162 



OEGANOGEAPHY. 



leaf (see p. 149). Its separate leaflets are subject to similar 

 modifications of margin, incision, apex, outline, form, &c., as 

 the blade of simple leaves, and similar terms are accordingly 



Fig. 332. 



Fig. 331. 



Fig. 333. 



pig. 331. Impari-pinnate or unequally pinnate leaf of Rdbinia. Fig.zZ2. 



iSqually or abruptly pinnate leaf. Fig. 333. Interruptedly pinnate 



leaf of the Potato {Solanum tuberosum). Fig. 334. Lyrately pinnate 



leaf. 



used in describing them. We have therefore only now to speak 

 of compound leaves as a whole, and the terms which are used in 

 describing their various modifications. We divide them into two 

 lieads ; namely, 1 . Pinnately or feather-veined Compound leaves, 

 and 2. Talmatdy or radiated-veined Compound leaves. 



1, Pinnately- veined Compound Leaves. — When a leaf present- 

 ing this kind of venation is separated into distinct portions or 

 leaflets, it is tevm.edi pinnate {fig. 331). The leaflets {ov pinncB 

 as they are then called) are arranged along the sides of the 

 lachis or common petiole in pairs, and according to their 

 number, the leaf is said to be unijugate or one-paired, as in 

 Lathyrus sylvestris and latifoHus, bijugate or two-paired, trijugate 

 or three-paired, and multijugate or many-paired (Jig. 331). 

 Several kinds of pinnate leaves have been distinguished. Thus 

 when a pinnate leaf ends in a single leaflet {fig. 331), as in 

 the Eiose and Elder, it is impari-pinnate or unequally pinnate, or 

 ith an odd leaflet ; it is equally or abruptly pinnate, or 



