GLOSSARY OF BOTANICAL TERMS 159 



Decussate, when each opposite pair is at 

 right angles to the pairs next above and below 

 it. (18) 



Whorled, when several spring from each 

 node, radiating from the stem as spokes do 

 from the hub of a wheel. (19) 



Alternate, when only one springs from each 

 node, and always from a different side of the 

 stem to those immediately above and below it. 

 (20) 



LEAF FORMS. 

 Simple Leaves. 



Simple Leaves consist of one piece only, 

 whether undivided or cut up into lobes or seg- 

 ments. 



Lobed, when cut more or less deeply into 

 lobes. (21) 



Pinnatifid, when the lobes are divided nearly 

 to the mid-rib, in a feather-like manner. (22) 



Divided, when the lobes divide to the mid- 

 rib, but cannot be separated from the leaf -stalk 

 without tearing the blade. (23) 



