THE LEAVES. 



27" 



with a rounded sinus ; it is the slightest way in which a leaf can he cut {Chestnut, fig. 

 96) ; — crenate {/. crenatum) when it has rounded teeth and a sharp sinus {Grovrnd ivy, 

 fig. 8 7); — serrate (/. serratum) when the sinus and teeth are sharp and turned towards 

 the tip of the leaf, like the teeth of a saw {White Archangel, fig. 97) ; — doubly -dentate 

 or -crenate or -serrate (/. duplicato-dentat%m, &c.) when the teeth or crenatures are 

 themselves toothed or crenate {Ehn, fig. 98) ; — incised (/. incisum) when the teeth are 

 very unequal, and the sinus sharp and deep {Hawthorn, fig. 99) ;— sinuate (/. 

 sinuatum), when the divisions (deeper than teeth) and the sinus are large and obtuse 

 {Oah, fig. 100). The divisions of the leaf are 

 called lacinice^ {lacinim), when acute, and 

 separated by an acute sinus, which reaches 

 half-way to the middle of the blade. If the 

 nerves are pinnate, the lacinise are so also, and J 



100. Gale. Sinuate leaf. 



102. Castor-oil. Palmatifld leaf. 



101. Dandelion. 

 Pinnatifid runyiuate leaf. 



103. Poppy. 

 Pinnatipartite leaf. 



the leaf is pinnatifid (/. pinnatijidum, ArtichoTce) ; — if palmate, so also are the 

 lacinise, and the leaf is palmate {f. palmatifidum. Castor-oil, fig. 102). A pinnatifid 

 leaf of which the lacinije point downwards, is called runcinate (/. runcinatum. Dande- 

 lion, fig. 101). 



The divisions of the leaf are called 'partitions {partitiones), when the sinuses 

 extend beyond the middle, and nearly reach the midrib^r the base of the blade ; 

 according to the nervation the leaf is then pinnatipartite (/. pinnatipartitum, Poppy, 

 fig. 103), or palmatipartite {/. palmatipartitum, Aconite, fig. 104). The divisions of 

 the leaf are called segments {segmenta), when the sinuses extend to the midrib or to 

 the base of the blade; then, according to the nervation, the leaf is pinnatisect 

 {/. pinnatisectum, Watercress, &g. 105) or palmatisect {f. palmatisectum. Cinq-foil, fig. 

 106;' Strawberry, fig. 107). The divisions are termed lobes {lobi) when the sinuses 



■ There are no current exact equivalents for the 

 suhsfcantive terms lacinim, partitions, segments, and lohes 

 of this work; though when rendered into adjectives we 

 usually apply lobes to divisions which descend to or 



about the middle of the leaf, and segments to divisions 

 to or near the base. — Ed. 



= The Strawberry and Cinq-foil have undoubted 

 compound leaves. — Ed. 



