". 
132 FOUNDATIONS OF BOTANY 
Fic. 90.— Shapes of Bases of Leaves. 
1, heart-shaped (unsymmetrically) ; 2, arrow- FIG. 91.— Peltate Leaf of 
shaped ; 3, halberd-shaped. Tropzolum. 
Fic. 93. — Shapes of Margins 
of Leaves. 
a (1), finely serrate ; (2), coarsely 
serrate; (3), doubly serrate. 
b(1), finely dentate ; (2), sinuate 
Fig. 92. dentate; (3), doubly dentate. 
c, deeply sinuate. d, wavy. 
A, runcinate leaf of dandelion; B, e (1), erenate or scalloped ; (2), 
lyrate leaf. doubly crenate. 
