GRASS. 
189 
Tlie rest in our list of British, grasses, consisting of about 
40 genera and 120 species, belong to the Linnaean, Glass 
Triandria ; Order, Digyma. 
These it is necessary to divide into smaller 
groups, which may readily be done upon the 
following principles, dependent upon— 1st, 
the arrangement of the flowers ; 2nd, the 
form of the inflorescence. 
1st. With regard to the relation of the 
glume-scales to those of the glum el, it be- 
comes now necessary to remark that there 
is not always a pair of the former to each 
pah’ of the latter, as in this respect we find 
three points of difference, as follows : — 
a. Each glume having a single flower ; that is, 
glumel, stamens, pistil, and seed. 
b. Each glume having two flowers, or two sets of 
glumelhe, stamens, pistils, and seeds ; that is 
to say, that each bunch ( locusta ) of flowers 
consists of two florets to the single glume. 
c. Each glume possesses three or more sets of 
-> glumella;, stamens, pistils, and seeds ; or, has 
three or more florets to a single glume. 
Fig. b. 
Fig. c. 
2nd. A point of importance to be here observed, is that of the 
form of the inflorescence, as thus : each flower, or locusta of 
flowers, may be so closely set on the central column ( rachis ) 
as to form a compact head, or “ spike/’ which may have the 
