48 EXPOSITION OF THE LINN^EAN 



they have only two Stamens), is no objection to it on 

 the score of facility or convenience. It does not pro- 

 fess to be a natural arrangement ; and if in many 

 parts it proves so, more is performed than had been 

 promised, or than could reasonably be expected. 

 The 15th and 19th Classes are perfectly natural 

 (except Cleome, badly placed in the former) ; as are, 

 more or less, several Orders, or Sections of Orders, 

 in other Classes. 



Greater technical inaccuracy occurs relative to 

 some characters, founded on connexion of parts. The 

 Stamens, or Filaments, of several Papilionaceous ge- 

 nera, referred, with their strictly natural allies, to 

 Diadelphia Decandria, are perfectly monadelphous. 

 fig. 40. We do not mean merely that their two sets 

 of Stamens are united into one at the base ; but there 

 is really no distinction of two sets, in any part of 

 their structure. Indeed if the ten Filaments are any 

 way combined, in a Papilionaceous Flower, such is 

 referred by Linnaeus to the Class and Order just 

 mentioned. If they are altogether distinct, in which 

 case their whole configuration is totally dissimilar 

 from the flat and membranous Filaments of the true 

 Diadelphia, they belong, though Papilionaceous, to 

 the 10th Class. 



Culture, and other accidents, produce changes 

 against which no principles of arrangement can pro- 

 vide. Such causes peculiarly affect number in the 

 parts of a Flower; the Stamens, and Pistils, as well 



