344 SYNGENESIA. 



Flowers discoid, their florets all tubular, re- 

 gular, crowded and parallel, forming a surface nearly 

 flat, or exactly conical. Their colour is most generally 

 yellow, in some cases pink. Santolina, t. 341 ; and 

 Bidens, t. 1113, 1114, are genuine examples of this 

 section : Eupatorium, t. 428, and the exotic Stahe- 

 llna, 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. Polygamia superflua. Florets of the disk perfect 

 or united ; those of the margin furnished with pistils 

 only ; but all producing perfect seed. 



* Discoid, the florets of the margin being obsolete 

 or inconspicuous, from the smallness or peculiar form 

 "of the corolla; as Artemisia, Engl. Bot. t. 338, 978^ 

 1230; Tanacetum, t. 1229; Conyza, t. 1195; and 

 Gnaphalium, t. 267, 1 157. In the last the marginal 

 florets are mostly five-cleft and tubular like the rest, 

 only wanting stamens. Caution is requisite to detect 

 the difference between this section and the preceding 

 Order. 



** Ligulate, two-lipped, of which Perdicium, a 

 rare exotic genus, is the only instance. 



*** Radiant, the marginal florets ligulate, forming 

 spread ing conspicuous rays; as Bellis the Daisy, ^.424; 



