348 SYNGENESIA. 



na, t. 1144, does not so exactly agree with the above 

 definition, having a fiat disk ; but its afiinity to the 

 other genera is indubitable. Its flattened disk and 

 radiating coloured calyx seem contrived to imitate 

 the radiated flowers of the following Order. 



*** Floxve7's discoid, their Jlorets all tubular, regu- 

 lar ,crov.>ded an ' parallel forming a surface nearly flat ^ 

 or exactly conical. Their colour is most generally 

 yellow, in some cases, pink. Satifolina, t. 141 ; and 

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

 section : Eiipatorium, t. 428, and the exotic Staheli- 

 nay 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 (jf 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; Tanacetiim, t. 1229 ; Conyza, t. 1195 ; and 

 Gnaphalium, t. 267, 1157, In the last the marginal 

 florets are mostly 5-cleft and tubular like the rest, on- 

 ly warning stamens. Caution is requisite to detect 

 the difference between this section and the preceding 

 Order. 



