526 CONSERVATIVE ORGANS. [LECT. X. 



there are secondary petioles, supporting ternary, 

 which are pinnate, it is triply pinnate (tripinna- 

 tum s. triplicato-pinnatum) , as in the Carrot 

 genus, Daucus, &c. 100, (p. 525). These are the 

 only species of the decompound leaf; but the term 

 is occasionally applied to leaves which are very 

 much and irregularly divided. 



There is, however, one species of the compound 

 leaf, which we have not yet examined, because it 

 cannot properly be classed in any of the foregoing 

 divisions. It is sometimes termed vertebrated (ver- 

 tebratum), and sometimes jointed ( articulatum) . 

 It consists of several leaflets, which appear to 

 grow out of each other, or are attached one 

 upon the summit of another, with an evident 



