ADDITIONAL SPECIES, ETC. 313 



12. Ranunculus tripartitus, DC. 



Area 1 ^ 3 * ^^ 6. 



South limit in Cornwall, ? 



North limit in Glamorgan, Surrey, ? 



Estimate of provinces — ? Estimate of counties — ? 



Latitude 50 — 53. English type of distribution. 



Agrarian region. Inferagrarian zone. 



Descends to the coast level. 



Ascends to 100 yards, less or more. 



Range of mean annual temperature 53 — 49. 



Native. Lacustral, Inundatal. Ascertained only in 

 three counties, as yet ; but likely enough to be discovered 

 in others. I have found it in four distinct stations in the 

 neighbourhood of Esher, in Surrey; but very sparing in 

 quantity, and limited to a few yards of ground or water in 

 each instance ; its existence and quantity being modified 

 from time to time by the state of the small drains in which 

 it has occui'red. Mr. Westcombe sent me a single exam- 

 ple which he had brought from Cornwall, and which was 

 unfortunately lost or mislaid, through its accidental ar- 

 rival at a time when I had a large quantity of foreign 

 plants under arrangement, and among the duplicates of 

 which it was supposed to have been accidentally mingled, 

 and probably sent away to some botanical correspondent 

 abroad. Mr. Babington has found the same species in 

 Pembrokeshire. No capillary-multipartite leaves have 

 been seen in the English specimens, whether found in 

 water of two feet in depth, in water of two inches in depth, 

 or on peaty gravel from which the water had evaporated ; 

 in any situation, the leaves are only tripartite, and again 

 cleft, much like the floating leaves of R. aquatilis, though 



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