4 Pescuk Sylesive 3 expanded at the base into a 
Gflat. thin scale 2 
“ Pappas bristles of equal diameter throughout 
& Leaves entirely in a basal WE by: 
@ Body of the shone Spinulose toward the apex 3, 
@Body of the achene smooth throughout 
G Leaves partly in a basal tuft partly distributed 
along the stems 
8 Achenes flattened 
/odchenes tapering above the middle; heads 
/4 mostly in panicles; herbage soft 5° Lactuca 
foAchenes blunt, not tapering; heads in 
irregular umbels; herbage more or less 
/ prickly é. 2onchus 
—_—_ 
9 Achenes columnar or ws caceaat ~Shaped, not 
iz flattened 
/OBody of achene tapering into a beak of 
M4 equal length or longer which in time 
eens the pappus e Tragopogon 
/obBody of achene beakless 
sR Leaves oblanceolate or elliptical, nar- 
/> rowed cradually toward the base 9. Hieraciun 
1p Leaves ovate-sagittate . Prenanthes 
O | b Heads either composed of similar vlowers, the corollas of 
wiich are tubula-, equally v-lobed, rarely threadlike, the 
lobes not then apparent, or comoosed of 2 dissimilar tyres, 
those of the disc- vubular, usually 5-lobed, those of the 
a marsin strav-snapeu; juice not milky; in some cases stamin- 
ate and pis stillate lowers may be borne in different heads 
Or upon separate plants 
ga Strap-shaped ray flowers none or inconspicuous, the 
6 flowers appearing to be all tubular 
4 Involucres forming ellipsoid or -lobose burrs which 
g Clings to clothing and hair by means of their hooked 
bracts or spines 
6 Involucres (of ristillate 
i. 5 
With hooked spines, tne practs enticely coalesced to 
qw JO\ form a &£-chambered fruit in each chamber of waich 1s 
a sinrle achene 33 Aanthiun 
——. 
