178 Class XIX. Order I. 



Class XIX. SYtfGENESIA. Anthers united 

 into a cylinder ; flowers compound. 



Order I. JK Q UALIS. All the florets with sta- 



mens and pistiis, and all fertile. 



A. Semijloscular, all the florets ligulate. 



315. CICHORIUM. Receptacle chaffy; calyx 

 invested with scales ; seeds surrounded with nu- 

 merous short teeth. 



316. APARGIA. Receptacle naked ; calyx im- 

 bricate ; down feathery, sessile. 



317- LEONTODOX. Receptacle naked; calyx 

 imbricate, with flaccid ' scales ; down simple, pedi- 

 celled. 



318. PRENANTHES. Receptacle naked ; down 

 simple ; calyx invested with scales ; florets few, in 

 one row. 



319. LACTUCA. Receptacle naked ; down 

 simple, pedicelled ; calyx imbricate, cylindrical, 

 scarious at the margin. 



330. HIERACIUM. Receptacle naked, dotted ; 

 down simple, sessile ; calyx imbricate, ovate. 



331. SOXCHUS. Receptacle naked ; down 

 simple, sessile ; calyx imbricate, swelling at the 

 base. 



B. Flowers in heads, 



^23. ARCTIUM. Receptacle chaffy j down 



'- 



' \ 



