Fig. 59. 



34 THE LEAF. 



Fig 



Nerved, (ribbed,) Fig. 57, having small longitudi- 

 nal elevations, running from one extremity to the 

 other, without ramifications. Ex. Narrow Plantain, 

 (Plantago lanceolata.) 



Veined, Fig. 58, (venosum,) having prominent 

 divisions near the base, which as they extend 

 grow smaller, and finally spread over the leaf, 

 ramifying with each other. Ex. Pear, (Pyrus,) 

 Mullein, (Verbascum lychnitis.) 



Wrinkled, Fig. 59, (rugose,) rough, or corruga- 

 ted ; as though the veins had contracted, causing 

 the membrane to swell and sink into little inequali- 

 ties. Ex. Sage, (Salvia.) 



Plicate, Fig. 60, (plaited,) the nerves alternately 

 rising and sinking, forming the surface into ridges 

 and channels, as though the leaf had been plaited, 

 or laid in folds. Ex. White Hellebore, (Veratrum 

 viride,) Ladies' mantle, (Alchemilla vulgaris.) 



COMPOUND LEAVES. 



When several leaves or leaflets grow on a common foot 

 stalk, they are called compound. Such leaves do not fall 

 singly from the tree, but as the fall is occasioned by the sepa- 

 ration of the common foot stalk, all the leaflets forming a com- 

 pound leaf, descend at the same time. Ex. Butternut, 

 (Juglans Cinerea.) 



Give an example of a nerved leaf. Of a veined leaf. Of a wrinkled 

 eaf. Of a plicate leaf. When are leaves said to be compound ? 



Fig. 60. 



