viLJ LEASES. 79 



When leaflets are arranged on the digitate plan, and are 

 but three in number, they are called ternaie, and the leaf is tri- 

 foliolate ; if five, qtiinate, the leaf being qumque-foliolate. The 

 leaflets may be twice ternate {bi-ternate) if the petiole bears 

 three secondary petioles, each of which bears three leaflets, 

 and so on. 



II. The point of a leaf or leaflet at which the midrib 



Fig. 52. Digitate Leaf. 



ends is called the apex. The point where it passes into the 

 petiole, or, if the leaf be sessile, where it is joined to the 

 stem, the base. The apex and base vary considerably in 

 outline, and attention must be paid to both in describing 

 the form of leaves. The apex, if sharp, is tenned acute; if 

 blunt or rounded, obtuse; if with a very shallow notch, 

 emargifiate ; if the notch be deep, bifid — the leaf becoming 



