LEAVES

LEAVES
STEM APICAL MERISTEM
- Originate on shoot apical meristem as bumps of
tissue called leaf primordia




• COMPOUND LEAF- Blade divided into
THE PLANT BODY: LEAVES leaflets, leaflets lack an axillary bud but
each compound leaf has a single bud at the
• FUNCTIONS OF LEAVES
base of its petiole.
- For photosynthesis (in mesophyll)
- For transpiration
- Some have specialized functions
EXTERNAL ANATOMY
• Leaves posses a blade or lamina, an edge
called the margin of the leaf, the veins
(vascular bundles), a petiole (leaf stalk), and
two appendages at the base of the petiole
called the stipules.
• Most monocots have a sheathing leaf base
• Some leaves may have a small leaf-like
structures at their base called stipules
a.) Pinnately-compound leaves: leaflets in
pairs and attached along a central rachis.




b.) Palmately-compound leaves: leaflets
attached at the same point at the end of the
LEAF TYPES petiole.
• SIMPLE LEAF-Undivided blade with a
single axillary bud at the base of its petiole.




c.) Pinnately and Palmately Trifoliate