DIDYXAMIA. 435 



Lamium has the mouth toothed on each 

 side, f% 76'8, 



Prunella, t. 96 1, has forked filaments; 

 Cleonia 4 stigmas ; Prasium a pulpy coat 

 to its seeds. These instances will suffice 

 as clear examples of natural genera, di- 

 stinguished by an essential technical cha- 

 racter, in a most natural order. 



2. AngibspeVmia. Seeds in a capsule, and 

 generally very numerous. — The plants of 

 this order have the greatest possible affinity 

 with some families in Pentandria Mbhogy- 

 nia. Some species even vary from one 

 class to the other, as Bigmmia radicans, 

 Curl. Mag. i. 48.5, and Antirrhinum 

 Linaria, Engh BoL t. 658, 26*0, in which 

 the irregular corolla becomes regular, and 

 the 4 unequal stamens are changed to 5 

 equal ones; nor does this depend, as has 

 been asserted, on the action of anv extrane- 

 ous ;m>; : n upon the stigmas of the parent 

 plant, neither are the seeds always abortive. 

 No method of arrangement, natural or ar- 

 tificial, could provide against such ano- 

 malies as these, and therefore imperfections 

 must be expected in every system. 



