SYNGENESIA. 349 



-** Ligulate, 2-Upped^ of which Perdiciumy a rare 

 exotic genus, is the only instance. 



*** Radiant^ the marginal florets ligulate, form- 

 ing spreading conspicuous rays ; as Bellis the Daisy, 

 t. 424 ; Aster^ t. 87, a very numerous genus in 

 America; Chrysanthemum, t. 60 i, 540; Inula, t. 

 1546, &c. This section seems at first sight, a com- 

 bination of the first and third sections of the former 

 Order, but this is chiefly in the form of its corollas. 

 It is rather an approach of that third section towards 

 what is equivalent to becoming double in other tribes. 

 Accordingly, the Chamomile, Anthemis nobilis, t. 980; 

 Chrysanthemum Leucanthemum, t. 601 ; and some 

 others, occasionally have their whole disk changed to 

 ligulate white florets, destitute of stamens, and con- 

 sequendy abortive. Such are called double flowers 

 in this Class, and very properly^ Many exotic spe- 

 cies so circumstanced are met with in gardens. A 

 few very strange anomalies occur in this section, as 

 already mentioned, p. 341, one Sigesbeckia having 

 but 3 stamens, instead of 5, the otherwise universal 

 number in the Class : and Tussilago hybrida, t. 430, 

 as well as paradoxa of Retzius, having distinct an- 

 thers. Nature therefore, even in this most natural 

 Class, it is not without exceptions. 



3. Polygaiuia frustranea. Florets of the disk, as in the 

 preceding, perfect or united ; those of the margin 

 neuter, or destitute of pistils as well as of stamens ; 

 only some few genera having die rudiments of pistils 

 in their radiant florets. 



