77//'; COMl'Oi'MJ Lh'AF 



191 



tlu'v arc i)iiiiiatc'ly or ])almatoly coinpouiKl. Tlic (iiu'stioii is to l)e 

 decided in aeeordaiiee with tlie i)()iiit a( wliieii disarticulation of the 

 tenniiial leaflet occurs. If ])alniate, the \):\>v of the blade must ))e the 

 point at which the three petioles separate, so that when disarticulation 

 occurs no rachis will remain extending l)ey()nd the j)oint of attachment 

 of the two lateral leaflets (Fig. 548). In the })innate form such a rachis 



Fig. .'io2. Triternate leaf. 553. Pedatetloaf (violet). 554. Pari-pinnate leaflet of Gcdilschia. 555. 

 Impari-pinnate leaf of rose. 556. Millifoliolate leaf of Achilldea 557. Interrupteilly-pinnate leaf 

 of Aqrimonia. 558. Runcinate leaf of dandelion. 559. Lyrate leaf of barbarea. 



(Fig. 549, a), although frequently very short, does exist. In the family 

 Leguminosae, the question of whether a leaf is pinnately or palmately 

 trifoliolate is of fundamental importance in classification. 



A three-parted j)almately com])ound or divided leaf is called Ternate; 

 a five-parted one Quinate, a se\en-parted one Se])tate. 



A palmatifid (or i)alinate) leaf, with very narrow di\ isions, is called 

 Pedate (Fig. 553). 



