122 



WEEDS OF THE FARM AND GARDEN 



sharp and rigid point; aristate, when the end is tipped 

 with a bristle point ; entire, when the leaf is entirely filled 

 out ; serrate, when the margin is cut with 

 sharp teeth ; dentate, when the teeth 

 point outward; crenate, leaf with round- 

 ed teeth; rcpand, when the margin of the 

 leaf forms a wavy line; incised, when the 

 margin is cut into sharp, deep, and ir- 

 regular teeth ; lobed, when the leaf is 

 Fig. 48. Lobed deeply cut. It is generally said to be 



! / C A ^ f , ac nite - lobed where the divisions do not extend 

 (Ada Hayden.) 



more than half way between the mar- 

 gin and the midrib, the divisions being more or less 

 rounded ; cleft, where the divisions extend more than half 



Fig. 49. Leaves of various types: i, undulate; 2, thistle leaf with 

 acute lobes; 3, lobed leaf of oak; 4, lyrate; 5, pinnately divided leaf; 

 6, pinnatisect. 



A leaf may be pin- 



way and are sharp; parted, where the divisions extend 



deeper, but do not reach the middle; divided, where the 



divisions extend nearly to the midrib. 



nately lobed or palmately lobed ; 



palmately cleft or pinnately cleft, 



etc. 



Some leaves, like those of pea 

 and many other plants of the 



same order, are provided with a . Fi e- 5- Radiate - veined 

 ' F leaves: 4, 5, cordate; 6, 7, kid- 



slender filiform body called a n ey; 8, peltate* 



