( *34 ) 
has been removed. Tragopogon, goatVbeard, 
exhibits a fpecimen of the plumy pappus ; in 
the artichoke this part is diftinctly hairy. 
This minute circumftance refpecting the 
pappus of feeds is of great ufe in marking the 
genera, therefore mould be attended to : if it 
is expofed a little to the air to dry it will then 
be more clearly perceived of which kind the 
pappus may be efteemed. The deficiency of 
the plumy pappus in dandelion has been 
thought fufficient, by Scopoli, to make ano^- 
ther genus of it, which he has named Hedyp- 
nois. However, as Linneus has uniformly 
fhown his difapprobation of multiplying the 
genera from the fingle circumftance of an in^ 
dividual differing in any one part of fructify 
cation from it's family, it would, perhaps, be 
better to follow his method in this refpecl. 
There may be frequently found, in the com- 
pound flowers, diftindtions obvioufly marked. 
In the burdock (arctium lappa) the outer 
fcales of the calyx are hooked at the extremity 
with very lharp mining hooks. The onopor- 
don, cotton thiftle, is diftinguifhed from the 
carduus, the true thiftle, by having a recep- 
tacle fomewhat like a honeycomb, that of 
carduus being hairy ; and hence may be per^ 
ceivecl 
