SYNGENESIA. 343 



CLASS 19- Syngenesia. Anthers united into a tube. 

 Flowers compound. Orders 5. 



This being truly a natural Class,, its Orders are 

 most of them equally so, though some are liable to 

 exceptions, as will presently be explained. 



1. Polygamia cequalis. In this each floret, taken 

 separately, is perfect or united, being furnished with 

 its own perfect stamens and pistil, and capable of 

 bringing its seed to maturity without the assistance 

 of any other floret. The Order consists of three 

 sections. 



* Florets all ligulate, or strap-shaped, called by 

 Tournefort sennflosculous. These flowers are generally 

 yellow, sometimes blue, very rarely reddish. They 

 expand in a morning, and close towards noon or in 

 cloudy weather. Their herbage is commonly milky 

 and bitter. Leontodon, Engl. Bot. t. 510; Trago- 

 pogon, t. 434, 638 ; Hicracium, t. 349, &c. ; and 

 Cichorium, t. 539, exemplify this very natural section. 



' Flowers globose, generally uniform and regular, 

 their florets all tubular, Jive-dejt, and spreading. 

 Cardans, t. 973, 976 ; Onopordum, t. 977; and Arc- 

 tium, t. 1228, well exemplify this. Car Una, t. \ 144, 

 does not so exactly agree with the above definition, 

 having a flat disk; but its affinity to the other genera 

 is indubitable. Its flattened disk and radiating coloured 

 calyx seem contrived to imitate the radiated flowers of 

 the following Order. 



