29topic_12_f07

29topic_12_f07 - Topic 12 Leaves Leaf Types and...

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Topic 12 Topic 12 Leaves Leaves
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Leaf Types and Arrangements The position on the stem where a leaf originates is called a node and in the axil between the leaf and the stem is where the lateral bud originates.
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Leaf Types and Arrangements The stem like structure connecting the leaf blade to the stem is called the petiole . Not all plants have a petiole, particularly the monocots (although some do).
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Leaf Types and Arrangements Leaves are either simple or compound . Simple leaves have a single leaf blade and may or may not have a petiole. Compound leaves have more than one separate leaf like structure called a leaflet .
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Simple Leaf Simple Leaf
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Compound Leaf Compound Leaf
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Leaf Types and Arrangements Compound leaves are either palmately compound in which the leaflets originate from a single position or…………
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Palmately Compound Palmately Compound
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Palmately Compound Palmately Compound Three or more leaflets that extend from common node Once again, similar to the concept of the palm of a hand
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Leaf Types and Arrangements pinnately compound in which each leaflet originates from its own position along a central axis known as a rachis . Some leaves are doubly pinnate.
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Pinnately Compound Pinnately Compound
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Pinnately Compound Pinnately Compound Leaflets are arranged along two rows These two rows extend along the stem of the leaf Think of the shape of a feather
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Leaf Types and Arrangements Leaves are attached either singly, in pairs or more than two at a node. Leaves attached singly are called alternate .
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Alternate Leaf Arrangement Alternate Leaf Arrangement
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Alternate Leaf Arrangement Alternate Leaf Arrangement Opposite from one Opposite from one another, but not another, but not parallel parallel One leaf/bud per One leaf/bud per node node Staggered along Staggered along stem stem
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Leaf Types and Arrangements Leaves attached in pairs are opposite .
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Opposite Leaf Arrangement Opposite Leaf Arrangement
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Opposite Leaf Arrangement Opposite Leaf Arrangement Two leaves arranged Two leaves arranged on opposite sides on opposite sides of each node of each node Parallel to one Parallel to one another another
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Leaf Types and Arrangements Three or more leaves at a node is called whorled .
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Whorled Leaf Arrangement Whorled Leaf Arrangement
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Whorled Leaf Arrangement Whorled Leaf Arrangement
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Whorled Leaf Arrangement A ring of three or A ring of three or more leaf more leaf structures from structures from one node (looks one node (looks like a whorl) like a whorl) Many species of Many species of Pine exhibit this – Pine exhibit this – they have more they have more than 3 needles than 3 needles from every node. from every node.
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This note was uploaded on 04/08/2008 for the course BIO 29 taught by Professor Mcgowan during the Spring '08 term at CUNY Brooklyn.

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29topic_12_f07 - Topic 12 Leaves Leaf Types and...

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