240 



Composite Silpkium. 



to it on account of its resinous exudation. There are several 

 other species, but they are rarely seen out of botanic gardens* 



15. ZINNIA. 



Handsome erect or prostrate annuals with opposite or verti- 

 cillate sessile or clasping leaves and solitary flower-heads on 



Fig. 129. Zinnia elegans. 

 ( nat. size.) 



Pig. 128. Silphium laciniatum. (J nat. size.) 



long peduncles. The ray-florets are normally five, and persistent 



