1050 



sylvaticus (W. & N.) y. echinatus (Bab.) 



Leightonianus (Bab. Syn.) Koehleri (W. & N.) y. pallidus (Bab.) 



carpinifolius (Fl. Shropsh.) e.J^uscus (Bab.) 



macrophyllus (W. & N.) hirtus (W. & N.) 



ft. Schlechtendalii. glandulosus (Bell.) y. rosaceus (B. S.) 



rudis (W. & N.) Schleicheri (Fl. Shropsh.) 



0. Leightonii (Bell-Salt.) nemorosus(Hayne.)^./ero:i;(W.&N.) 



fusco-ater (W. & N.) caesius (Linn.) 



Occurrence of Uclora Canadensis, a Plant new to Britain and Eu- 

 rope, near Market Harhorough, in Leicestershire. By Edward 



Newman. 



I AM indebted to Miss M. Kirby, of Leicester, who is also the ori- 

 ginal discoverer, for the information that a plant, not only new to 

 Britain, but also to Europe, has been found growing abundantly and 

 luxuriantly in certain reservoirs of the canal near Market Harborough, 

 in Leicestershire. In many instances of our new discoveries, single 

 specimens, or a few scattered plants have been esteemed sufficient to 

 warrant the introduction of a new name into our catalogues of British 

 plants : it has, however, very frequently turned out that the species 

 is clearly of exotic original, and its introduction merely accidental. 

 In the present instance, however, the case is widely different : the 

 plant has every appearance of being a true native, and I believe has 

 also been found, now that attention has been turned to Miss Kirby's 

 discovery, in three other widely separated British localities. 



I learn from our best botanists that this plant is the Udora cana- 

 densis of Nuttall, ii. 242, the Elodgea canadensis of Michaux, and 

 the Serpicula verticillata of Muhlenberg. It closely resembles the 

 plant figured under the last- mentioned name in Roxburgh's Coro- 

 mandel plants, although some botanists suppose it can scarcely be 

 the same, and it is mentioned in Mr. Dennes' Report on a preceding 

 page as Anacharis alsinastrum of Babington, but I know not whether 

 this name is published, or merely given provisionally, under the im- 

 pression that the plant was previously undescribed. 



Not the least interesting fact connected with the 'discovery is the 

 remarkable history of the physiology and economy of the plant, which 

 is identical with that of Valisneria. Edward Newman. 



Devonshire Street, Bishopsgate, 

 27th November, 1847. 



