1; 



BOTANY. 



In a simple leaf, with radiating venation, we have lobes or clefts when 

 the incisions extend about half-way to the base, a prefix being added to 

 indicate tlie number, as three-lobed or trißd, many-lohed or 7)iidtißd, <fcc. A 

 leaf is palmate when the leaf is cleft only partly, so as to resemble a palm 

 with short fingers ; it is digitate when the divisions are deeper, and five in 

 number, like long fingers ; it is dissected when there are numerous narrow 

 ilivisions extending nearly up to the base. A pedate, or pedatifid leaf, is one 

 in which there are three primary divisions with two lateral, somewhat like the 

 foot and toes of a bird. 



In all the cases just considered the petiole is in the plane of the leaf 

 The petiole may, however, meet the leaf at an angle either right or acute. 

 When the stalk is inserted into the middle of a tolerably entire leaf, this is 

 orbicular in shape, and peltate in respect to the petiole ; the term peltate 

 is also applied to cases where the stalk is inserted within the continuous 

 margin. 



When a leaf is very narrow, with the edges parallel, as in the Pines, it is 



1 2 



18 19 



20 



21 



Various Forms: of Leaves. 



acicidar or linear {fig- !)• When the veins diverge, those in the middle 

 longest, and the margin tapering gently to either end, the leaf is lanceolate 

 {fig. 2). Should the ends be rounded, we may have a rounded { fig. 3), 

 elliptical {fig. 4), oval {fig. 5), or oblong {fig. 6) leaf When the veins at 

 the base are longest the leaf is ovate or egg-shaped {fig. 7), and obovate 

 18 



