THE DICOTYLEDONES 



1949 



Fig. 1880. — Taraxacum. A, Vertical sectionof a capitulum showing 

 the flattened receptacle and the bracts of the surrounding 

 involucre. B, Single floret showing the inferior ovary, pappus 

 hairs, strap-shaped corolla and stamens with anthers closely 

 surrounding the style, which terminates in two stigmatic 

 lobes. 



The calyx is either absent or is represented merely by a ring of minute 

 teeth or by a pappus borne on top of the ovary. 



The corolla is gamopetalous and may be either tubular, ligular or 

 labiate and is valvate in aestivation. 



O 



Fig. 1 88 1. — Horal diagram ot 

 Carduiis crispus. Compositae. 

 (After Eichler.) 



The androecium consists of five stamens which are epipetalous and 

 syngenesious, i.e., the anthers are fused together laterally to form a tube. 

 The anthers are bilocular and dehisce introrsely by longitudinal slits. 



The gynoecium is bicarpellary and syncarpous, the style is filiform or 

 slender and the stigma is bifid. The ovary is inferior and unilocular, con- 

 taining a single anatropous ovule with basal placentation. 



The fruit is a cypsela. The pappus when present may be sessile or may 



