TITLES OF THE ORDERS. C3 



Class 15. Tetradynamia. — The two orders of this class are 

 founded on a distinction in the pericarpium. In the first order, 

 Siliculosa, the pericarpium is a Silicula, little siliqua ; which 

 differs from the Siliqua in being round, and having the apex of 

 the dissepiment, which had been the style, prominent beyond 

 the valves, often so far as to be equal in length to the siliqua. 

 In the second order, Siliquosa, the pericarpium is a Siliqua, 

 which is long, and without any remarkable extension of the 

 style. 



ClaSS 16*. MONADELPHIA. 17. DlADELPHIA. 18. PoLYADEL- 



phia. The orders of these three classes are founded on the num- 

 ber of the stamina in each brotherhood, or distinct set of sta- 

 mina. The titles of the orders being the same that are used for 

 the titles of the early classes of the system, the explanation need 

 not be repeated here 



* Class 19. Syngenesia. — To understand the orders of this class, 

 we must explain what is meant by polygamy in flowers. We have 

 already treated of polygamous plants, and shown that the term 

 polygamous, as there applied, alluded to the intercommunication 

 of the male or female flowers with the bisexual ones, either upon 

 thejsame, or a distinct plant;' but in respect to flowers, the term 

 is applied to a single flower only ; for the flowers of this class 

 being compound, & poly gamy arises from the intercommunication 

 of the several fiorets in one and the same flower. Now the poly- 

 gamy of flowers, in this sense of the word, affords four cases, 

 which are the foundations of the four first orders of this class. 

 First order, Polygamia mqualjs, equal polygamy, is when all the 

 florets are bisexual. Second order, Polygamia superflua, su- 

 perfluous polygamy, when some of the florets are bisexual, and 

 others female only ; for in this case, as the fructification is per- 

 fected in the bisexual, the addition of the females is a superfluity. 

 Third order, Polygamia frustranea, frustranecus or ineffectual 

 polygamy, when some of the florets are bisexual, and others neu- 

 ter; for in this case the addition of the neuters is of no assistance 

 to the fructification. Fourth order, Polygamia necessaria. he* 



