210 The Scottish Naturalist 



the districts visited. I have again had recourse to various 

 authorities for assistance with the more critical plants ; and to 

 these gentlemen, I now tender my thanks for their valuable help. 

 The following abbreviations are used : . 



U Unst. S Scalloway. 



* believed new to Britain. 



| not recorded for the county in " Top. Bot." Ed. 

 II., or in Bennett's " Additional Records," un- 

 less with some form of query. 



Ranunculus Flammula L. var. radicans Nolte. The 



extreme form of this plant from Littlesetter Loch, Yell, has, in 

 cultivation, reverted at once to typical Flammula (Cf. 'Journ. 

 Bot.' 1887, p. 370). 



Caltha palustris L. var. zetlandica Beeby (Scott Nat 

 1887, p. 21). This plant seems to pass gradually from forms in 

 which the leaves are roundish and almost entire, into forms which 

 can scarcely be separated from G. radicans Forst. On the other 

 hand, I found this year, by the upper end of the Loch of Cliff, 

 Unst, large erect forms of C. palustris, which did not root at the 

 nodes of the flower-stems, but in which the leaves were exactly 

 similar to those of C. radicans Forst ; thus palustris and radicans 

 both seem variable in their leaf-forms and in the size of the flowers, 

 and I am disposed to think that the rooting stems afford the only 

 reliable character for the separation of the two plants ; hence, I 

 believe that zetlandica should be considered a variety, or form, of 

 r.adicans rather than of palustris. The tendency to root at the 

 nodes is inherent in the plant, and is not a temporary stale in- 

 duced by local influences, as in the case of the Ranunculus cited 

 above. I have grown the zetlandica near London, in a smallish 

 pot, the diameter of which did not admit of the stems rooting into 

 the soil; but, notwithstanding the hot, dry summer of last year, 

 every flowering stem sent out rootlets at one or two of the nodes. 



Cakile maritima Scop. var. integrifolia Hornem. This 

 also occurs at the Knabb, Lerwick ; I have not met with the 

 ordinary form. 



% Cochlearia danica L. (t. Lange.) Some very large plants 

 at the Knabb. I have not yet seen C. officinalis, except as it may 

 t>e represented in the C. alpina. The last named plant has 



