od 
190 LINNEAN SOCIETY OF LONDON. 
of all the prairie grasses ; its leaves are preferred by buffaloes and 
all domestic animals to any other—hence its common name 0 
‘buffalo grass.” These seeds ripen during the latter half of se 
e 
about ten minutes, and the turns are usually eight or nine in 
number. Above this portion is a straight, stiff, untwisted arm, 
some two inches long, set at right angles when dry, but in the same 
axis as the twisted portion when wet; having a number of very 
minute teeth, it offers resistance to the grass or wool of animals, 
which, in the straightening of the awn after being wetted, have the 
are very similar to those of 8. pennata, as described by Dr. G. H. 
arwin.— Mr. John Ball'gave the gist of his «* Contribution to the 
: ; - Pat 
with the Argentine flora, the much larger proportion of Rosace@ and 
Graminee in the former region; and a complete absence of Malva- 
