Leaf Morphology

Tell me about these…Similarities and differences

What do you know about leaves?

Types of Leaves

Parts of a Leaf Tip: terminal point of a leaf Blade: flattened green

expanded portion Margin: edge of a leaf Midrib: most prominent

central vein Lateral veins- secondary

veins in a leaf Petiole- leaf stalk that

connects blade to stem Stipules-leaf-like appendages.

They can protect the young leaf and may be modified into spines or tendrils

Compound Leaves Leaflet- 20 leaf of a

compound leaf Rachis- an extension of the

petiole bearing leaflets Petiolule- leaflet stalk Petiole- leaf stalk Lateral veins- 20 veins in a

leaf Stipules-leaf like

appendages

Compound Leaves

Palmately Compound (digitate)- no rachis

Pinnately Compound (pinnate)- rachis

Compound Leaves

More Compound Leaves

Leaf Attachment

Petiolate- blade attached by petiole

Sessile- no petiole

SHEESH! THAT’S TOUGH!Count to ten and breathe

PAIR UP, SKETCH, & LABEL!

PINNATE

SIMPLE-PETIOLATE

PALMATELY COMPOUND-DIGITATE

BIPINNATE

Are you ready for more?Let’s go!

Leaf Arrangement

Leaf Venation

Leaf Margins

Leaf Shapes

• Cordate- heart shaped

• “ob”- widest part at the base

Project due Thursday 8/22!

Label neatly10 characteristics could use less than 10

specimens!Start tonight with your leaves

YOU GUYS DID GREAT!