FORM OF LEAVES 



98 



--- . ' " -, 



JFml 



;-. 



."'"' 



same is said of flowers and fruits. The blade of a sessile 



leaf may partly or wholly surround the stem, when it is 



said to be clasping (Fig-. 



132). In some cases the 



leaf runs down the stem, 



forming- a wing : such 



Leaves are said to be de- 



/ 



/ 



f 



130. Digitately parted leaves of begonia. 



current (Fig. 133). When 

 opposite sessile leaves are 

 joined by their liases, they 

 are said to be connate 

 (Fig. 184). 



19G. Leaflets may have 

 one or all of these three 

 parts, but the stalks of leaflets are called petiolules and 

 the stipules of leaflets are called stipels. The leaf of the 

 garden bean has leaflets, petiolules, and stipels. 



197. The blade is usually attached to 

 the petiole by its lower edge. In pinnate- 

 veined leaves, the petiole seems to continue 

 through the leaf as a midrib (Fig. 1"_'4). 

 In some plants, however, the 

 pet Lole joins t he blade inside 

 or beyond the margin ( Pigs. 

 126, 135). Such leaves are 

 saiil to l>e peltate or shield- 

 L shaped. This mode of al i ach- 

 nieni is particularly common 

 in floating leaves (e. g., the 

 132. ciaspiB eat water lilie>) . Peltate leaves 



of u ilil aster. >< i , i 



are usually digitate- veined. 

 L98. shape. Leaves and leaflets are infinitely varial le 

 in shape. Names have been given to some of the mor< 

 definite or regular shapes. These names are b pari of the 

 language of botany. These names represent Ideal or typi- 



1,1 i omplete Lea^ ea 

 of u lllow. 



