23. LEGUMINOS.E. 281 



numbers ; such an intermediate estimate to apply to the 

 species which are apparently absent fi*om the three groups 

 which constitute the province of North Isles, and yet 

 probably to be found in all or very nearly all of the other 

 counties. Notwithstanding the northern range of this 

 species, I have never seen it in the Highland valleys. 



^^- ///. A ^ai~: 255. 0N0Nis('spiN0SA,)Ze«H. 



Area 1 2 3 4 5 6^ 8^ 10 11 12 13 14^16. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Haddingtonshire and Dumbartonshire. 



Estimate of provinces 16. Estimate of counties 60. 



Latitude 50 — 56. English (?) type of distribution*. 



Agrarian region. Inferagrarian — Midagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 51 — 47. 



Native. Pascual. The present species having been 

 frequently regarded as a variety of O. arvensis, its distri- 

 bution is yet imperfectly known. In several catalogues, the 

 namQ of O. arvensis is used for the two species jointly, or 

 for either of them; and thus, in estimating their range and 

 area partly from such lists, it will happen that the present 

 species is made to appear comparatively much more rare. 

 In the London Catalogue, O. arvensis is marked as mention- 

 ed in all the twenty local Floras ; while O. spinosa is given 

 in only eleven of them. But probably this shows rather 

 the use of the names, than the true distribution of the two 

 species themselves. 



20 



