RANUNCULUS 1 5 



is R. Lenormandi, wliich, according to Willkomm and Lange, is distinguished 

 by not having a hirsute receptacle. 



a. tripartitus, which shovild be found in Berkshire, is recorded from Wilts, 

 Hants, and Surrey,] 



B. hederaceus, Linn. Sp. PI. 556 (1783). Ivtj-leaved Water-Crowfoot. 

 R. Hederaceus aquaiicus, Park. 12 16 (1640). Bairachium hederaceum, 



S. F. Gray, Nat. Arr. ii. 721 (1821). 

 Top. Bot. 2. Syme, E. B. i. 29, t. 26. Nyman, 16. Curt. Fl. Lend. 



iv. t. 39. Fl. Oxf. 12. 

 Native. Lacustral. Shallow streams, borders of ponds, wet places. 



Local, but widely distributed. P. Feb.-August. 

 First record. South Hinksey, Mr. Baxter's MSS. 18 12. Given in 



Russell's Cat. 1839. 



1. Isis. Faringdon. 



2. Ock. South Hinksey, Baxter. Near Childswell Farm, Thurland. 



Didcot. Abingdon. 



3. Pang. Standford Dingley. Near Bucklebury. 



4. Kennet. Newbury. Stroud Green Pond, Weaver. Hampstead 



Marshall. Greenham. Mortimer. Sandleford Priory. Enborne. 

 Snelsmore. Between Aldermaston and Silchester. Bagnor. 



5. Loddon. Early, Tufnail. Blackwater, Miss C. E. Palmer. Windsor 



Park, Ridley, in Herb. Brit. Mus. 1882. Near Wellington College, 

 Penny. Sandhurst. Finchampstead. Arborfield. Risely. 

 Ambarrow. Bulmarsh. Warren Row. Bearwood. 

 Var. R. (h)omiophyllus, Tenore, Flora Napolitana, vol. iv. 338 (1830). 

 Bairachium hederaceum, var. hoynoeophyllwn, Pryor, Fl. Hert. 12 (1887;. 

 This variety, which is perhaps only the floating state of R. hedera- 

 ceus, appears to be rare. I have only noticed it in the Loddon district, 

 where it occurs near Wokingham. Near Arborfield. Near Long 

 Moor. Near Finchampstead. 



In the Prod. Fl. Hispan. Willkomm and Lange, 1. c. 906, make 

 this as a species distinct from hederaceus. They distinguish it by 

 its more numerous carpels, which are about sixty in number (R. 

 hederaceus has from twenty to thirty \ by its floating and moro 

 robust habit, and by its much larger five-lobed leaves, of which 

 the lobes are sometimes crenate. These distinctions, which are only 

 those of degree, do not appear to me sufiiciently marked to warrant 

 the treating of the two plants as separate species. This plant differs 

 from all the other Batrachian Buttercups except R. tripartitus in 

 having none of the leaves cut into capillary segments. The much 

 smaller flowers distinguish it from R. Lenormandi, and the leaves of 

 the latter plant have not the dark markings which are generally 

 present in R. hederaceus. Its glabrous receptacle distinguishes it from 

 R. tripartitus. 



