THE LEAF 233 
Tur Forms or LEAvVES.—SIMPLE LEAveEs are those having a 
single blade, either sessile or petiolate. 
Compounp LeAvEs are those whose blades are divided into 
two or more distinct subdivisions called /eaflets. The leaflets may 
(Drawing by 
lanceolate (3); ovate (4); elliptical (5); 
(8); spatulate (9); falcate (10); ensiform (11). 
Fic. 160.—Leaf outline: Linear (1); linear-lanceolate (2); 
orbicular (6); oblanceolate (7); cuneate 
Canis.) 
be either sessile or petiolate. If the compound leaf has leaflets 
arising from the midrib, it is called Pinnately Compound. 
The midrib of a compound leaf is sometimes called the rachis. 
If the leaflets of a compound leaf come off of the summit of the 
