( m ) 
awn is particularly ftrong in the hordeuni 
genus, of which barley is a fpecies ; but may 
be found in a lefs degree in various other ge- 
nera, though not conftant through every fpe- 
cies ; whence it's prefence or abfence is ufed 
by Liimeus as a fpecific diftindtion. The 
corol of grafles is alfo termed a glume, and 
in reality is only a dry fkinny hufk, confifting 
of two valves. The calyx and corol mould 
be compared with a magnified drawing, and 
the natural parts looked at through a micros 
fcope ; their conftru&ion will then be under- 
flood. The divifions of the outer glume, or 
calyx, ought always to be attended to, as it 
is often made ufe of by Linneus as a mark of 
the genera. Betwixt the glumes, or corol 
and calyx of the grafles, the young botanifi 
may find himfelf perplexed ; but it mult be 
remembered that thefe parts of fructification 
are not, in general, diftin&ly defined at pre- 
fent; therefore they muft be understood jac,- 
cording as they have been diftinguiflied by 
Linneus. The inner glumes of the grafles 
are to be efteemed the corol, the outer the 
calyx. The flowers of this tribe have alfo uni- 
verfally a vifible neclary, confifting fometimes 
®f two very fmall oblong leaves, placed at the 
P 4 bafe 
