COMPOUND LEAVES. 



521 



LECT. X.] 



arrangement of these on the petiole, pinnate 

 leaves receive different appellations. 



When all the leaflets are in pairs, and the com- 

 mon petiole, or rachis, is not terminated either by 

 a leaflet or a tendril, the leaf is termed abruptly 

 pinnate (pari-pinnatum, sen abrupti-pinnatum) , 

 88 ; but it is pinnate with a terminal or solitary 

 leaflet (impari-pinnatum, pmnatum cum impari), 

 when, there is a single leaflet at the apex of the 

 petiole, 8p, .; and the expression, with a tendril 

 (cirroswn), is added, if, instead of a leaflet, the 

 termination be a tendril, as in the Vetch tribe, 

 Vida *, 90, a. If the terminal leaflet be much 



* There is no specific term to designate a leaf, which has one 

 pair of leaflets only, on a common petiole which, extending 

 beyond them, is terminated by a solitary leaflet, as in the Kidney 

 Bean, Phaseolus vulgaris; for, although the term ternate is 

 usually applied to it, yet it cannot be regarded as ternate on ac- 



