LEAVES. 131 



Bipinnate (Acacia). 

 Pinnatifid (Crepis). 

 Ternate (Clover). 



Biternate (Columbine). 



DEPENDING ON POINT. 



Obtuse (Dock). 



Mucronate (Holly). 



Eetuce (Snowball). 

 Emarginate (Bladder Senna). 



At the base of many leaves are a pair of scales called 

 stipules; the petiole or leaf-stalk is generally cylindrical, but 

 frequently triangular, and in grasses it is flat and surrounds 

 the stem, this is called a sheath ; when leaves are narrow 

 and not expanded into a lamina, as in the pine tribe, they 

 are said to be "acicular." 



The stalks which bear the flowers are called " pedicels," 

 at the base of which are a pair of scales called " bracts ;" 

 when these are large and expanded, so as to enclose the 

 flowers, they are called " spathes " (this is seen in the arum), 



K 2 



