THE LEAVES. 



27 



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

 96) ; crenate (f.crenatum) when it has rounded teeth and a sharp sinus (Ground ivy, 

 fig. 87); serrate (f. 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 (f. duplicato-dentatum, &c.) when the teeth or crenatures are 

 themselves toothed or crenate (Ety, fig. 98) ; incised (f. incisum) when the teeth are 

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

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

 (Oak, fig. 100). The divisions of the leaf are 

 called lacinicB 1 (laciniw), when acute, and 

 separated by an acute sinus, which reaches 

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

 nerves are pinnate, the laciniee are so also, and 



100. Oak. Sinuate leaf. 



102. Castor-oil. Palmatifld leaf . 



101. Dandelion. 

 Pinnatifid ruiiciuate leaf. 



103. Poppy. 

 Pinnatipartite leaf. 



the leaf is pinnatifid (f. pinnatifidum, Artichoke) ; if palmate, so also are the 

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

 leaf of which the lacinise point downwards, is called runcinate (f. 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 or the base of the blade ; 

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

 fig. 103), or palmatipartite (f. 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, fig. 105) or palmatisect (f. palmatisectum, Cinq-foil, fig. 

 106 ; 2 Strawberry, fig. 107). The divisions are termed lobes (lobi) when the sinuses 



1 There are no current exact equivalents for the 

 substantive terms laoinies, partitions, segments, and lobes 

 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. 



2 The Strawberry and Cinq-foil have undoubted 

 compound leaves. ED. 



