lO RANUNCULACEAE 



a ditch in a lane near Kennington. The plant with floating leaves 

 has usually been referred by British botanists to E. radians of Revel 

 in his Ranunculus de la Gironde, but Revel, in his Essai de la Flore du 

 Sud-Ouest de la France, loi, says that his radians differs from R. tricho- 

 phyllus by its floating leaves with non-caducous petals ; its more elon- 

 gated carpels, which are narrowed at the apex, are not swollen, and 

 have a rather long beak. Willkomm and Lange, in Prod. Fl. Hispan. iii. 

 911, say that the variety with floating leaves, which may be confused 

 with R. confusus and R. Baudoiii, may be distinguished from them by 

 the more hairy receptacle. Its conical, not globose, receptacle differen- 

 tiates it from forms of R. ijeltatus. 



R. trichophyllus has sometimes glabrous and sometimes hispid foliage. 

 When growing in calcareous water it becomes encrusted, and the 

 foliage is necessarily more rigid. When it grows in soft peat water 

 the leaves are much more flaccid, so that they form a tassel when 

 lifted out of the water, but even then they are shorter than typical 

 R. I>rouetii. The specific name was given on account of the hair-like 

 leaf- segments. 



The plant is recorded for all the bordering counties. 



R. Drouetii, F. Schultz, Arch. Fl. Fr. et Allem. (1847), 10. 

 Batrachium Brouetii, Nym. in Bot. Notiser (185a), 98. 



Top. Bot. 7. Syme, E. B. i. 22, t. 20. Nyman, 15. Fl. Oxf. 10. 

 Native. Lacustral. Ponds, ditches, streams, &c. P. May-June. 

 First record. Probably the Millefolium aquaticum cormdmn, Park. 1257, 



said in MerreWs Pinax, 78, 1666, to grow ' in the ditches of Oxford,' 



was this plant. 

 First certainly recorded by Mr. W. T. Dyer, in Journ. Bot. ix. (1871), 145. 



1. Isis. Bablock llythe, Byer. Near Inglesham. Bourton. Wytham 



meadows. 



2. Ock. Abundant in the meadows by the Thames near Sandford. 



Marcham. Didcot. Hagborne. Cholsey, abundant. Frilford. 



Letcombe. Ferry Hinksey. Near Hanney. 

 forma terrestris. This state occurred in a deep ditch near Wytham in 

 the dry summer of 1893. The upper leaves were succulent, but not 

 more entire than is usual. All gradations could be traced from this 

 mud form to the ordinary plant. R. Brouetii is rather frequent in the 

 Isis and Ock districts. It has a much more flaccid habit and lighter 

 green foliage than R. trichophyllus, and the flowers are slightly larger. 

 I have no notes of its occurrence in the remaining districts. It 

 would be rather curious to find that it is limited to the area of the 

 Oxford and Kimmeridge Clays. In Townsend's Flora of Hampshire it 

 is recorded from West Woodhay, which is just outside our county 

 boundary ; but it is a little singular that Mr. Reeks has not recorded 



