THE DICOTYLEDONES 



1953 



Fig. 1884. — Ambrosia artemisiaefoUa. Ragweed. Flowering 



shoot. 



The plants are herbaceous, occurring mainly in Mexico and the 

 Pacific coast of North America. Several species are cultivated 

 in gardens. Tagetes erecta is the African Marigold. 



Anthemideae. Capitulum heterogamous or rarely homogamous, with 

 female or sterile ray florets and fertile or sterile disc florets. 

 Corolla of disc flowers regular, with five or rarely four short 

 lobes. Involucral bracts with membranous tip and edges. 

 Anthers usually rounded at the base, with basifixed filaments. 

 Style with long hairs above the fork. Pappus absent or reduced 

 to a ring or cup. Achillea, Atithetnis, Chrysanthemum, Matricaria, 

 Artemisia, Tanacetum. 



The plants are generally herbaceous but occasionally shrubby, with 

 alternate, pinnate leaves. Many are found in Britain and on the 

 whole the tribe is more widely distributed in the Old World than 

 in the New. 



The tribe is divided into two sections, the Anthemidineae in which 

 there are floral bracts on the receptacle and the Chrysanthemi- 



