38 EXPLANATION OF THE ORDERS 



Polymnia, Parthenium, Chrysogonum, and Baltimora, 

 are nearly all that appertain to this curious order in 

 the United States. 



In the fifth order, Segregata, which is essentially- 

 only a modification of the first, there is, besides the 

 general calyx or involucrum of the whole family, par- 

 tial or included calyces, each containing one or more 

 florets, which in Echinops and Elephantopus are 

 perfect, as in iEojJALis, and tubular, as in the section 

 fiosculosce. This order approaches in some degree 

 the aggregate flowers, such as the Teasel and Scabi- 

 ous, but is at once distinguished as Syngenesious, by 

 the characteristic union of the anthers. 



The sixth order, now very properly abolished, was 

 termed Monogamia, because it contained plants with 

 simple, instead of compound or polygamous flowers; but 

 the plants referred to it were completely at variance 

 with all the rest of the class ; such were the Violet 

 and Balsam, in which, indeed, no proper union of the 

 anthers takes place. 



In the three following classes, Gynandria, Mo- 

 n(ecia, and Dkecia, the orders are founded upon the 

 number and disposition of the stamens, and bear the 

 same names as the foregoing classes, as Gynandria 

 Monandria; and so on. 



The class Polygamia, now generally laid aside, 

 was divided into three orders ; viz. Moncecia, when 

 perfect and imperfect flowers existed on the same 

 plant (as may be seen in some Maples) ; Dicecia (as 

 in the Ash), when perfect flowers are found on one 

 plant, and imperfect ones on a second individual of 

 the same species ; and Triogcia, when perfect flow- 

 ers exist on one plant, staminiferous ones on a second, 

 and pistilliferous flowers on a third individual of the 

 same species ; of which singular and very uncommon 

 disposition, the common Fig is given as an example ; 



