50 



FORMS OF COMPOUND LEAVES. 



A pedate leaf, with 

 compound leaflets 

 folium pedatum ; 

 foliis compositis. 



Example: I he Maid- 

 en hair Adiantum 

 pedatum. A very com- 

 mon plant in the neigh- 

 bourhood of Philadel- 

 phia. 





Fig. 73. PEDATE. 



The most singular of 

 all the various leaves, are 

 those of the pitcher plants. 

 The pitcher of the Nepen- 

 thes (74, c) is provided with 

 a perfect lid or cover, which 

 is closed in dry weather, as 

 if to prevent evaporation, 

 and open when it is rainy 

 or damp. It has been sug- 

 gested, that these pitchers 

 were designed as reservoirs 

 in which water is stored 

 for the occasional use of 

 the plant in extremely dry 

 weather. 



When the petiole be- 

 comes dilated and hollowed 

 out at its upper end, the 

 lamina being articulated with and closing up its orifice, as in 

 Sarracenia (Jig. 74, a), and Nepenthes (Jig. 74, c), it is called 

 a pitcher, or ascidium ; if it is enclosed and is a mere sac, as in 

 Utricularia (Jig. 74, 6), it is called ampulla. 



The surface of a leaf may be ribbed or nerved, having 1 fine elevations, 

 running from one extremity to the other, without branching ; or 



Veined, having prominent divisions near the base, and finer and smaller 

 as they extend over the leaf, as in the mullein ; or 



Wrinkled, rugose, rough, or corrugated, like the leaf of the sage ; or 



Fig 74. LEAVES OF PITCHER PLANTS. 



