28 



OEGANOGEAPHY AND GLOSSOLOGY. 



are as long as those of the lacinise or partitions or segments, and when the divisions, 

 of indefinite depth, are rounded ; according to the arrangement of its nerves 

 the leaf is then said to be pinnately hied (f. pinnatilobatum, Coronopus, fig. 108), 

 or palmately lobed {/. palmatilobatum, Maple, fig. 109). 



104. Aconite. Paltnipartite leaf. 



105. Watercress. Pinnatiseot leaf. 



106. Cinq-foil. Palmatisect leaf. 



The leaf is lyrate (/, lyratum), when, being pinnati -fid, -partite, -sect, or 

 pinnately lobed, it terminates in a rounded division, much larger than the others 

 {Turnip, fig. 110) ; — pedate (/. pedatum), when 

 its lobes, segments, partitions, or lacinise diverge 



^^y from the base ; this occurs when three palmate 

 divisions spring from the petiole, their midrib 

 remaining undivided, whilst the two lateral | 

 produce on each side one or two parallel 

 divisions, which are perpendicular to that 

 from which they spring {Hellebore, fig. 111). 



The same leaf is often variously divided ; 

 thus the segments of the lower pinnatisect 

 leaves of Chelidonium (fig. 112) are lobed, 

 sinuate, crenulate, and dentate ; the lower 

 'leaves of Aconite (fig. 104) are palmi-partite, 

 with bifid or trifid partitions, and incised and 

 toothed lacinise; the lower leaves of Herb- 

 Robert (fig. 113) are palmatisect, with trifid 



107. strawberry. Palmatieect leaf, gegjjigjjtg ^^^ iucised and tOOthed kcinisB ; 



the lacinise being rounded and abruptly terminated by a small point, and said to be 

 apiculate {I. apiculatce). The Castor-oil (fig. 102), Poppy (fig, 103), Cinq-foil (fig, 

 106), and Maple (fig. 109), have toothed divisions. 



Compound leaves. — A leaf is simple (/. simplex), however deeply cut its divisions 

 may be, when these cannot be separated from each other without tearing, as in most 

 of the leaves mentioned above. It is compound (/. compositum), when its component 

 divisions can be separated without tearing; and its divisions are named leaflets 



108. Coronopus. 

 Pennilobed leaf. 



