BUDS AND LEAVES. 



21 



their leaflets in pairs; unequally pinnate (Fig. 30) when they havo 

 tlicin in pairs sunnountod by an odd tcnuinal one. 



Hut often the division of pinnately conipound leaves is carried still 

 farther, and the phu-e of tlie leaflet is taken by another i)etiolo bearing' 

 leaflets ; the leaf is then termed bi-plnnate (Fig. lU) ; a step farther still, 

 and it becomes tri- pinnate. In these cases the primary divisions are 

 termed pinnae, the secondary pinnules, though the bladea are always 

 called leallets. 



Fig. 29.— Simple leaf of bass-wood. 



Flo. .'JO. — ComponnJ leaf of locnst {RoMnta 

 PHettdamia). Uneciimlly pinnate, the separate 

 blades (leiyleCs) beiiia in pairs, with anoild terminal 

 one. 



Palmately compound leaves are also frequently divided and subdivided 

 in like manner, and may become bi" or tri-palmate, ternate, etc. 

 Wlien the subdivision is carried to an extreme point the leaf is termed 

 decompound. 



The same terms are used in the characterization of the general oiitline 

 of compound leaves and their leaflets and the marginal features of the lat- 

 ter as are applied to simple leaves. 



