150 



FORM OB FIGURE. 



149 147 148 



Palmate-veined leaves. 147, Menispermum Canaclense. 148, Passiflora cerulea. 149, Brous- 

 sonetia papyrifera. 150, Oak geranium. 



Leaves are polmatdy cleft and palmately parted, according to the 

 depth of the incisions as above described. But the most peculiar modi- 

 fication is 



273. THE PEDATE, like a bird's foot, 

 having the lowest pair of veinlets enlarged, 

 recurved, arid bearing each several of the 

 segments (148). 



274. THE FORMS OF THE PARALLEL- 

 VEINED LEAVES are remarkable for their 

 even, flowing outlines, diversified solely 

 by the direction and curvature of the veins. 

 When the veins are straight the most com- 

 mon form is 



275. THE LINEAR, long and narrow, with 

 parallel margins, like the leaves of the 

 grasses a form which may also occur in 

 the pinnate-veined leaf, when the veinlets 

 are all equally shortened. The ensiform, 

 or sword-shaped, is also linear, but has its 

 edges vertical, that is, directed upward and 

 downward. 



276. IF THE VEINS CURVE, we may have 

 the lanceolate, elliptical, or even orbicular 

 forms ; and if the lower curve downward, 

 the cordate, sagittate, etc., all of which are 

 shown in the cuts. 



The palmate or radiate form is finely illustrated 

 in the palmetto and other palms, whose large, 

 fan-shaped leaves are appropriately termed flabel- 

 liform (fan-shaped). 



277. THE LEAVES OF THE PINE AND THE FIR TRIBE (Conifers) gen- 

 erally are parallel- veined also,' and remarkable for their contracted 



151, Ensiform leaves of iris. 

 152, Acerose leaves of Finns. 153, 

 Subulate leaves of Juniperus com- 

 munis. 



