494 ANGIOSPERMS 
The family includes a number of ornamental plants, of which 
the Cornflower (also called Bachelor’s Button), Marguerite, China 
Aster, Chrysanthemum, Cosmos, Dahlia, and English Daisy are 
familiar ones. 
In number of weeds which it includes this family surpasses all 
others. About one hundred plants of this family are classed 
Fic. 446. — The Marguer- 
ite, one of the Composites, 
showing the flowers grouped 
into a compact head and sur- 
rounded by aninvolucre. In Fic. 447. — Canada 
this composite a head con- 
tains two kinds of flowers — 
ligulate flowers, one of which 
is shown at the left, and tu- 
bular flowers, one of which is 
shown at the right of the 
Thistle, showing a horizontal 
root and an aérial stem in 
flower (x3), and also show- 
ing single fruits or achenes, 
one of which is shown with- 
out pappus and slightly en- 
heads. After Lecomte. larged. 
as weeds, although not many of them are bad weeds. The 
Canada Thistle (Fig. 447) is probably the worst weed of the 
family. It spreads rapidly by spreading roots or rootstocks 
and soon takes possession of pastures and meadows and gives 
considerable trouble in cultivated ground. On account of the 
spreading underground structures which propagate readily when 
cut into pieces, the plant is exceedingly hard to eradicate. Some 
of the other Thistles are also quite troublesome in some regions. 
