A8TEBALES. 



51 a 



red flowers, which are gathered and dried, coDstituting tlie dye Saf- 

 flower. 



Centaurea odoratu and C. moschata, from Asia, and other Euroijean 

 and American species, are cultivated in flower jrardens. 



Cnicua includes our Thistles, most of which are weeds iu fields. 



Fras 442-5.— Illustrations of Tabaxauum Dens-leonis. 



Fio. 442. 



Fio. 44,3. 



Fig. 445. 



Fig. 443. — Head of flowore, with a bud on tiie riglit, a closed fi-uitinjj liead on tli© 

 left, and two leaves. 

 Eig. 443. — Flower. Magnifif'd, Fig. 444.— lleceptacle and fruits. 



Fig. 445.— Fruit. MagniiiL'd, 



G. a/rvensis. the so-called -Canada Thistle, is in reality an 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. 

 C. laneeolatus, the Common Thistle, is another introduced species. 



