SYNGENESIA. 453 



* 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, 973, 1230; Tanacetum, 

 t. 1229; Conyza, t. 1195; and GnapliaUum, 

 t. 267, 1157- In the last the marginal flo- 

 rets are mostly 5-cleft and tubular like the 

 rest, only wanting stamens. Caution is re- 

 quisite to detect the difference between this 

 section and the preceding Order. 



** Ligulate, ^-lipped, of which Perdicium, 

 a rare exotic genus, is the only instance. 



#** Radiant, the marginal florets ligulate, 

 forming spreading conspicuous rays ; as Bel- 

 lis the Daisy, I. 424 ; Aster, t. 87, a very 

 numerous genus in America; Chrysanthemum^ 

 t. 601, 540; Inula, t. 1546, &c. This sec- 

 tion seems, at first sight, a combination of 

 the first and third sections of the former Or- 

 der, but this is chiefly in the form of its co- 

 rollas. It is rather an approach of that third 

 section towards what is equivalent to becom- 

 ing double in other tribes. Accordingly, the 

 Chamomile, A nthemis nobilis, £.980; Clirij- 

 santlicmum Leucanthemum, t. 601 : and 



