RANUNCULUS 9 



folium aquaticum foliis abrotani ranunculi flore et capittilo, C. B. Pin. 141. 

 A few botanists have doubted whether Schrank's plant is identical with that 

 of Sibthorp. 



B. trichophyllus, Chaix, in Vi'l. Hist. PI. Dauph. i. 335 (1786). 



R. aquatilisj Sibth. MS. et Herb. R. capiUaceus, Thuill. Fl. Par. ed. 2, 

 278. R. paucistamineus, Tauseh, in Flora (1834), 525. Batrachium 

 trichophyllum, F. Schultz, Arch. (1847), 107. B. pantofhrix, S. F. 

 Gray, Nat. Arr. ii. 722 (1821). 



Top. Bot, 7. Syme, E. B. i. 23, t. 21. Nyman, 15. Fl. Oxf. 10. 

 Native. Lacustral. Still shallow ponds, &c. Local. P. May-July. 

 First record. Pangbourn and Streatley, Rev. W. W. Xewbould, about 

 i860. See Britten's Contr. 1871. 



1. Isis. Near Oxford, BostveU. Near Shrivenham. 



2. Ock. Little Hendred, Lomax. Abingdon, Bruce, see Rep. of Bot. 



Rec. Cluh, 1881. Near Cumnor. Pond at back of Cumnor Hurst 

 towards Besilsleigh. Marchani, rather frequent. A rather 

 different form occurs in brackish water at Marcham. Kenning- 

 ton. In a pond on the Eidgeway, over 700 feet above sea level. 

 Near Hanney. Didcot. Cholsey. 



3. Pang. Pangbourn and Streatley, Xewbould. In a pond near 



Tidmarsh. Near Basildon. 



4. Kennet. Near Theale. Near Kintbury. 



5. Loddon. Ponds at foot of Winter Hill, near Cookham, Britt. 



Contr. Wargrave, Melvill. Shinfield Green. Arborfleld. In 



ponds at Euscombe. In a pond near Shottesbrooke Church. 



Near White Walthani. In a pond between Wargrave and 



Stubbings Heath. 



R. trichoplnjllus is not likely to be confounded with any other 



Batrachian Eanunculus except R. Drouetii, from which it can usually 



be distinguished by its darker-coloured and more rigid foliage, and 



by its rather smaller and more caducous flower. R. trichophyllus, 



though widely distributed, is not very common. Besides the typical 



submerged plant, it occurs in two forms, which appear to be dependent 



upon local conditions ; namely, 



Var. TERRESTRis, Grou. & Godr. FL Fr. i. 24. ?i?. caespitosus, Thuill. 

 Fl. Par. ed. 2, i. 279. 



This form occurred in the dry summer of 1893 on the muddy margin 

 of a pond near Arborfield, and all gradations between it and the 

 tj^ical plant which occurred in the same pond could be traced. It 

 had succulent leaves and very small flowers. 



Var. HETEROPHYLLUS, Frcyu, in Fl. Exs. Austr. Hung. n. 1705. 

 The second form, which is R. trichophyllus with floating leaves, 

 occurred in the same pond at Arborfield, and has also been seen in 



