chapter_6 - Stems Outline • • • • • • • •...

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Stems
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Outline External Parts of a Stem Stem Origin and Development Stem Structure Herbaceous Dicot Stems Woody Dicot Stems Monocot Stems Specialized Stems Wood
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External Parts of a Stem Woody twig Axis Leaves - Alternate, opposite, or whorled - Nodes Internodes - Blade - Petiole
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External Parts of a Stem Axil Axillary Bud Branches or flowers Terminal Bud Twig growth
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Origin and Development of Stems Apical meristem Dormant before growing season Three primary meristems develop - Protoderm (Epidermis) - Ground Meristem (Pith and Cortex) - Procambium (Primary Xylem/Phloem)
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Origin and Development of Stems Lateral meristem Band of cells between the primary xylem and primary phloem becomes vascular cambium Cork cambium arises in woody plants
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Stem Structure Steles Primary xylem, primary phloem, and pith (if present)
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Herbaceous Dicot Stems Annuals are usually herbaceous plants Most monocots Some dicots Herbaceous dicots have vascular bundles arranged in a ring
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chapter_6 - Stems Outline • • • • • • • •...

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