230 86. GRAMINA. 



1355. Bromus commutatus, Schrad. 

 (B. racemosus, Bat. Aug.) 

 (B. arvensis, Bot. Scot.) 



Area 1 8 3 4 5 6 7 8 9 10 11 13 13 14 15 16 * (18). 



South limit in Cornwall, Isle of Wight, Kent. 



North limit in Moray, Aberdeen, Argyle. 



Estimate of provinces 16. Estimate of counties 70. 



Latitude 50 — 58 (61). British type of distribution. 



Agrarian region. Inferagrarian — Superagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to 350 or 400 yards, in East Highlands. 



Range of mean annual temperature 52 — 43. 



Native. Pratal, Agrestal. A much confused and mis- 

 named species ; greatly resembling B. mollis, but often to 

 be distinguished at a glance, by its taller growth, longer 

 pedicels, and slightly drooping or unilateral panicle ; be- 

 sides that B. mollis is usually pubescent, and B. commu- 

 tatus non-pubescent, though the contrary varieties occur 

 in each species. With very few exceptions all the British 

 localities on record for so-called B. arvensis, belong to B. 

 commutatus ; and the larger number of those on record 

 for so-called B. racemosus, may with equal correctness be 

 transferred to the present species. It is enumerated 

 among the plants of Shetland, by Edmondston ; and if 

 correctly named, the probability of its being an introduced 

 species there would seem considerable. But as yet, we 

 know its northern limit in this country very insufficiently. 

 I observed it about Castletown-of-Bi'aemar (350 yards) 

 and Dalwhinnie in Moray (400 yards), apparently native 

 at the former station, but introduced to the latter. It is 

 B. pratensis and B. arvensis of Smith, and yet the figure 



