12 RANUNCULACEAE 



maston. Burghfield. A pretty form occurs in Wigmoreash 

 Pond on Gibbet Hill, at 912 feet elevation. In the Kennet near 

 Newbury. Padworth. Snelsmore. Lambourn. Inkpen. 



5. Loddon. Early, Ruclge, in Herb. Brit. Mus. 1800. Wokingham, 

 Watson. Hurst. A mud form from old moat in Whistley Park, 

 Melvill. A robust form occurs in the ditch near Early Heath. 

 A form apjjroaching li. truncatus occurs in a pond at Early. 

 Winkfield. Arborfield. Shurlock Row. In the Blackwater. 

 Shottesbrooke. Spencer's Wood Common. Plentiful in Vir- 

 ginia Water. Near Wargrave. Near Cookham. Maidenhead. 

 Binfield. Ruscombe. 

 Var. PSEUDO-FLUiTANs, Syme, E. B. i. 20. 



E. penicillatus, Bab. Man. Brit- Bot. ed. 7, 7 (1874). Batrachium peni- 

 cillatian, Dumort. in Bull. Soc. Bot. Belg. vol. ii. (1863 , 216. Syrae, 

 E. B. i. 20. Fl. Oxf. ir. 



1. Isis. The marshy meadows about Oxford are intersected by 



numerous anastomosing branches of the Thames. In early 

 summer these are often covei-ed by dense masses of an aquatic 

 Ranunculus bearing a profusion of large and handsome flowers. 

 It seems to be a state of R. Jlorihundus, Bab., without floating 

 leaves, which is all I take R. pseudo-fluitans to be. W. T. Dyer, in 

 Journ. Bot. ix. (1871), 145. Lechlade. Wytham, &c. 



2. Ock. Abingdon Canal. Aston Tirrel. Kennington. Cholsey. 



Wantage. BI wtury. 



3. Pang. Tidmarsh. Bucklebury. Standford Dingley. Pang- 



bourn. Bradfield ; also as a mud form in 1894. An abundant 

 and freely flowering plant in the Pang. 



4. Kennet. Hampstead Marshall. Newbur3\ Welford. Weston, 



Shefford. Bagnor. An a 1 undant plant in the Lambourn. 



5. Loddon. Sonning, Rudge, in Herb. Brit. Miis. t8oo. Reading, 



French. Wargrave in the Thames, Melvill. 



This is a eo mon form of R. peltatus, and next to that is probably 

 the commonest Batrachian. The long leaf-segments, which collapse 

 into a tassel when taken out of the water, distinguish it from the type 

 even when it produces floating leaves, which is not usually the case. 

 It may be distinguished from R. Jluitans by the more hispid receptacle, 

 and by the leaf-segments, which are shorter and more numerous. Like 

 the other Batrachiaus this plant also occurs as a mud form. The 

 upper floating leaves when produced are different in outline from 

 R. peltatus, being frequently more deeply cut into more irregular 

 segments. Probably Mr. Dyer's plant was a young state of R. peltatus. 



Ranunculus peltatus as here defined includes R. Jloribundus, Bah. 

 in Trans. Bot. Soc. Edinb. v. (1858), 77, but which appears to be scarcely 

 woithy of varietal distinction, since the characters of contiguous as 



