DICO T YLED ONS : CA MPANULALES. 



697 



ORDER CAMPANULALES. 

 1185. Lesson XXI. The thistle family ( Composite) . In all 



the composites, the flowers are 

 grouped (aggregated) into 

 "heads," as in the sunflower, 

 where each head is made up of 

 a great many flowers crowded 

 closely together on a widened 

 receptacle. The family is a 

 large one, and is divided into 

 several sections according to 

 the kinds of flowers and the 

 different ways in which they 

 are combined in the head. In 

 the asters there is one common 

 type illustrated in fig. 585 by 

 the Aster novcz-anglice. In the 

 aster, as is well shown in the 

 figures, the head is composed 

 of two kinds of flowers, the 

 tubular flowers and the ray 



Fig. 585- 

 Aster novae-angliae. 



' Fig. 586. 

 Head of flowers of Aster novae-angliae. 



flowers. In the tubular flowers the corolla is united to 

 form a slender tube, which is five-notched at the end, 

 representing the five petals. In the ray flowers the corolla 



