POTAMOGETON 517 



The locality reminds me very much of the spot in which I gathered 

 this species, near Diss, in Norfolk ; there it was associated with Chara 

 polijacantha. 



P. coloratum does not appear to be recorded for any of the neighbouring 

 counties. 



P. alpinus, Balb. Misc. 13 (1804). 



P. rufescens, Sehrad, in Chamisso Adn. ad Fl. Berol. 4 (1815). P. o&- 

 tusus, Ducros in Gaud. Fl. Helv. i. 468 (^1828). P. Jhiitans, Sm. 

 E. B. t. 1286, not of Koth. 



Top. Bot, 419. Syme, E. B. ix. 30, t. 1402. Nyman. 68r. Fl. Oxf. 282. 



Native. Lacustral. Streams, pools, and ponds. Rare and local. P. July. 



First certainly recorded by the author in this Flora. 



[4. Kennet, Hampstead (Marshall) Ponds, Russell's Cat. 1839. These 

 ponds have been searched by me on more than one occasion un- 

 successfully. P. natans, which is not given by Mrs. Russell, occurs 

 there with reddish foliage, and I suspect an error of identifica- 

 tion, as I have had this form of P. naians sent me as P. rufescens. 

 A semi-descriptive name leads not unfrequently to error. The 

 locality is not an unlikely one, and that or some portions of 

 the Kennet stream may yet afford the true plant, but it cannot 

 be admitted for this district until verified.] 

 5. Loddon. On the same day on which I gathered P. Jluitans I was 

 fortunate enough to meet with this species flowering freely in 

 thi-ee different places on the Loddon between Twyford and 

 Loddon Bridge. I think its abundance that year was partly 

 due to the unusual amount of sunshine. All our submerged 

 species were more than usually common ; this species developed 

 its floating leaves, and the contrast with P. Jluitans was very 

 pleasing. Later in the same year my friend, the Rev. H. J. 

 Ridclelsdell, who was with me when I first found it, met with it 

 in a pool on Bagshot Heath. Subsequently I found it in some 

 quantity in Virginia Water, both in Berkshire and Surrey. It 

 occurs very sparingly near Sandhurst. 

 The var. Jwmophyllus (sub P. rufescens, Syme, E. B. 31), appears to be 



only a submerged state. 



P. alpinus, under the name of P. rufescens, is recorded in Mr. Britten's 



Contributions as having been gathered by Mr. Boswell, who however 



tells me he has never seen it in Berkshire. It is recorded for all 



the bordering counties except E. Gloucestershire. 



[P. GRAMixEUM, Llun. Sp. PI. 127 (i/Ss). P. heteropliyllus, Schreber, Spic. Fl. 



Lips. 21 (i-jji). 

 Top. Bot. 418. Syme, E. B. ix. 35, t. 1406. Nyman, 682. Fl. Oxf. 283. 



Error? Recorded as P. Proteus in Mr. Britten's Contributions^ 1871, for the 

 northern division of the county, on the authority, it is stated, of Mr. Boswell ; 



