22 41. RUBIACE^. 



Range of mean annual temperature 47 — 38. 



Native. Rupestral. Only in the upper or more northern 

 portion of the midagrarian zone ; and approximating to- 

 wards the Highland type in the character of its distribution. 

 Perhaps the estimate of counties might have been raised to 

 30, as the species is already known in 25, while Stirling, 

 Caithness, Hebrides, and some not unlikely counties of the 

 Lowlands, still remain blanks for this plant. 



526. Sherardia arvensis, Linn. 



Area 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17. 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Ross, Aberdeen, Argyle. 



Estimate of provinces 17. Estimate of counties 75. 



Latitude 50 — 58. British type of distribution. 



Agrarian region. Inferagrarian — Superagi'arian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 100 or 200 yards, in England. 



Range of mean annual temperature 52 — 46. 



Native. Agrestal, Glareal. Even this very abundant 

 English plant gradually decreases northward so far as to 

 remain um'ecorded in the Hsts of species for the three 

 groups of the North Isles; as well as being unnoticed in 

 my own lists of those obsen'ed in Caithness, Sutherland, 

 Ross, and Western Inverness. The name is marked in 

 Mr. Gordon's checked list of plants in Ross-shire ; and as 

 I noted the species at Lochearnhead, also, it is referred to 

 the Superagrarian zone, and to a temperature so low as 46. 



