14 RANUNCULACEAE 



3. Pang. In the Thames from Wittenham to Reading. 



4. Kennet. In the Kennet near Theale, and also near Southcote. 



5. Loddon. Sonning, Budge, in Herb. Brit. Mus. Near Sandford 



Mill, Melvill. Henley, frequent, Stanton. Between Wargrave 

 and Maidenhead in the Thames. 



On the Upper Thames I have seen the plant produce floating leaves, 

 when it is the var. Jieterophyllus of Clavaud, Flore de la Gironde, 21. 



There appears to he more than one form of this plant ; the flowers 

 certainly vary in size. Perhaps the smaller-flowered plant may be 

 B. Bachii, Wirtg. Verhandl. Preuss. Rh. ii. (1846), 12, which is de- 

 scribed as having a more slender stem, almost sessile leaves, and 

 narrower flowers. The unusually hot and dry summer of 1893 afforded 

 another state of this plant which has been called var. terrestris, Godr. 

 Mon. 29. Owing to the stream near Godstow being so much lower 

 than usual, the plant grew out of the water on the mud ; the segments 

 of the leaves then became more succulent, shorter, and broader. 

 Although the receptacle is often described as glabrous, in the young 

 state it is usually hispid. 



B. Jluitans is a frequent and characteristic plant in the Thames ; 

 it occurs in all the bordering counties. 



[R. Baudotii, Godr. in Mem. de I'Acad. de Nancy (1839), 21 ; Syme, E. B. 

 i. 24, t. 22, is said to be found in Hants and Surrey.] 



R. Iienormandi, F. Schultz, in Flora (1837), 727. 



Batrachium Lenormandi, F. Schultz, Arch. Fl. Fi*. et Allem. i. (1844', 70- 



Top. Bot. 10. Syme, E. B. i. 28, t. 25. Nyman, 16. Fl. Oxf. 12. 

 Native. Inundatal. Paludal. Wet places in heathy districts, 

 ditches, &c. Local and rather rare, confined to the south of the 

 county. P. June-August. 

 First record. Bagshot Heath, Mr. H. C, Watson, in Britten's Contrilu- 

 iionSj 187 1. 

 5. Loddon. Bagshot Heath, Watson. Roadside near Blackwater 

 below Finchampstead, Salmon. Windsor Park, Bolton Kitig. 

 In a ditch near Bracknell. Near Swinley. Near Wokingham. 

 This species, distinguished from B. hederaceus by its larger flowers, 

 which are five-, not three-nerved, has a very limited distribution in 

 the county. It occurs, so far as at present known, only on the Bag- 

 shot beds. 



It is found in Surrey, Hampshire, and Wiltshire. 



[R. TRiPARTiTus, DC. Ic. PL Gall. Ear. 15, t. 49 (1808). 

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

 Top. Bot. 10. Syme, E. B. i. 27, t 24. Nyman, 16. 



A plant without flowers or fruit, which I gathered in a small stream 

 between Bracknell and Wokingham, may belong to this species. If not, it 



