A8TERALES. 



513 



red flowers, which are gathered and dried, constituting the dye Saf- 

 flower. 



Centaurea odorata and C. mosehata, from Asia, and other European 

 and American species, are cultivated in flower ijardens. 



Cnicus incluiles our Thistles, most of which are weeds in fields. 



Figs 443 5.— Illustrations of Taraxacum DENs-LBONia. 



Fro. 442. 



Pio. 44.3. 



Fig. 445. 



Fig. 443.— Head of flovvers, with a bud on tll^ right, a closed fiuiting head on the 



'°Big"443.'^FIowi-r Magnifipd. Fig. 444.-Receplacle and fruits. 



Fig^ 445.— Fruit. Maijniiiid, 



C. arveniis, the so called Canada Thistle, is in reality aa Old World 

 species. It is one of the most difficult of all our weeds to eradicate on 

 account of its underground stems, which ,are tenacious of life. 

 U. lanceolatus, the Common Tliist^e, is apo^lier introduced speciep. 



