EANUNCULACE^. 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 

 luxiiriant specimens not unfrequently closely approaches that of R. 

 keterop?/i/lbis, Fries ; which plant, however, we have not observed in 

 Middlesex. 



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

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

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



0. R. peltatus, E. B. S. 2965, reproduced in Syme E. B. i. t. 17 (drawn 

 from a Hampstead specimen). 



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



Woodready ; South Mims. 



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



IV. Near Finchley ! ; Ncwb. 



V. River Brent at Hanwell ! ; Warren. 

 V'll. Hampstead Well Pond, 1862 ; Salter and Newbould ; E. B. 8. he. cit. 

 Ponds near Hornsey Wood. 

 This seems less common in the county than R. 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, Sihth. 



Ran. aqiiat. alb., circinat. tenuiss. divis. fol.,fl. ex cdis long, pedic. imiexis, 



Fluk. I'hyt. (Blackst.). 

 Cyb. Br. i. 79 ; iii. 373 and 621 ; 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. MSS.] Resen-oir, side of 

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



First record: Blackstone, 1737. 



8. St. fluitans, Lam. 



Ran. aqv.al. alb. affine miUcfoUiim, maratriphi/Uon fluiiaus, Chabr. 



(Black.st.). R. ])cucedanil'olius. All. 

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



* The specimen labelled ' R. ciixinatus' in I/eib. Han:, bcinj R. Drouetii. this locality 

 is rendered doubtful. 



