72 



COLLEGE BOTANY 



compound (Fig. 53), in which, the leaflets are attached at vari- 

 ous points along the petiole from base to tip, and the palmately 

 compound (Fig. 54), in which the leaflets are attached at the 

 tip of a common petiole. 



The simple leaves are variously designated as cordate or 

 heart-shaped, curieate or wedge-shaped, deltoid or delta-shaped, 

 elliptical or ellipse-shaped, hastate or halberd-shaped, lanceolate 



FIG. 51. Palmately veined leaf. 



FIG. 52. Palmately veined leaf. 



or lance-shaped, orbicular or circular, oval or egg-shaped, reni- 

 form or kidney-shaped and sagittate or arrow-shaped. The mar- 

 gins of the leaf may usually be described as entire or smooth, 

 serrate or saw-toothed, dentate or toothed, or lobed. All grada- 

 tions may be found from the slightly lobed, through, the more 

 deeply lobed to the compound leaves. 



Functions of Leaves. The most important function of the 

 leaf is the making of carbohydrates, which is the first step in 



