14–1
Parts of a Leaf
Tip
Sinus
Lobe
Blade
Vein
Midrib
Petiole or Stem
Compound and Simple Leaves
Some leaves are compound leaves; that is, they consist of a number of leaflets, which
together constitute the leaf. A good example of this is the leaf of the hickory, depicted
below. Other trees having compound leaves are the walnut and the ashes, but most trees
have simple leaves. In learning tree identification, care must be taken not to confuse an
individual leaflet from a compound leaf with a simple leaf.
Pignut Hickory
(compound leaf)
Post Oak
(simple leaf)