LEAVES. 



93 



That a compound leaf, in spite of the joints of the separate 

 leaflets, is really only one leaf, is shown : (1) by the absence 

 of buds in the axils of leaflets ; (2) by the arrangement of the 

 blades of the leaflets horizontally, without any twist in their 

 individual leafstalks ; (3) by the fact that their arrangement 



Fie. 76. — Pinnately Compound Leaf of Locust, T^th Spines for Stipules. 



on the midrib does not follow any of the systems of leaf 

 arrangement on the stem (§ 122). If each leaflet of a com- 

 pound lea,f should itself become compound, the result would 

 be to produce ^ twice compound leaf. Mg. 85 shows that of 

 an acacia. 



