28 



ORGANOGRAPHY AND GLOSSOLOGY. 



are as long as those of the laciniae 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 lobed (f. pinnatilobatum, Ooronojnu, fig. 108), 

 or palmately lobed (f. palma tilobatam, Maple, fig. 109). 



104. Aconite. Palmtpartite leaf, 



105. Watercress. Piiinatiaeot leaf. 



lOfi. Cinq-foil. Piilmatisevt leaf. 



The leaf is lyrnte (f. 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 (f. pedatum), when 

 its lobes, segments, partitions, or laciniec diverge 



' from the base ; this occurs when three palmate 



'/7 divisions spring from the petiole, their midrib 



remaining undivided, whilst the two lateral l\ nNjUl 

 produce on each side one or two parallel VU \y 

 divisions, which are perpendicular to that NXl/ 

 from which they spring (Hellebore, fig. 111). y 



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 laciniae; the lower leaves of Herb- 

 Robert (fig. 113) are palmatisect, with trifid 

 107. strawixn-y. i^in.atisect leaf. segments and i nc i se d and toothed lacinice ; 



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

 apiculate (I. apiculatas). 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 (f. 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 (f. compositum), when its component 

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



108. Coronoim*. 

 I'cnuili)lK.-U leaf. 



