FIELDBOOK OF ILLINOIS WILD FLOWERS 
a b C 
e f 
Fig. 3.—TuHE sHAPES OF LEAVES. a.—Lanceolate. b.—Ovate. 
c.—Heart-shaped or cordate. d.—Linear. e.—Oblong. f.—Oval. 
the stipular lines, which are helpful in identifying certain kinds 
of plants. Sometimes the petiole is lacking and the blade is 
9 
