KANUNCULACE^. 15 



Occurs in all the districts commonly (except II.), and is especially frequent 

 in I. IV. and VII. When growing on mud, its ' floating ' leaves are 

 often absent, and the flowers smaller. The form of the leaves in 

 luxuriant specimens not unfrequently closely approaches that of B. 

 keteropht/llus, Fries ; which plant, however, we have not observed in 

 Middlesex, 



A large plant, found at Harefield by Kev. W. W. Newbould, appears 

 to be B. jpseudo-fluitans of Syme. (See Syme E. B. i. 34.) The B. 

 fluitans of Melvill, 2, seems the same. (See Herb. Harr.) 



)8, B.'peltatus, E. B. S. 2965, reproduced in Syme E. B. i. t. 17 (drawn 



from a Hampstead specimen). 

 I. In many places: Stanmore Heath; Eastcott; Elstree reservoir; 

 Woodready ; South Mims. 



III. Hatch End (a small-flowered form). Roxeth ; Hind. 



IV. Near Finchley ! ; Newb. 



V. River Brent at Hanwell ! ; Warren. 

 VII. Hampstead Well Pond, 1862 ; Salter and Newbould ; E. B. S. loc. cit. 

 Ponds near Hornsey Wood. 

 This seems less common in the county than B. floribundus, with which it 

 is often found, and from which we can see no marks sufficient to dis- 

 tinguish it. We have therefore united them, following Syme in the 

 nomenclature. 

 First record: Johnson, 1629. 



7. R. circinatus, 



Ban. aquat. alb., cirtinat. temdss. divis. fol.,fl. ex alis long, -pedic. innexis, 



Phck. Thyt. (Blackst.). 

 Cyb. Br. i. 79 ; iii. 373 and 521 ; Comp. 81. Syme E. B. i. t. 15. 



Ponds and slow streams ; rare. P. June — August. 

 I. In a bog on Uxbridge Moor, plentifully ; Blackst. Ease. 83. 

 II. Staines Common. Bushey Park ! ; Newb. Queen's River, Hampton, 



abundant. 

 III. (Brook on road from Pinner to Harrow ; Melvill, 2.*) 

 VI. Pond in garden of Warren Lodge, Edmonton. 



VII. [Ditches in Tothill Fields; Blackst. MS8.] Reservoir, side of 

 London canal, nearly opposite the gas-works; Cherry (y.s.). 



First record : Blackstone, 1737. 



8. R. fluitans, Lam. 



Ban. aquat. alb. affine millefolium, maratriphyllon jiuitans, Chabr. 



(Blackst.). B. peucedanifolitis. All. 

 Cyb. Br. i. 78 ; iii. 374 ; Comp. 82. Syme E. B. i. t. 16. 



* The specimen labelled ' R, circinatus' in Herb. Harr., being R. Drouetii, this locality 

 is rendered doubtful. 



