10 



BRITISH FLOWERING PLANTS 



When, in a pinnate leaf, the leaflets are arranged 

 on the sides of the leaf-stalk with a terminal leaflet, 

 the leaf is called imparipinnate (fig. 57); when the 

 terminal leaflet is wanting, paripinnate (fig. 58); 



stalk ; and the clasping base, embracing a portion 

 of the stem of the plant (fig. 64). 



When the leaf-stalk is absent, the leaf is said 

 to be sessile (fig. 65). When the sessile leaf 



interruptedly pinnate when the pairs of leaflets are encloses the stem, it is called amplexicaul (fig. 66); 



^S 



alternately larger and smaller (fig. 59) ; and bi- 

 pinnate when the leaflets are themselves compound 

 (fig. 60). Other forms of compound leaves are 

 palmate-partite (fig. 61), lyrate (fig. 62), and pedate 

 (fig- 63). 



Many leaves are divided into three principal 

 parts : the lamina, or surface of the leaf; the foot- 



and when the stem grows through it, it is said to 

 be perfoliate (fig. 67). Sometimes small leaves 

 are formed near the base of the leaf-stalk. These 

 are called stipules, and the leaf is then said to be 

 stipulate (figs. 68-71). 



Occasionally, as in the Plantains, there is a 

 "rosette" of leaves close to the ground (fig. 72); 



