226 Mr. AxpEnsox's List of some rare British Plants. 
Poa humilis, Flo. Brit., and subcerulea, Eng. Bot., at the Farout 
head, Durness, Sutherland ; in Anglesea, and other places. 
I am however of opinion that this is only a variety of Poa 
pratensis, as there are no permanent distinguishing characters, 
and I have observed many intermediate steps of variation 
between them, in as far.as regards their difference of habit. 
I purposely avoid taking notice of the Willows I have collected 
from various quarters, as I wish to make myself better acquainted 
with that very intricate genus before I venture to give out any 
remarks upon it; or, if I cannot succeed in establishing some 
. more satisfactory method of arranging it than hitherto has been 
effected, to remain silent. Having, however, engaged myself in 
the undertaking, I should feel obliged for such communications as 
any of the members of the Society may have it in their power to 
favour me with on the subject. 
Cs 
XIX. Some 
