124 COUYMB1FEKJE. [Cl. 10. 



Cotula, Ethulia, Hippia, Tanacetum, Artemisia, &c. 

 some of which have minute ligulate Florets in the 

 Radius, and others approach towards the nature of 

 double Flowers, by acquiring evident Rays. 



Sect. 5. Recept. chaffy. Seed naked. Fl. usually 

 radiant. Tar chonant hits, Micropus, Anthemis, Achil- 

 lea, Euphthalmum, Siegesbeckia, &c. 



Sect. 6. Recept. chaffy. Seed toothed or scaly at 

 the crown. Fl. generally radiant. Spilanthus without, 

 and Verbesina with rays, scarcely differ otherwise; 

 Bidens and Coreopsis are in the same predicament, 

 and often vary into each other ; Silphium, Hdianthus, 

 Rudbeckia, &c. 



Sect. 7. Recept. chaffy. Seed with a feathery, hairy, 

 or bristly crown. Fl. mostly radiant. Arctotis, Tri- 

 dax, Amellus, c. 



Sect. 8 and 9 have already been explained. The 

 former is said to be monoecious, the latter dioecious, 

 which is not uniformly correct. In fact this circum- 

 stance varies. 



Mr. Brown, in a learned paper on this natural family 

 of Composite, Tr. of Linn. Soc. v. 12. 76, lays much 

 stress on the situation of the nerves, or principal ves- 

 sels, of the Corolla of the tabular Florets, which is 

 always alternate with their segments, not, as in all other 

 plants, central, or running along the middle of each 

 segment, though such do also, less universally, occur. 

 The same writer notices that the Aestivation of the 

 Florets is valvular, which is not indeed peculiar to 



