THE COMPOUND LEAF. 



103 



also its peculiar forms of compound leaves, as ternate, quinate, 

 septinate, etc., according to the number of leaflets which arise 

 together from the summit of the petiole. Ternate leaves of this 

 venation are to be carefully distinguished from those of the 

 pinnate plan. The palmately ternate leaf consists of three leaf- 

 lets, which are either all sessile or stalked alike ; the pinnately 

 tei nate has the terminal leaflet raised above the other two on 

 tho prolonged rachis (354, 355). 



366 y ^365 [ 364 



363, Lemon. 361, Jeffersonia. 365, Potentilla anserina. 366, P. tridentatn. 



307. Apex. In regard to the termination of a leaf or leaflet 

 at its apex, it may be acuminate, ending with a long, tapering 

 point ; cuspidate, abruptly contracted to a sharp, slender point ; 

 m-iicronate, tipped with a spiny point ; acute, simply ending with 

 an angle ; obtuse, rounded at the point. Or the leaf may end 



367-375, Apex of leaven, o, obcordate; 6, emarginate; c, retuse; d, truncate; e, obtuse: /, acute; p, 

 mncronate; A, cuspidate; k, acuminate. 

 376-380, Boxes of leaves. L, hastate; in, n, sagittate; o, auriculata; p, cordate; ?, reniform. 



without a point, being truncate, as if cut square off; retuse, 

 with a rounded end slightly depressed where the point should 

 be ; emarginate, having a small notch at the end ; obcordate, 

 inversely heart-shaped, having a deep indentation at the end. 

 308. Margin. The following terms are used to define the 



