LEA VES. 



[CHAP. 



with these it is not needful to burden the memory just at 

 present. 



lo. Compound leaves we shall class as we have done the 

 divided simple leaves, from which they differ in having the 

 blade divided into leaflets^ which are given off from the 

 summit of the petiole, or from the midrib (common petiole), 

 as the case may be. The leaflets separate from the petiole 

 or midrib in the same way that the entire leaf separates 

 from the stem, that is, without tearing. Sometimes it is 

 difficult to tell whether a leaf should be called simple 



Fjg. 51. Pinnate Leaf. A pair of adherent {adnnte) stipules are shown at the base ; 

 one on each side. 



or compound. Generally, however, it is plain enough. 

 Many beginners fall into the mistake of calHng leaflets leaves, 

 but a little care will rarely fail to save any one from such a 

 mistake. Compound leaves are either of the piiinate type, 

 as Rose and Tamarind, or of the digitate type, as Sterculia 

 fcefida. The Rose leaf is unequally piimate^ because there is 

 an odd leaflet at the end of the common petiole. When 

 the odd leaflet is absent, as in Tamarind, the leaf is equally 

 or abniptly pinnate. A leaf becomes twice pinnate {pi- 

 pi?i7iate) when the common petiole, instead of beanng 

 leaflets, bears secondary petioles upon which the leaflets 

 are pinnately arranged. 



