452 SYNGENESIA. 



does not so exactly agree with the above de- 

 finition, having a flat disk ; but its affinity 

 to the other genera is indubitable. Its flat- 

 tened disk and radiating coloured calyx seem 

 contrived to imitate the radiated flowers of 

 the following Order. 



*** Tlowers discoid, their florets all tu- 

 bular, regular, crowded and parallel, form- 

 ing a surface nearly flat, or exactly conical. 

 Their colour is most generally yellow, in some 

 cases |>ink. Santolina, t. 141 ; and Bidens, 

 t. 1113, 1114, are genuine examples of this 

 section : Eupatorium, t. 428, and the exotic 

 Stcehelina, Dicks. Dr. PL 13, approach to 

 the preceding one. There is however the 

 most absolute difference between these two 

 sections, collectively, and the first; while, on 

 the other hand, they have considerable af- 

 finity with some of the following Orders, as 

 will be hereafter explained. 



2. Tohigannasuperflua. Florets of the disk 

 perfect or united ; those of the margin 

 furnished with pistils only ;. but all pro- 

 ducing perfect seed. 



