adv. 258.] [Many ditches about 

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

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

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

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

 willow- walk, and Tuthill fields, 1820-25; Pamplin.l Near Stok 

 Newington, "Winch; New B. G. \Q\. 



First record : Lobel, 1570; also first as a British plant. Seems to havt 

 nearly disappeared from the immediate vicinity of London, where i' 

 was formerly common. 



EIODEA, Bich. 



642. ^ E. canadensis, ilfzcto^a;. Anacharis Alsinastrum (Bab.). Water 

 Thyme. 

 Cyb. Br. ii. 474 ; iii. 515. 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 ; 3id. Ditches and streams at Hackney, &c., abundant. 

 Newington. Hornsey Wood. Hampstead Ponds. Serpentine, 

 Kensington Gardens, where it fiowers profusely. 

 First record: A. Evans, 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 ? 



