82 MORPHOLOGICAL BOTANY. 



When the apex of the lamina is more or less notched, it is said to be 

 emarginate. 



When the lamina arises immediately from the stem, its insertion is said 

 to be direet. 



When the lamina is attached to the stem by means of the petiole or the 

 leaf-sheath, its insertion is said to be indirect. 



When the lamina whose insertion is direct has its margins not at all 

 united except at the point where it is attached to the stem, its insertion is 

 again said to be free. 



When the lamina whose insertion is direct has its prolonged basilar lobes 

 more or less united with the stem, its insertion is again said to be adnate. 



When the lamina whose insertion is indirect is attached to the petiole or 

 the leaf-sheath by its base, its insertion is again said to be basal. 



When the lamina whose insertion is indirect is attached to the petiole 

 by a point more or less within its margins, its insertion is again said to be 

 intramarginal. 



When leaves are produced singly at each node, they are said to be 

 scattered. 



When two or more leaves are produced at the same node, they are said 

 to be polymerous. 



When scattered leaves are produced on a stem with elongated inter- 

 nodes, they are said to be alternate. 



When scattered leaves are produced on a branch of which the internodes 

 do not elongate, they are said to be fascicled. 



When two leaves are produced at ■■<■ node on opposite sides of the stem, 

 they are said to be opposite. 



When three or more leaves are so produced at a node that the distance 

 between any two adjacent leaves is equal, they are said to be verticillate. 



The angular divergence is the lateral distance between the bases of any 

 two adjacent leaves. 



Simple leaves are those which have only one lamina and never more than 

 one articulation at the base. 



Compound leaves are those which have two or more laminae or one lamina 

 and two articulations. 



Compound leaves with one lamina are said to be unifoliolate. 



Compound leaves with two or more laminae are said to be multifoliolate. 



The laminae of compound leaves are termed leaflets. 



The stalks of leaflets are termed petiolules. 



The stipules of leaflets are termed stipels. 



Pinnately compound leaves are those which have their leaflets arranged 

 laterally on a common petiole. 



