48 



FORMS OF COMPOUND LEAVES. 



An abruptly pinnate leaf (Jig. 69). When 

 the petiole of a winged leaf ends without a 

 leaflet or tendril, as in the American senna, it 

 is abruptly pinnate. 



When the leaflets of the opposite sides 

 alternate, it is alternately pinnate ; and when 

 the leaflets are alternately large and small, it 

 is interruptedly pinnate. 



When the leaflets are opposite or in pairs, 

 as in the annexed figure (69), it is oppositely 

 pinnate. J 



Fig. 69. 



ABRUPTLY PINNA1 



An unequally pinnate leaf 

 folium impari-pinnatum 

 (jig. 70). Example: the 

 she'll- bark hickory. 



When a pinnate or wing- 

 ed leuf is terminated by a 

 single leaflet, as roses, &c., 

 it is unequally pinnate, be- 

 cause the pinnce or leaflets 

 are not of an even or equal 

 number. 



When the leaflets are cut 

 in fine divaricated segments, 

 embracing the footstalk, we 

 have the verticillato-pinnate 

 leaf. 



The lyrato -pinnate, " in a 

 lyrate manner, having the 

 terminal leaflet largest, and 

 the rest gradually smaller, 

 as they approach the base, 

 like Erysimum prcecox^anL], 

 with intermediate smaller leaflets, Geum rivale ; also, the com- 

 mon turnip. 



" Such leaves are usually denominated lyrate in common with 

 those properly so called (whose shape is simple, and not formed 

 of separate leaflets); nor is this from inaccuracy in botanical 

 writers. The reason is, that these t\vo kinds of leaves, however 



Fig. 70. UNEQUALLY PINNATE. 



