Lovely, Lovely Leaves.

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Presentation transcript:

Lovely, Lovely Leaves

Leaf arrangement Decussate Opposite

Leaf arrangement Alternate Basal rosette

Function and Shape

Leaf Venation Parallel venation Net venation

Petiole Sessile leaves

Axillary Buds

Simple & Compound Leaves NB. position of axillary bud

Leaf Sheath & Ligule (monocots) Intercalary meristem also important in Monocots (esp. grasses) Ligule Sheath

New Leaves Shoot apical meristem

The Epidermis

Glandular Trichomes Drosera Dionaea

Sarracenia

Basic Leaf Anatomy Xylem Bundle sheath Phloem

Mesophyll sub-stomatal chamber

Kranz Anatomy

Leaf c.s. through midrib

Leaf Abscission Abscission layer

Cotyledons Mostly storage organs

Heterophylly Leaves may be quite different (e.g., in beans, juvenile leaves are entire, while adult leave are compound)

Xerophytes Thick cuticle Sunken stomata Reduced air spaces in mesophyll (succulent) Trichomes – boundary layer humid Multiple epidermal layers

Hydrophytes Thin cuticle Lack characteristics for water conservation Leaves often lobed (underwater)

Special Features Bulbs Tendrils Plantlets Insect traps Kalanchoë

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