58 



FORM OB riGURB. 



149 14T 



Palmato-vdned leaves. 147, Menispermum Canadense. 148, Passifiora cerulea. 149, Broiia- 

 sonetia papyritiera. 150, Oak geranioin. 



Leaves are 2'0,iinaiel7/ cleft and palmatehj parted, according to the 

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

 153 151 162 fication is 



273. The pbdatb, like a bird's foot, 

 having the lowest pair of veinlets enlarged, 

 recurved, and bearing each several of the 

 segments (148). 



274. The forms op 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. Tfe 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 

 arc all equally shortened. The ensiform, 

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

 edges vertical, that is, directed upward and 

 downward. 



276. If toe veins curve, we mayhavp 

 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. 



Tho palmato or radiate form is finely illustrated 

 in the palmetto and other palms, whose large, 

 fan-shaped leaves are appropriatelj- termed flalelr 

 liform (fan-shaped). ' 



277. The leaves of the pine and the fir tp.ibe ((^oniforai) gen- 

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



151, Knsiform leaves of iris. 

 152, Ac^roKn leaves of Finns. 153, 

 Subulate leaves of Juniperus cooi- 

 mnnis. 



