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Leaves, the primary function of leaves is to produce photosynthate, the…
Leaves
External Structure
most obvious function is photosynthesis #
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petiole - the stalk that holds the blade out into the light, prevents leaves from shading each other
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leaves with no petiole are called sessile rather than petiolate 
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abscission zone has cells for cutting off a leaf when its life is over, in fall deciduous leaves release an enzyme resulting in leaves falling off
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Concepts
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leaves also provide protection, bud scales and spines #
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Other Leaf Types
Succulent leaves
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families Crassulaceae, Portulacaceae, Aizoacea,
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Leaves of Conifers
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thick cuticles, thick cell walls, considered sclerophylls
always simple, never compound, perrenial leaves that can live for years and are evergreen
three deciduous conifers - larches, bald cypress, and dawn redwood
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kranz anatomy
c4 leaf anatomy, lacks palisade parenchyma and spongy mesophyll #
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insect traps
Nepenthes, Darlingtonia, and Sarracenia
sarrencia
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Development
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Monocots
like dicots, monocot leaves are expansion of some shoot apical meristem cells
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