1 68 GROWTH AND WORK OF PLANTS 



stages of flowering should be separated from the disk for close 

 examination. 



268. The calyx. The calyx is very inconspicuous. The 

 ovary is inferior since the calyx is joined to its outer surface and 

 covers it. It is seen as a narrow wedge-shaped white body with 

 the rest of the flower borne on its apex. The calyx is manifest 

 here only as two small white awn-like lobes, or chaff, which are 

 opposite (sometimes there are rudiments of smaller ones 

 between). 



269. The corolla. The tubular corolla is abruptly broadened 

 or inflated near the base. The apex is divided into five short 



Fig. 124. 



Section through head of sunflower, showing details of flowering from the outside toward 

 the center. 



acute lobes which show that it is composed of five petals. Com- 

 pare this inflated portion of the corolla in tubular flowers of 

 different ages. 



270. The stamens. The stamens are joined together by the 

 edges of their anthers.* They are five in number and attached 

 by the filaments to the lower part of the inflated portion of the 

 corolla. The anthers thus form a tube which surrounds the 

 upper part of the style and the stigma. They open along their 

 inner faces, shedding the pollen on the hairy outer faces of the 

 stigma. 



* The anthers are thus syngenesious. 



