SYNGENESIA. 345 



Aster ', t. 87, a very numerous genus in America; 

 Chrysanthemum, t. 601, 540; Inula, t. 1546, &c. 

 This section seems, at first sight, a combination of the 

 first and third sections of the former Order, but this is 

 chiefly in the form of its corollas. It is rather an ap- 

 proach of that third section towards what is equivalent 

 to becoming double in other tribes. Accordingly, the 

 Chamomile, Anthemis nobilis, t. 9bi) ; Chrysanthemum 

 Leucanthemum, t. 60 1 ; and some others, occasionally 

 have their whole disk changed to ligulate white florets, 

 destitute of stamens, and consequently abortive. Such 

 are actually called double flowers in this Class, and 

 very properly. Many exotic species so circumstanced 

 are met with in gardens. A few very strange anomalies 

 occur in this section, as already mentioned, p. 233, 

 one Sigesbeckia having but three stamens, instead of 

 five, the otherwise universal number in the Class; and 

 Tussilago hybrida, t. 430, as well as paradoxa of 

 Retzius, having distinct anthers. Nature therefore, 

 even in this most natural Class, is not quite without 

 exceptions. 



3. Polygamia 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 the rudiments of pistils 

 in their radiant florets. 



This Order is, still more evidently than the last, 

 analogous to double flowers of other Classes. Ac- 



