240 Compostte—Silphium. 
to it on aceount 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. 128. Silpbium laciniatum. (4 nat. size.) Tig. 129, Zinnia elegans, 
(} nat. size.) 
long peduncles. The ray-florets are normally five, and persistent, 
