The Margin
Leaves are classified according to their margins; as—
entire, when the margin is completely filled out to an even line;
repand, or undulate, when the margin is a wavy line;
dentate, or toothed, when the teeth point outward;
crenate, or scalloped, when dentate, with the teeth rounded;
serrate, when having small sharp teeth directed forward;
incised, when cut by sharp and irregular incisions more or less deeply;
lobed, when cut not more than half-way to the midrib, and the divisions or their angles are rounded;
cleft, when cut half-way down or more, and the lobes or sinuses are narrow or acute;
parted, when the cutting reaches almost but not quite to the midrib;
divided, when the blade is cut into distinct parts, thus making the leaf compound.
All these terms may be modified by the words pinnate or palmate; thus—pinnately parted, pinnately divided, palmately parted, palmately divided, etc.; also by the adjectives once, twice, thrice, etc.